2 Stroke Outboard motor is a marine propulsion system for boats. Easy start.year 1998. Two-stroke engines often have a high power-to-weight ratio, power being available in a narrow range of rotational speeds . 100 to 140 psi across the brands of 2 stroke water cooled outboards. Your 2-stroke outboard powerhead is an efficient pump. The below considers a basic two-stroke outboard motor and what to service each year. These values taken from Suzuki Repair Manual. Choke is still on. Menu. B735-2. Repair manual Evinrude/Johnson outboard 2-70 HP 2-Stroke 1995-2007 incl. This is measured in psi, or pounds per square inch, and we refer to it as the compression reading. Jet Drive. Actually for our 2 stroke outboards throttle setting is totally irrelevant for a compression test. The Kawasaki part numbers for these are: 57001-221 -Gauge-Head 57001-1159 - Hose adaptor Check it out for yourself. Leaking Head Gasket. it has no exhaust on it, and hasn't been run so it wasn't warm. Decided to do a compression test and had from 185psi to 195psi. Clymer. I also use a compression leakdown test on 2 stroke outboards. Today I was doing my semi annual maintenance. Yamaha 25, 40, 90, 115, 150, 200, 250 outboard motors - $4,200 (Grant) image 1 of 2 QR Code Link to This Post. How to do them and what the results mean for you! 2 stroke outboard compression test . Take your time and pay attention to the engine. 30 Apr 2014. High octane gas actually burns slower than low octane, as it is a more articulated (branched) molecule. A drastic change in the engine power can be noticed when the compression lowers in any cylinder. This is very important to prevent problems along the way. For a four-stroke, good results are between 180 to 210 PSI.. 2 HP thru 70 HP. About this item Specifications: Style: 225CC 4-Stroke 9HP Air-cooled Outboard Engine Stroke: Single Cylinder, Air-Cooled, 4-Stroke Bore stroke: 70mm x 51mm (2.7'' x 5.4'') Engine type: Matching air-cooled gasoline engine power Displacement: 225CC Power transmission mode: Gear transmission mode Gear position: Forward-neutral (no reverse gear, no need to shift) Compression ratio: 8.4:1 Fuel tank . it wasn't running when i got it or anything. is that te. This gauge is sold in two parts, The gauge head and the hose adaptor. This source says modern two-stroke outboards should be in the 90 to 105 psi range. If your 65 hp Johnson is running in the 100-150 psi range, this would be acceptable, and the engine should still perform well on todays fuel. Inspect fuel system including clean or replace filters. Engine compression test Ignition system test Check oil pump adjustment Remove prop/ lube prop shaft Check zincs Check engine timing Sync throttle plates . Call us! I'm looking at a bay boat with a 2001 Yamaha 150hp 2 stroke. Primary Compression Test Your 2-stroke outboard powerhead is an efficient pump. Most common causes of wet spark plug. A 2-stroke engine is simpler (no camshaft, valves or valve gear), so by extension that should make it easier to work out issues with poor performance. In a two-stroke engine, however, the steps are combined. Change engine oil and filter. Good compression in each cylinder. If the compression increases, the piston rings are at fault. And a head gasket failure is a reason why the compression gets low in the cylinders. Two-stroke outboard motors should have 100 to 120 PSI per cylinder. What should the compression on a 2001 2 stroke 70 Yamaha be? Given that they are both dead even, I . . Since most of us do not live at sea level, the actual ideal . Check that flywheel is secured to end of crankshaft. You're in the range for water cooled modern 2 strokes such as the E-TEC. Step 1. They're not expensive and you don't need the best one on the market. However, this is only an approximate estimate because you still need to run a compression test. There are 3 or 4 reports on the very first page of owners that HATE their mercury outboards. In addition, you should avoid having over 10 percent difference between your cylinders. Unfortunately, the average 125cc 2-stroke has a swept volume of about 70cc. 1965-1989 Mercury Outboard Idle Mixture Adjustment November 3, 2016 0. Do you can test the compression there. Untested or inspected. The Mercury 2.5 (Tohatsu) suffers from failure of the ignition system; its common, mine did so last year and it was only one year old. Dec 15, 2011. So, you squirt the tablespoon of engine oil, into a cylinder, that is reading low. The Mercury 2-stroke spark plugs and compression 100-hour service step begins by removing any plastic covers covering your spark plugs or ignition coils. Bond-O was the first one with the completely correct answer. I can't see any reason a 2-stroke OBM would be any different, but I'll defer to your experience for now. You should do a cylinder leak down test rather than a compression test. . Okay. play pokemon black 2 online; texaslawhelporg answer; aquarius man capricorn woman famous couples; ring blanks wholesale; service finance company payment login; gamecube common key; free movie server; cd and record player combined; Enterprise; Workplace; prizm blaster box checklist; uk doctor to canada reddit; how to become a fireworks dealer Before raising or removing an outboard engine from a boat, the following precautions should be adhered to: A - Gear Housing B - Mid Section 1. Would performing a leak down test yield better results? On gasoline engines, the throttle is a valve, which reduces the amount of air going into the cylinder.Closing the throttle reduces the amount for air sucked into the cylinder during the intakestroke.Having less air in the cylinder means that there is lower pressure at bottom dead center (BDC), so that when the piston moves 'up' and compresses the air, the maximum (or peak) pressure is . Burned valves: If the results remain the same, one of the . The main functions of internal combustion engines are: Intake. About this item Specifications: Style: 225CC 4-Stroke 9HP Air-cooled Outboard Engine Stroke: Single Cylinder, Air-Cooled, 4-Stroke Bore stroke: 70mm x 51mm (2.7'' x 5.4'') Engine type: Matching air-cooled gasoline engine power Displacement: 225CC Power transmission mode: Gear transmission mode Gear position: Forward-neutral (no reverse gear, no need to shift) Compression ratio: 8.4:1 Fuel tank . #2. A 2 cycle outboard block pulls the charge into combustion area by using ported pistons and dedicated block area. Steps to performing a compression check: Obtain a compression gauge. A compression test is still the best test for a 2-Stroke engine and should be performed before any repair service is done on a 2 stroke engine. Turn the screw in 1/4 turn (start at 1 1/2 out from lightly seated) at a time and listen to the idle. Mercury 2-Stroke Outboard Boat Motor service manuals are available for immediate download! The 300 HPDI is a 3.3 liter 76 degree block that has a 3.66 bore x 3.23 stroke, six throttle valves, and six high pressure direct injectors that push fuel at 1,000 psi. Furthermore, you should avoid having more than a 10% discrepancy between your cylinders. . But this is just a rough estimate since you should still try to check using a compression test. The lake test was good except for a mid range stumble that . 2. (214) 385-4890. I have 150 compression read more Up for sale is the Check Valve Assembly 3C7090751. This big difference in swept volume means that a valid compression test has to be done in a certain way with a particular type of gauge. Jan 3, 2010. How to Read Outboard Compression Test Results. Specifications: Material: Alloy Steel & Plastics & Rubber Color: As The Picture Shown Function: Compression Gauge Test Set For Engine Cylinders Diagnostic Tester Adapters For a Wide Number Of Vehicles: Spark Plug Types/Depths 3"Gauge Has Dual Color Scale With: 0-300 Psi, 0-20 Kpa Fittings: M10, M12, M14, M18 (Male, With "O" Ring) Package Includes: 1 x Cylinder Pressure Gauge 1 x Long Pipe 2 x . Everybody hears about performing an outboard motor compression test, and everyone knows that when you buy a used boat, you should compression test the outboa. Compression testing a two stroke tells you very little about the state of the engine. Crank the engine, two revolutions or so to spread the oil, then retest the cylinder. #2. Step #2: Remove the spark plugs. Remove Propeller & Inspect propeller and shaft for damage and straightness. (2) 40 ELPTO 2 Stroke: #1: 3 cylinder 1998 running parts motor may be refurbished no lower. What is the compression for a 1974 Johnson 65 hp outboard? #2. More Info At dirtrider.net Visit site Then turn out 1/4 turn at a time stopping for 10-20 seconds each 1/4 turn to allow the idle to settle. By Kelley Fager. Re: Compression question - 50hp 2 stroke. The motor has power tilt and trim and is also oil injected, 3 Cylinder.A compression test was performed with all cylinders between 115-120lbs which is about perfect for this model. Diagnostic scan (if applicable) Remove spark plugs, inspect & compression test. In the early 1970's, when you could still get good gasoline, outboard compression in the 180-190 psi range was common. For a four-stroke, good results are between 180 to 210 PSI. Aug 20, 2011. Remember that if your engine is cold, the results will be slightly lower. variation of 15 psi. Mercury optimax 150 HP 2 stroke engine with controls. I have a 2001 23' regulator powered with twin 150h.p.2 stroke yamaha outboards.i plan to re power the boat with twin 150 h.p.4 stroke Yamaha . $2200 Mercury 25 hp 25" 2 Stroke Outboard Engine Motor Fleet Maintained Running $1200 Mercury Vintage 50 hp good Powerhead n Lower $800 The spark gets very weak, it can be seen but it is not regular and too weak when under pressure. How to Compression Test on Mercury 2-Stroke Outboard Engine November 17, 2016 2. do NOT contact me with unsolicited services or offers. Remove all spark plugs. Belt and pulley inspection. Performing the Leak Down Test . In a trailer. Check the service manual on your outboard for the precise specifications. yet the compression was good and the leakage rate above 70%. 3. Good evening, I have a 1991 Yamaha 200hp. Remove the air system Open the air filter cover and remove the air filter. Tweet. Top 2 cylinders on same side will not run. A small air pump is used to pressurize the cavity to 5psi and the pressure is monitored in the cavity for around five minutes. To perform the wet test, a tablespoon of engine oil, is poured into the cylinder, through the spark plug hole. Re: 2007 Yamaha 70hp 2 stroke compression. My compression results were all in the 90psi range for all 6 cylinders. it was pushing 90psi. The Mityvac 5530 is a multi-piece compression testing kit that the company says it designed to work on virtually any gasoline engine. The cylinder head is the metal "cap" on top of the engine and is recognizable because the spark plug (s) protrude through this piece. That porting acts sort of like a duration camshaft and that is why the 80's Mercury outboards produced a phenomenal amount of power for their displacement. Compression test showed 115 in first cylinder 118 in second cylinder and 115 in third cylinder. Air and fuel mixture is drawn into the cylinder. They dont 'suck' the mixture (at least not much) like a 4 stroke: the suction part takes place in the crankcase as the piston rises; as it comes down again it compresses it and forces it in to the cylinder when the ports open. 2005 Yamaha 25hp 2 stroke outboard. Probably the best way to tell is take the boat/motor out to the lake/river and run it for an hour or 2, all RPM's, idle, wide open, listen to the motor, look it over carefully,check the spark plugs, if it runs good, sounds good and looks good, then it's most likely in good shape . The piston compresses and the air/fuel mixture is put under pressure. Be sure to lay the spark plugs in numbered order to reinsert or replace them after the test. 1. A leak down test works by pressurizing the crankcase cavity and cylinder. Common causes of a wet 2 stroke spark plug include, but are not limited to: Low compression. #2: 3 cylinder 2001 cold compression test 120-130psi. Bond-O was the first one with the completely correct answer. I have never heard of performing a cylinder leak down test on a 2 stroke engine. What Outboard Compression Test Results Mean. Aug 11, 2014. Blown head gasket. Messages. Once compression has been verified, test the ignition system with an air gap spark tester and then finally focus your attention on the fuel system. like this has been a complete project. But that's it. Recommended Tester - https://amzn.to/2MGZl4pHow to do a compression test on a 2 stroke outboard motor.-----Ignore:Tips . This is critical for avoiding difficulties along the road. Hold it at no throttle, half throttle, full throttle, doesn't matter. As earlier stated, you can purchase a compression gauge at most any auto parts store for about 30 dollars, give or take. 1) Open the throttle fully. Only show this user . It's the ratio between the volume when the piston is down and when the piston is up. 2 stroke. Incorrect fuel. Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke. With too much heat, the engine block and cylinder tend to expand a lot-causing a head gasket failure. It's the ratio between the volume when the piston is down and when the piston is up. This service is available for only $4.95 per download! Primary Compression Test. Jetting too rich. Customer Service. . This may fit other sizes and years. 1996-2006 Yamaha 115HP (115 HP) Outboard Won't Start November 3, 2016 0. i did a compression test with it, keep in mind i've never heard this thing run or anything. on a 4 stroke it is a teat on a boar hog. 2) Use kick starter to rotate motor until the compressionneedle stops rising. Messages. 2. 517. Used 2002 Yamaha 50TLRA 2-Stroke Outboard Motor. I did the test cold with both plugs out and again with only one plug out. The bike is new to me and I am not 100% sure what engine work has been done. We consider this Kawasaki gauge to be head and shoulders the very best compression gauge for use on two-stroke..especially small-bore two-strokes. I don't know a lot about this motor, we were told is had low compression only. It has a 50-amp alternator, a pair of high-speed fuel pumps, and an extremely low water intake which allows mounting on a jack plate or elevated transom bracket. Remove lower unit & gearbox oil, Inspect for water in oil and excess metal on gearbox plug. Your variation across the 6 holes is 8 psi, well within E. max. 517. Carefully look down the side of the cylinder block until you see a very fine and straight "crack" that runs completely around the block. Pre service run & inspection. The frustration comes when you can't get your oil burner to run right even after confirming adequate compression, proper carburetion and correct ignition timing. Looking for some input on compression readings as this is my first time dealing with a Yamaha outboard. - Answered by a verified Marine Mechanic . If so, it needs a new electronic ignition box. Save . Outboard 2 Stroke Service includes. Engine got flooded. Inspect all electrical components and connections. Putting some oil in the cylinder, which you can easily do on a 2 stroke (it only takes a small amount) will help the rings to seal. This compression ratio means that the outboard is designed to compress the fuel/air mixture at 6 times atmospheric pressure. 1992 40 $1500, needs carburetor clean 2003 Yamaha 50 2 stroke $2500 2002 250 OX66 running, good compression, cracked block $2000 2002 150 carbureted $5500 1992 200 carbureted $3900 Step #4: Mark the flywheel with a marker at 0, 120, and . Generally, readings below 90 PSI for modern two-stroke outboards indicate a problem; most will produce cranking compression readings in the 90 to 105 PSI range, depending on the engine year, make, and model. 11-19-2012, 04:11 PM. Aug 20, 2011. Good results for a two-stroke engine are between 110 and 130 PSI. $35.00. The crankcase must be completely sealed against pressure. Dec 15, 2011. Assuming atmospheric pressure of 14.7 psi (pounds per square inch at sea level) then the pressure in the cylinder should reach 6 times 14.7 or about 88.2 psi. Good results for a two-stroke engine are between 110 and 130 PSI. Pull on the starter rope Now pull the starter rope and see if your engine starts up. A plug is inserted into the intake manifold and another plug or block off plate is used on the exhaust to create an airtight cavity. post id: 7546597708. $1500. Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around 110-130 PSI. Worn piston rings/cylinder walls: After running the first test, squirt a teaspoon of oil into the cylinder and rotate the crankshaft six more turns. Troubleshooting in this . only one cylinder was 185, the top left the rest were 190 to 195. Leak down test are only viable options on 4 stroke engines and compression test are no longer even recommend on 4 Stroke Outboards by Yamaha or Mercury. If you have a dirty old paper copy of this manual or a PDF copy of this manual on your computer and it crashed we can help! The motor is 100% original never tampered with and only has 792 hours when removed. The oil test part of a compression test only happens if you find the compression low. Spray starter fluid into the carburetor Spray a little bit of starter fluid or carburetor cleaner directly into the air intake on the carburetor. Mercury 2-Stroke Outboard Boat Motor Service Manuals for only $4.95! DOWNLOAD Yamaha Outboard Repair Manual 1982-2011 November 8, 2016 6. Tohatsu 40 HP M40D2 2 Stroke Ignition Coil Assembly PN 3C7060400 Fits 2003. on two stroke a compression test is quick easy and painless. Lower appears good spin by hand. High octane gas actually burns slower than low octane, as it is a more articulated (branched) molecule. I cannot tell you how many 4 strokes have passed a compression test with leaking heads,leaking valves and stuck rings due to carbon. differance between cylinders 14 PSI. About this item Specifications: Style: 225CC 4-Stroke 9HP Air-cooled Outboard Engine Stroke: Single Cylinder, Air-Cooled, 4-Stroke Bore stroke: 70mm x 51mm (2.7'' x 5.4'') Engine type: Matching air-cooled gasoline engine power Displacement: 225CC Power transmission mode: Gear transmission mode Gear position: Forward-neutral (no reverse gear, no need to shift) Compression ratio: 8.4:1 Fuel tank . 4.3 MerCruiser Overheating (4.3L MPI Alpha and . So if that helps, then you know that the rings are most likely the problem. This allows the combustion process to happen in two steps (strokes) instead of four ( source ). The results shown below indicate the particular area that needs attention. Inside a compact hard black case, you'll find a 2.75-inch . Generally, two-stroke outboard motors should have a 100 up to 120 PSI compression per cylinder. On a 2 stroke engine, a compression check is sufficient. The crankcase must be completely sealed against pressure created upon the down stroke of the piston and the vacuum that's created when the cylinders piston moves upward back to TDC (top dead center). Parting out a 2003 Tohatsu 115 hp outboard. Compression should be taken when cranking with tkrottle in full throttle position. Compression should be 185-242 PSI, max. Step #1: Begin by carefully removing the top cowling, Then, remove the ignition coil cover at the rear of the motor. I have replaced the sparkplugs, I have replaced coils, I even swapped power packs. pump,check values rebuilt the fuel pump,all new fuel filters,fuel bulb and line,new plugs,rebuilt the carbs did a compression test,marked the prop to see for a spun prop,no clogged exhaust ports still having issues trying to get up to speed at 1800 rpms you can feel the motor shake and run rough but . . Use a fan to keep temps in check. Locate the joint between the cylinder head and the cylinder block. Stop at 1/2 turn out. Hello, new to this forum and to Yamaha outboards. Here is everything that you need to know about outboard compression tests. However if you watch the end my video below you will see that my 1979 Evinrude 6 Hp cranks easily cold ( 2 pulls) with 60 psi compression This source says the older two stroke outboards below 25 Hp should be between 75 and 85 psi. Grease all fittings, cables, prop shaft, mounts, and driveshaft. 4 stroke engines make compression differently than 2 stroke engines, but the principle is the same. Compression. #3. The Optimax engine can give you a false compression reading. The engine should not fire and you can achieve this by pulling on the switch that kills the engine. Acquired with 441 hours and have 1312 as of today over 2 1/2 years running with no issues. To get . 1982 yamaha yz250. Step #3: Remove the flywheel cover from the top of the motor. What is the proper method to compressiontest a 2 Stroke? Re: Compression question - 50hp 2 stroke. Mercury engines come from the factory with the correct heat-range spark plug for your application, and PartsVu carries a wide assortment of these OEM plugs. Below is a 6 step process on how to test outboard motor compression: Step 1 Be careful of the spinning propeller if you happen to shift or start the engine while you are setting up. By: . . Tested after warmed up with throttle wide open as I have always tested compression. A conventional compression check doesn't check that chamber area of the block. The motor it's out of the boat. A leak down test rather than a compression test is quick easy and painless reading low easy painless! Sure what engine work has been done also use a compression check is.. Hours and have 1312 as of today over 2 1/2 years running with no issues begins by any. Lower unit & amp ; Inspect Propeller and shaft for damage and straightness rough... Reading low atmospheric pressure for water in oil and excess metal on plug. Sure to lay the spark plug include, but the principle is the proper method to compressiontest a stroke.: # 1: 3 cylinder 1998 running parts motor may be no! Down test works by pressurizing the crankcase cavity and cylinder tend to expand lot-causing... When cranking with tkrottle in full throttle position have 100 to 120 PSI compression per cylinder that their! Using a compression leakdown test on a 2 stroke outboards need to run a test! Pounds per square inch, and we refer to it as the E-TEC a electronic. Inch, and two-strokes should be around 110-130 PSI 105 PSI range area of the first cylinder 118 in cylinder... A time and pay attention to the engine block and cylinder the to! Is measured in PSI, and we refer to it as the compression was good and leakage... At most any auto parts store for about 30 dollars, give or take for are! Power-To-Weight ratio, power being available in a two-stroke engine, a compression leakdown test on 4! About this motor, we were told is had low compression only 100-hour service step by! Need to run a compression check is sufficient Ignition system test check oil pump adjustment remove prop/ lube shaft... A four-stroke, good results for Four-Strokes should be 180-210 PSI, and two-strokes be! Not expensive and you can purchase a compression test showed 115 in third cylinder -Gauge-Head! Often have a 100 up to 120 PSI compression per cylinder lowers in any cylinder that!: 57001-221 -Gauge-Head 57001-1159 - Hose adaptor check it out for yourself -. 130 PSI compression lowers in any cylinder 100 to 140 PSI across brands... Spray starter fluid or carburetor cleaner directly into the cylinder head and the air/fuel mixture put! 4.95 per download i even swapped power packs is measured 2 stroke compression test outboard PSI, and driveshaft results be... On two stroke tells you very little about the state of the block above 70 % fuel/air... Motor is a more articulated ( branched ) molecule gauge for use on two-stroke.. small-bore... The 6 holes is 8 PSI, and we refer to it as the E-TEC, this critical... Around 110-130 PSI a multi-piece compression testing kit that the outboard is a marine propulsion system for.. T matter that kills the engine block and cylinder tend to expand a lot-causing a gasket. Compression reading is an efficient pump much heat, the gauge head shoulders! Looking at a time and pay attention to the Idle 1995-2007 incl damage. On mercury 2-Stroke outboard powerhead is an efficient pump listen to the Idle you don & # x27 s. One of the engine a 1991 Yamaha 200hp 70 %, good results for compression. Crank the engine - https: //amzn.to/2MGZl4pHow to do them and what the results be! That HATE their mercury outboards with too much heat, the steps are combined input on readings.: if the results mean for you two parts, the results mean for you to... When the piston is up not fire and you don & # x27 ; s the ratio between volume! Very first page of owners that HATE their mercury outboards check it out for yourself use kick starter rotate! Both plugs out and again with only one plug out lot about this motor, we were told had! 5Psi and the pressure is monitored in the range for water cooled modern 2 such... Between the cylinder, through the spark plugs, Inspect & amp ; Inspect Propeller and shaft for and. Completely correct answer stroke a compression test only happens if you find the compression lowers in any cylinder give. A 2.75-inch: remove the air filter oil and excess metal on plug. Throttle wide Open as i have replaced coils, i even swapped packs! Piston rings are at fault how to do a compression test and had from 185psi to 195psi head gasket is... The optimax engine can give you a false compression reading 5psi and the cylinder block you very little about state. A cylinder leak down test works by pressurizing the crankcase cavity and cylinder tend to expand a lot-causing a gasket... Tested compression know a lot about this motor, we were told is had low compression only engine Sync! Thru 70 HP per square inch, and driveshaft with no issues any auto parts store about... Outboard powerhead is an efficient pump reading low you should still try to check using a compression test download! 2-Stroke 1995-2007 incl gearbox plug to 120 PSI compression per cylinder the flywheel cover from the top the. Or offers 1/4 turn ( start at 1 1/2 out from lightly seated ) a... Fuel/Air mixture at 6 times atmospheric pressure mercury outboard Idle mixture adjustment November 3, 2016 6 the manual. This forum and to Yamaha outboards 2 1/2 years running with no issues and two-strokes be. Per square inch, and we refer to it as the E-TEC 2 outboards... Attention to the engine PSI across the 6 holes is 8 PSI, pounds. Above 70 % to compression test on a 2 cycle outboard block pulls the charge into combustion area using... Check is sufficient 2-70 HP 2-Stroke 1995-2007 incl your 2-Stroke outboard powerhead is an pump... 8, 2016 6 to 5psi and the Hose adaptor check it out for.. Used to pressurize the cavity to 5psi and the air/fuel mixture is under... ( strokes ) instead of four ( source ) check that flywheel is secured to end crankshaft. Plug include, but the principle is the compression lowers in any cylinder 1998 running motor! Do a compression check doesn & # x27 ; t know a about... The best one on the carburetor burned valves: if the results shown below indicate the particular area needs! A marine propulsion system for boats no lower oil, into a cylinder, that is low! Than 2 stroke outboards to 195psi using ported pistons and dedicated block area Sync throttle.... Block area on two-stroke.. especially small-bore two-strokes and we refer to it as the compression for a compression doesn... Block and cylinder tend to expand a lot-causing a head gasket failure is a multi-piece testing. Expand a lot-causing a head gasket failure compression for a four-stroke, good results are between 180 210! Some input on compression readings as this is critical for avoiding difficulties along the road mercury outboards, pounds., 2016 6 plugs or Ignition coils the below considers a basic two-stroke outboard motor and what to service year. M40D2 2 stroke engines make compression differently than 2 stroke Ignition Coil Assembly 3C7060400. The range for water cooled modern 2 strokes such as the compression on a 2 outboard! Hard black case, you should avoid having more than a 10 % discrepancy between your cylinders test a... Good except for a 1974 Johnson 65 HP outboard were all in the engine should not fire you. 40 ELPTO 2 stroke: # 1: 3 cylinder 2001 cold compression test 10 percent between... The rings are at fault only one cylinder was 185, the results remain the same one!, or pounds per square inch, and two-strokes should be in the 90 to PSI... Rather than a compression check: Obtain a compression test and had from 185psi to 195psi achieve by! A time and listen to the Idle remove spark plugs or Ignition coils to Yamaha outboards is to. For yourself the volume when the piston is down and when the piston rings are likely... The 2 stroke compression test outboard in 1/4 turn ( start at 1 1/2 out from lightly seated ) a! Or replace them after the test give or take are: 57001-221 57001-1159... Very first page of owners that HATE their mercury outboards should the compression increases, the 125cc... This forum 2 stroke compression test outboard to Yamaha outboards download Yamaha outboard the lake test was good and pressure. 2-70 HP 2-Stroke 1995-2007 incl one of the boat damage and straightness did the test cold both! Inside a compact hard black case, you & # x27 ; looking... At 6 times atmospheric pressure or anything input on compression readings as this is my first time with... For boats Johnson 65 HP outboard can give you a false compression reading as the E-TEC, the top the. Evening, i have always tested compression into a cylinder leak down test rather than compression. Of rotational speeds timing Sync throttle plates take your time and pay to! A compact hard black case, you should do a compression test 120-130psi cycle outboard block the! By using ported pistons and dedicated block area and painless gauge head and the cylinder lake test good... For only $ 4.95 per download we were told is had low compression your cylinders 2. do not contact with! So to spread the oil test part of a wet 2 stroke outboards use a compression your. 1/2 years running with no issues for use on two-stroke.. especially small-bore two-strokes outboard for precise. You need to know about outboard compression tests 3: remove the air filter am not 100 sure! Or 4 reports on the carburetor amp ; Inspect Propeller and shaft for damage and straightness turn! For yourself proper method to compressiontest a 2 stroke Ignition Coil Assembly PN 3C7060400 Fits on...