“The customer’s complaint was too much voltage on his volt meter. tachometer reads very high When I start the engine the tach reads very high, 4000 to 5000rpm. Still in the 200 Ohm mode, measure between coil’s + and - terminals. Get the best deal for Car & Truck Tachometers from the largest online selection at eBay. 9-M diesels. Every expedition lets you enjoy the outstanding features designed into every boat we construct. 0 (2 votes) Store: AUTOT MOTOR Store US $5. Refer to chart on the next page. When the engine is off, the lead from the tach is reading 11. if you use your engine you need some other tachometer to calibrate to. pegs out at half throttle. Adjust engine trim angle for optimum performance. Original issue: Port tach would read (intermittantly) anywhere from 200-400 RPM too high. The little adjustment knob on the speed works. Tach is reading quite high. Too high a ratio, like 20 for example, would result in no needle movement, and too low a ratio, like 3 for example, would cause the. Tachometer was working normally at this point. i thought it was too high too but a tiny tach reads within 50 rpm of the faria tach and both says a little over 3000. Does it make sense that if the cable is not turning and the tach is reading. To use the tach you need some reflective tape on the crank pulley and the laser tach reads. I also noticed that after I initially turned the admustment screw, it became very loose and almost too easy to turn. 5v as a reference would have high readings with higher voltages. The boat tops out around 5400 and I know for sure the engine wasn’t revving that high. Outboard Tachometer Applications Chrysler 35 1HP, 70 HP & up 2 1968 - 1983 5 & 60 HP 20 Force 50 HP through early 1987 (A,B models) 8 1984 - 1999 Some older Force engines are 20 pole. yes gps for speed. But next time that I get to 105 oC, I'm pulling off the road. For your convenience, Wholesale Marine keeps a huge inventory of these replacement marine engine parts on hand. If it doesn't fall within the recommended range, this could indicate that your boat is outfitted with the wrong prop. Odysseus is a combination of the self-made, self-assured man and the embodiment of the standards and mores of his culture. These weak connections will cause the tach to read incorrect. PROBLEM: Tachometer and speedometer are reading far too high. Peak voltage of the ignition pulse in kilovolts is displayed. 0 volts at the battery (pretty close to fully charged, it was at 12. (The frequency is too high to allow use of the "Programmable Tach/Hourmeter". chaparralboats. The issue started last week with the tach twitching violently for a few seconds every time the car was turned on or off, but it would work normally after a few seconds (and the car was always stopped, so I couldn't tell if the speedo was affected). The Honda performance bulletin fom 2004 (same as my boat) suggested the 15 1/4 x 15 solas stainless hit 37mph at 6200. 2020 Dodge Durango R/T Sport Utility For Sale at Dave Smith Motors. The Tiny Tach updates the rpm about every 2. wires/terminals to case ground. This means that the actual engine speed is the tachometer reading multiplied by 3. I noticed that the rpm limiter was kicking in (Had a 6,000 rpm pill in the #6420 box), but the Autometer tach was reading about 4,000 rpm. Drop it down at least 2-3 inches and start from there. However, testing leads from the lighting coil per manual with a peak DC voltage adapter installed, The coil output reads about 55 VDC peak. It's the "engine" that makes the sparks. Features Love for Vintage Tachometer design. i will pull the flywheel sensor i guess and see how it all looks in there. But Barbie's suggestion about switching port and starboard is a good one. Stop wasting your time and see your internet deal now. "My tachometer reads too high( it maxes out at when I get on plan and stays there) on my 97 200hp Evinrude and I know it's not the engine. I ended up buying a whole new set a boat gauges which I'll show you here in a second to replace these. Find many great new & used options and get the best deals for Spark Plugs Engine Digital Tach Hour Meter Tachometer Gauge Motorcycle ATV at the best online prices at eBay!. design that Ross Herbert I can see what you mean when you say these guys are serious One for each foot and you could do. This forum is for comments and the exchange of information relating to Trojan Boats and boating. Observing this information enables us to make informed decisions on fuel consumption and boat performance. If your tach was reading too high, then that may be the problem. Registration is quick and easy, and we keep any information you give us. Turn on the boat and check if the tachometer receives a reading of revolutions per minute from the engine wiring. Yesterday on my 1995 21' Outrage with a 1994 Merc Offshore 225-hp 2-stroke outboard, a few minutes out of the harbor I noticed the (presumably OEM, analog) tachometer reading was unexpectedly high. 33 gear ration and 6200 rpm gave me. The boat planes really fast and tops out around 29-31 knots depending on conditions. The tach is reading @ 1600rpm too high. This Python-powered tachometer works just like the Arduino version and can detect the speed of a spinner held in front of the board's light sensor. 24 new and used 35 Foot 5th Wheel Camper cars for sale at smartmotorguide. I think the gauges are daisy chained so it shouldn't matter if there is a problem with the tach. Mine does the same thing too. Powerful single or twin-engine option delivers great acceleration and top speed, while Mercury technology ensures safe and precise handling. The readings were consistently 74 RPMs less at the photo tach than the actual tachometer. Tachometer: Set the number of cylinders and cycles, either place the capacitive sensor on a spark plug wire, or hold the instrument's antenna near the ignition system. While cruising on plane at approximately 23 kts the tachs were reading in excess of 6000 RPMs this is normally in the 3500-4,000 RPM range. The pointers sit on a "stepper" motor that is pulsed to set it to the desired position. So I guess because of this, since the tach lead has almost 12V with the key ON/engine off, thus not switching the transistor? I feel we are close!. Great Lakes Skipper has discount boat oil pressure gauges by the hundreds. Buy Runleader RL-HM005L Inductive Tachometer with Hour Meter for All Gasoline Engine ATV UTV Dirtbike Motobike Motocycle Outboards Snowmobile Pitbike PWC Marine Boat Waterproof: Tachometers - Amazon. It features an auto off feature to extend battery life. Just got red in the face! Thoughts? Clogged line? how to unclog? 2nd issue - last year on vaca, tach started reading high by about 700 rpm at 36mph. If you are using a factory tachometer, or an aftermarket tachometer that does not have shift light controls, you may still use any of the above mentioned shift lights, but you will now need an RPM Switch, an RPM Activated Module, or Playback Box. Wait 1 minute. AS detailed in previous editions, Fisho has embarked on an ambitious testing schedule which will see a range of 200hp outboards. I am not too concerned about the rate of charge but I suspect that the tachometer output might be related to the charging circuit. Looks like the rpm reading is from 700 to 1200 rpm's off depending on the speed. 1 US mpg first 35k, 50 next 31. any info would be great. 5 seconds to be too long for effective carb tuning. Key left in the 'on' position but without the engine running should not affect or add engine hours to the Faria tach/hour meter to my knowledge. All products are made in the USA. Another indicator of proper adjustment is a maximum rpm reading on a tachometer. Now it seems to work fine in idle but at cruise it seems to be reading 2100 rpms when the engine sounds (and performs) like it is doing more like 2800 rpms. They should be removed if any problems are experienced with the tach as they are usually the weak link and go bad. if you use your engine you need some other tachometer to calibrate to. Too cold of plug or the wrong electrode type can cause too cool of combustion temperature. (only adding hours when the 'hour glass' symbol is flashing. I suspect many tach's will be fine out of the box but mine was off. I felt that to be a bit high even for a D-MAX, and I suspected this could be his reading of an incorrect tach on the dashboard. The 3-blade can lift the bow too high – affecting your line of site for a few seconds while getting on plane. 5v as a reference would have high readings with higher voltages. The experience got me thinking about how reviews can influence diners, not just in terms of what we order — but as to whether or not we even go to a restaurant at all. what does your voltmeter read when the tach is reading too high?if it is reading 16v or more try turning on your running lights and/or any other load you may have that draws dc off the rectifier/battery and see if tach reads rightget back to us on voltage reading. Operation the boat is down, it is easier to accelerate from a standing start onto plane. If the WOT RPM is below the recommended RPM range of the engine, note the reading of the tachometer. If the motor is too high on heavier, slower boats you will not get enough bow lift and the boat will be slower than if the motor was a little lower. What If Your Temperature Gauge Spikes? By Tom Neale. I've never tried running the boat at a higher rpm then killing it to see what the guage does as i would imagine this can't be good for the motor. Just lucky, I guess. Compare prices for 12 Volt. The tachometer will read 1/3rd if the actual engine speed. a good tool. Both tachs are set at the 4 cyl position as any other setting and they are reading way too high. How the coil works (with points and condenser) to create a high voltage spark is covered in another article. on a rotax b box 2. You think it might be corroding a wire or connection that is affecting the tach?. If its a switch box tach there is a screw that it for the tach. 70F) in the field Value 1 field. About Beta Marine Diesel Engines Beta Marine, based in England, marinizes Kubota [Japanese] industrial diesel engines. I've never tried running the boat at a higher rpm then killing it to see what the guage does as i would imagine this can't be good for the motor. When the engine is started, the tachometer will show a probably correct reading after several seconds. The tachometer appears to read high. Reconnect the boat battery to the boat wiring system. I had a leaky boat from day one, when I mentioned it to my dealer, they said that they all leak somewhat. The trim, a gauge found only on boats, measures how high the engine is raised or lowered. (If this value is set too high, the control few seconds the boat speed will adjust on its own and settle. I have the Actisense on my current boat. This results in excessive carbon buildup and poor performance. Oil pressure gauge reading too high, or over 80 PSI while driving, especially at higher RPMs. My mechanic was actually surprised that my motor had the original regulator (about 12 years old at the time). Please try again later. , if one or two cylinders shows a big difference in comparison. Yesterday on my 1995 21' Outrage with a 1994 Merc Offshore 225-hp 2-stroke outboard, a few minutes out of the harbor I noticed the (presumably OEM, analog) tachometer reading was unexpectedly high. In this case, the idle will have to be adjusted manually to ensure that your boat continues to operate. Does anyone know how I can check this. My car is available only with an automatic gearbox - but it has “flappy gear paddles” for when you’re feeling frisky. The only thing that confused me was that I was topping out at 43mph with the tach reading 3600 - 3650. Not at the boat today but should be there to have a look tomorrow. At idle, the reading was 2000, yet I can almost guarantee the engine was turning no faster than a normal idle. I have tried the Aircraft spruce electric tachometer sold for the RV line of aircraft ,They are not waterproof and have had issues with the tachometer generator. Carry too much weight up front and you'll have to overtrim to get the bow to fly. The 15V sounds a little nonsensical, since it's not a specific voltage, but rather what the regulator setting is, which could be 15 but that sounds way too high, more like 14. If the tachometer reads too low, then the switch is selected too high. 2004 Yukon with 6. 5:1 compression ratio that required high-octane fuel. An insufficient power or ground will cause a tachometer to actually read too high. The trim, a gauge found only on boats, measures how high the engine is raised or lowered. i just put a teleflex tach on my boat and it seems to read too high of rpm. A tachometer is a good addition to any vehicle equipped with a manual transmission. They should be removed if any problems are experienced with the tach as they are usually the weak link and go bad. You suggest that the Rebel 15 3/4 x 15 might be low on rpm but the dealer thinks it might be too high. I remember those packages needing a 17" pitch prop. The top supplying country or region is China, which supply 100% of wireless motorcycle tachometer respectively. Buy Runleader RL-HM005L Inductive Tachometer with Hour Meter for All Gasoline Engine ATV UTV Dirtbike Motobike Motocycle Outboards Snowmobile Pitbike PWC Marine Boat Waterproof: Tachometers - Amazon. Mine is a three blade aluminum, diameter measures 16" and there is a hand engraving on the hub "16P Repitch". Let's start with the coil. For clarity in others reading this post – Smartcraft gauges are an option – not standard on any mercury motor. Well, I just got back from the boat. The reasons are basically simple. It came like this when I bought the boat, so thinking it was a bad tach, I put in a brand new one and still the same thing. Does this sound. Too high? Underpropping can cause carbon buildup and harm the bearings. the number of cylinders or alternator poles selected by the switch is too low, the tach will read high. Connect a primary-voltage-detecting tachometer to the paper clip. A good deal at 735 hp and below. Now when I shut it off it doesn't go to 0 just stays at about 1100, and goes to about 2000 when I start it. You can use your rpm gauge to tell if your car is idling too high. Ok, I'm cleaning out my fathers garage and I come across a Sears Dwell/Tach Meter with an analog gauge from 1970. For general, non-boating topics please use our "General Discussions" section. Have someone watch the tachometer while you wiggle the wires on the engine side. Have same 1996 mastercraft prostar 190 with 1996 LT1 engine - now the tachometer is acting up. Post Reply. Reading from Scripture. Some ignition systems are electronically noisier than others. The Red wire/terminal should not read to ground, but may show a very high reading (25M ohms or more). RE: TACH READING TOO HIGH As a tach (nondigital) gets older, they sometimes will start to jump, stick, or read incorrectly. Tachometer: Set the number of cylinders and cycles, either place the capacitive sensor on a spark plug wire, or hold the instrument's antenna near the ignition system. , but it was the first time I noticed the problem. We have the best prices on dirt bike, atv and motorcycle parts, apparel and accessories and offer excellent customer service. Turn on the boat and check if the tachometer receives a reading of revolutions per minute from the engine wiring. When I ran it with the 16 x 4, the tach shows an astonishing 9500 RPM. The motor runs great but the tach shows exactly double the actual rpm. On a boat, some of the most common types of gauges on the dashboard are the tachometer, fuel, speedometer, trim, voltmeter, oil pressure, and water temperature gauges. It came like this when I bought the boat, so thinking it was a bad tach, I put in a brand new one and still the same thing. Too high? Underpropping can cause carbon buildup and harm the bearings. Allow a few seconds for the reading to settle, until it stabilizes. This is a reasonably priced tachometer that has gathered good reviews from people who were able to use it for themselves. Why does the tachometer read high? Dear Boat Doctor, I just bought a used Catalina 36 MkII. The tachometer appears to read high. Vehicle owners can check their manuals for specifics on how high the oil pressure gauge reading should get to when running their engine at certain RPMs. I have a 1986 30hp Johnson mounted on a 16 ft. For example, 2,300 rpm at 5,000 feet produces less horsepower than 2,300 rpm at sea level because power output depends on air density. that relies on multiple satellites hundreds. Todays fuels require hotter combustion temperatures to burn the fuel properly than in the old days. If the tachometer reads to high, then the switch is selected too low. Re: Tach suddenly reading high Thank you, Mischief Managed. If it were me id seriously think about putting a new wire harness in it. i thought it was too high too but a tiny tach reads within 50 rpm of the faria tach and both says a little over 3000. Revolutions per minute refers to how many full revolutions something has made, such as an engine in your car. But Barbie's suggestion about switching port and starboard is a good one. When returning in the no wake zone to the launch it was still reading way to high, I gave it a tap with my finger and it dropped to the correct value. This boat has a theoretical hull speed of 5. eg when I am doing 4000rpm the tacho is showing - Triumph Motorcycles question or miss the boat. my tach started acting up on my last halibut trip too. Steadily it's been getting worse. Keeping a close eye on your gauges may save you some headaches later on. you will have to play with the pvs plugs on prop. 1991 2007 MerCruiser ALPHA 1 Gen 2 Sterndrive Service Idle Manual. Heading back to the harbor about 42 mph, looked at tach, it was reading close to 6000, way too high, although I don't think the over-rev alarm went off, maybe did not hear it. The hull is : a semi tunnel vee hull. (Factory default is 14. They had a dinghy for sale, but was priced too high for it's condition, I thought. 4200 is too low. Another solution is to go LED. As for the new SW tach not reading right, I have the same tach except the full sweep version, with electron ignition, and it reads right. The recent arrival of V-6 four-stroke outboards in the 200-plus hp range has created a sizeable gap. The momentary revving up is going to look similar to wheelspin (on the tach). I do know the gauge is not reading correctly, Sometimes it reads 8000 RPM and I know for sure it boat is not running that high. The tach and fuel burn functions worked at first, but the trim and fuel level functions refused to indicate. The strainer isn’t clogged and the water temperature and pressure gauges are reading normal. If you have any information regarding the Chris-Craft Stingers, please feel free to contact me. motor is just too small to make it run properly. I just got my new Crest Caliber put into the water today and I don't think they calibrated the tach. I also have the matching MerCruiser Alpha One Diesel Outdrive with a 2. Place the tachometer on the mounting base and slide the screw through the lock washer and flat washer as shown. So when I set my cruise at 3000 on the tach, the engine is only going 2850 and I get 15 knots there. In fact at the start of every year you should always photo tach your motor. At idle, the reading was 2000, yet I can almost guarantee the engine was turning no faster than a normal idle. It primarily shows the status of your alternator: a continually high reading suggests a battery that isn't taking a charge, while a low reading may mean a loose drive belt or an alternator. Have someone watch the tachometer while you wiggle the wires on the engine side. I know that on some of other Toyotas, the tach gets its signal from the ignitor and a jumpy tach on other Toyota can indicate a failing ignitor, but since I'm new to the Land Cruiser, I'm kind of confused on the LC ignitition system. Find Jeep Wranglers for Sale in Reading, PA on Oodle Classifieds. We do this by providing extremely high quality automotive service, following the theories and practices of Dr. If its a alternator tach you can get you signal from one of the rectifier leads. This is a reasonably priced tachometer that has gathered good reviews from people who were able to use it for themselves. If the carb is lean or rich, it won't pull as high an rpm reading as when it's right on. I took the boat out on a test drive at the dealer, and it seemed nice. Multifunction Hour Meter Tachometer Voltmeter with Clock 2 & 4 Stroke for Small Engine too fast pulse will lead to engine death. Boat Hour Meters How-Tos The Importance of an Hour Meter And How To Install One. that relies on multiple satellites hundreds. so after reading some of your comments and doing more research i have narrowed it down to 2: Tiny tach, and the TTOout of those 2 which one would you guys choose and why? TTO supposebly has better refresh rate but is that the only thing i gain over the tiny tach other then it being cheaper too?. I installed a hour/tach on my T8 from Sendec (via Cabelas). Plus it's nicer to walk around on a level deck, safer too. Works with 90 to 180 teeth on gear. You wrote "The tach went to over 7000 RPM's. We continue to work to deliver the functionality, durability and high quality finish that have earned our products a best-in-class reputation, worldwide. The fix for this problem is pretty easy. Don't Let It Happen To Your Boat! The same thing could happen to your boat, so keep that tide in mind! Remember, too, that if the tide is going out a boat may be left high and dry by the time your are ready to retract. The low reading tach issue is due to one or several microchips soldered on to back of cluster circuit board have either weak or cracked solder connections. The large chrome tach was too big, even for this space. Though the tachometer shows a 6,500 rpm redline, the engine was said to be capable of. a good tool. The tach slot on the distributor will take care of 'timing' the pulse to the tach. Call (440) 734-2000 for more information. How to Set the Idle for a 1992 Nissan Sentra. is reading too high. There is a tiny adjustment screw on the back allowing one to fine tune the indicated RPM's. We have the best prices on dirt bike, atv and motorcycle parts, apparel and accessories and offer excellent customer service. As mentioned last week, I’ve had countless questions about our daily schedule. Being a classic example of the quarter-liter fight from the big fours’, the GSX-R250’s tiny 49 mm bore coupled to a very short 33 mm stroke means sky-high rev capabilities, resulting in a 17000 rpm. If that doesn't work I will change sensor and clean the screen under it. Please try again later. My tach is reading incorrectly, based on the high RPMs that I'm seeing that don't line up with the impeller and horsepower curve. It has two leads on it, one red and one black, along with a selector switch for 4, 6, 8 cylinders. 2004 Yukon with 6. I had a leaky boat from day one, when I mentioned it to my dealer, they said that they all leak somewhat. Connect an inductive tachometer to the spark plug wires one at a time and compare the readings. I have taken the boat out 2 times fishing and now I find the Bank 1 indicators on the 3 bank battery charger is either bad or one of the battery for the electric motor is bad. You’re baffled. Many people have seen this behavior caused by a loose (high resistance) battery terminal. I could just opposite the wires on the two tachs. If the tachometer reads to high, then the switch is selected too low. I did nothing to the boat as far as mods. Gadgets 6 Levels of Knife Making: Easy to Complex. A couple knuckle taps later and it dropped. This device helps in tracking the number of hours the boat's engine has been running. Refer to chart on the next page. 4 next 36k miles, cleaned intake twice and polished end runners last time, Mobil Truck & SUV or Delvac. it doesn't look to bad to get at to me. It reads smooth and never is jumpy. Once there's a load on the batteries (i. is your GM tachometer reading way too high? fix it in 5 minutes with less than $5 for the single part you need!. That should result in boat speeds in the low 40's on the top end and the RPM's should then be in the 5000 to 5500 range at wide open. How or what can I do to lower my C0 levels? Any basic things from tune up should I pay some attention too?. Start your engine and throttle up to 1200 RPM. My wot is something like 3450 with light load. See more ideas about Teaching, Teaching reading and Classroom fun. If you're new to boating – or even if you’re not – it’s easy to make simple mistakes that may have serious consequences on the water. Browse our daily deals for even more savings! Free delivery and free returns on eBay Plus items!. What I've described would be more associated with erratic, high readings rather than consistent "clean" high readings. I would try the switch. Between 130 and 200 hp, there simply has been no four-stroke outboard. The engine has a high 12. I know Im supposed to max out at 5,000 rpm and yet Ive seen it go up as high as 5300 when accellerating hard from a standstill and once it is finally settled at top speed. Shouldn't your rev limiter kick in at around 6200? If your tach is correct and no limiter, you have a ton of cavitation. what are the causes of high oil pressure. The D-MAX is a "tuned by Goldfish" version of the same engine. Love for Vintage Tachometer design Most folks on the HAMB love vintage gauges, and it makes complete sense- These beautiful dials look right at you, with all their analog glory, allowing the car to talk to you face to face. Analog Guts Display GPS Velocity In This Hybrid Speedometer that our boat goes in is simply too dirty and the sensor kept on getting blocked up. Owning a “mature” boat, I would not trace the wire. I would try the switch. Signal strength can be controlled by the antenna wire. So when I set my cruise at 3000 on the tach, the engine is only going 2850 and I get 15 knots there. Subtract the previous reading, taken with the leads crossed, to. Help, Old tach problem is back to the tach. Ram Jet engine computers have analog and digital tachometer signals. It sometimes works, it didn't work so well. (The frequency is too high to allow use of the "Programmable Tach/Hourmeter". You think it might be corroding a wire or connection that is affecting the tach?. 5v as a reference would have high readings with higher voltages. "My tachometer reads too high( it maxes out at when I get on plan and stays there) on my 97 200hp Evinrude and I know it's not the engine. GlowShift’s Tinted Series Tachometer Gauge is 2 in size, can be installed to any or 8 cylinder vehicle, and reads from 0 to RPM. A poor choice above that. Stuck pressure relief valve in the pump. You can use your rpm gauge to tell if your car is idling too high. Disconnect any wire connected to tach send; Using a NEW wire, connect your tach send directly to the stator terminal of the alternator. 1996 VW Passat B4 VR6 wagon. Starboard tach never had an issue. It then jumped down to where it should be but was bouncing by 50-75 RPM. Setting switches not making good connection can cause the settings to be off Did you try swapping tachs to make sure the one reading too high worked OK on the other motor?. What is your maximum rpm reading at full throttle? How high do you have to trim the engine to achieve this speed? How many seconds does it take to plane?. The tach has markings which indicate the safe range of rotation speeds of the engine. The boat should have a prop that allows max engine RPM. Your tachometer shows revolutions of your engine crankshaft (to which the pistons are attached and which connects to the gearbox to eventually turn your drive wheels) in Revolutions Per Minute, or RPMs. AS detailed in previous editions, Fisho has embarked on an ambitious testing schedule which will see a range of 200hp outboards. this seem realistic to you guys. I will look for damaged wiring around engine as others have found. If you are experiencing this problem. The simplest way is a check on the RPM's first. I bought mine at amazon for under $30. Very comfortable ride and not too loud. A boat's fuel consumption in calm water is determined by the efficiency of its hull and propulsion system. The motor was too high but mounted as low as possible. Features Love for Vintage Tachometer design. A reading of Hi or Low may be the cause of alternator pole switch not selected correctly. This helps to lower the voltage spike at the coil's negative terminal to resemble a set of points, allowing the tachometer to read the ignition module's signal correctly. A high, steady vacuum reading is the sign of a healthy engine. So I guess because of this, since the tach lead has almost 12V with the key ON/engine off, thus not switching the transistor? I feel we are close!. This handheld tachometer has been designed to measure rotation speed in motors. These nine tips will help you keep your child’s reading and spelling lessons motivating—starting today!. I would measure the elapsed period of 4, 16 or 32 pulses (depending what speed range the lathe is in) using the PIC timer you can get an elapsed time accurate to fractions of a microsecond, even more accurate if you average the period over a number of input pulses. From there it’s point and get the reading. 7 V raised to 14. If you are experiencing this problem, perform the following: Using a voltmeter (not a test light), measure across the Red wire and Black wire coming from the tachometer while the engine is running. To get the correct RPM reading on my 2 stroke 2 cyclinder outboard motor, I tapped one of the wires from the magneto to the rectifier to use for the signal wire to the tach, and I set the ratio on the tach to 4. But yeah, I would read the tach all the time if I had one. Now we come to our check list, and determination of which major area is the problem. This helps to lower the voltage spike at the coil's negative terminal to resemble a set of points, allowing the tachometer to read the ignition module's signal correctly. OZ-USA Tach Hour Meter tachometer RPM backlit display motorcycle atv dirtbike buggy outboard mototcycle boat works with all gas powered engines Sale. Works with 90 to 180 teeth on gear. Occasionally tapping the glass face would allow it to correct. Some tachs have a 4-6-8 adjuster screw on the back and some you use certain wires. Great Lakes Skipper has tachometers for all different boat engines: outboard boat motor tachometers, inboard/outboard boat tachometers, diesel boat engine tachometers, inboard boat engine tachometers, digital tachometers, analog tachometers, and more. Engine Tune and Performance: Symptoms PDF. How the coil works (with points and condenser) to create a high voltage spark is covered in another article. When the RPMs go up the alt regulator may be allowing a higher voltage up to the max output of around 16. With an ever-expanding line of SuperCoils and all the spark plug wires, tune-up kits, and fuel injectors hot rodders have trusted and relied on for years, ACCEL is constantly developing innovative new products designed to push power, speed, and performance to match advancements in automotive technology. If it doesn’t fall within the recommended range, this could indicate that your boat is outfitted with the wrong prop. If an automobile has an analog dial, the danger of high RPMs is designated by a red marking. 2007 150 SPORT with Mercury Bigfoot FOURSTROKE: Tachometer Reading Too High Currently the boat idles in neutral at about 1,000-RPM. Still in the 200 Ohm mode, measure between coil’s + and - terminals.