A better test is a leakdown test, with can help in determining where compression is being lost. * Check compression * Check and adjust belts * Lubricate and adjust bail cable (if applicable) * Check Paddles for wear * Check scraper bar for wear * Inspect and test all safety features * Power wash unit * Test overall operation of unit * Watch video on how to replace Paddles & Scraper Bars. Low Compression; This guide will help you diagnose quickly, why your Toro lawn mower won't start, restart, or stops when hot. I'm not sure if that test was hot or cold. compression Bill "Billy, I think it is the other way around on a compression test; if a tablespoon of oil raises compression dramatically, it points to the rings being the culprit. Checking Compression Levels. INTERPRETATION OF THE DATA There is more than one school of thought on what the compression of the average engine should be. I' wondering WHY you would bother taking a certified car to an independant mechanic. The only special tool required for the test is an engine compression gauge. This will usually involve emptying the oil supply into some sort of receptacle. Fantastic dealer carrying great Honda mowers. It has not been used much. If both the spark test and the fuel test fail, you will need to try a compression test. Only used three seasons - Answered by a verified Mechanic for Honda We use cookies to give you the best possible experience on our website. Disconnect the ignition coil, and locate the crankshaft at the front of the engine. The drive wheel assists you while using your. I was told my mower engine has California emission standards with small injectors that clog easily. You should not need high octane fuel in that mower engine. and/or Honda Motor Co. Honda Lawn Mowers - HRX HRR HRC HRS Mowers. View and Download Honda HT3813 service manual online. Completed the oil in the plug hole test and compression increased considerably so I put it down to worn rings. You can't spin the engine fast enough to disengage the ACR during starting. Chainsaws, trimmers and other power tools use a small, two-cycle engine Step 1 Unscrew and remove the cylinder cover with the screwdriver, if it's present on your small engine, to gain access to the spark plug. OK now the wet compression test is eighty psi. If the peak compression pressure is too low, it means that some of the air that should have been compressed in the cylinder is leaking out somewhere it shouldn't. Locate the spark plugs on the tractor mower. Testing for a broken timing belt can done in several different ways, and in this article I'm going to present to you the two most effective (and easiest) tests that I have used over the years to find out if the timing belt has broken or not. Honda make reliable, well designed and constructed mowers. An engine compression test will tell you many things about the mechanical condition of your engine. If you only have a compression tester, the pressure should be around 60 psi. I went thru the entire electric from battery, sol and removing starter to test it. No compression on Honda engine on my mower - Answered by a verified Technician. Thanks for answering bertsmobile, you saved me a lot of work. Remove the spark plug. Compression Test. Thanks for the video. The guy took it to the mechanic and the mechanic said the motor had no compression and that it needs a new engine. Thanks for the video. Also, lawn mowers allow you to cut your lawn in a uniform fashion. , I have a BP75AR rally mower. Please no repair questions. <-----a low compression cylinder after warming up wouldnt do that. Thanks for answering bertsmobile, you saved me a lot of work. Lowering Suspenion Kit fit VW Golf Rabbit MK1 Jetta MK1 Coilovers Springs Shocks. It measured 165psi I ran the compression test 3 times and each time I got the same reading. Two and Three Stage Snow Blower Tune-Up Checklist. You only take out 1 spark plug and you test that plug hole with the tester. Honda GXV390 13 hp Vertical Commercial Engine Honda Engines Professionals rely on the GXV390 to deliver reliable, easy starting, fuel efficent performance, day in and day out. This system, which is connected to the camshaft, reduces compression by opening the exhaust valve slightly when the engine is being started. Honda's HRC216HXA commercial mower is a 21. You'll find Honda GX Series overhead valve engines on a wide variety of construction, maintenance, and premium power equipment. The only special tool required for the test is an engine compression gauge. Honda Ride on Mower - intermittent problem - misfire? Honda Ride on Mower - intermittent problem - misfire? If both sparks are good then check the valve clearances then do a compression test. This system, which is connected to the camshaft, reduces compression by opening the exhaust valve slightly when the engine is being started. as appropriate from the context. What numbers should be good for a 300D 2. can you tell me when this happens does it bend the valves. You'll find Honda GX Series overhead valve engines on a wide variety of construction, maintenance, and premium power equipment. maintenance air cleaner spark plug exhaust system decarboning cylinder head ignition timing. When a gas lawn mower won't start, it usually needs a tune-up, which includes changing the fuel, spark plug and air filter. Honda Lawn Mower Oil - I realize that you're trying to find articles on our blog within the headline Honda Lawn Mower Oil of choices of articles that we got. Honda Canada Inc. : In this instructable I will show you how to repair a lawn mower engine, and how to finally kill those gremlins which have been lurching in its bowels. Your Q&A may be posted to Jackssmallengines. Ask us about the Husqvarna 577262701 10MM COMPRESSION TEST. Toro use several different engine manufactures - Briggs & Stratton, Kawasaki, Honda and Toro engines. By Deanna Sclar. Buy 8PCS Professional Tester Test Kit Cylinder Compression Gas Engine Set Automotive Tool Gauge for Car & Truck: Compression Gauges - Amazon. Wet Engine Compression Test. A better test is a leakdown test, with can help in determining where compression is being lost. A pressure gauge is connected in place of the spark plug. Mower: Honda HRR216K9VYA. I'm not sure if that test was hot or cold. There are four distinct phases in a four-stroke cycle: induction, compression, power, and exhaust. Spark Test. This is a guage that attaches to the top of your engine. maintenance air cleaner spark plug exhaust system decarboning cylinder head ignition timing. We have 2 Honda cbr650f manuals available for free PDF CYLINDER COMPRESSION TEST 197. Honda’s automatic mechanical decompression system is designed to give you quicker, easier starts. Many newer small engines have automatic compression release to aid starting. Just like on your lawn mower. general information safety instructions maintenance model and serial numbers two-cycle engine theory and operation carburetor theory and operation special tools list ii. It's a different model to yours but right from new it struggled with thick grass. Maybe two shots. You are over complicating the compression testing procedure. Honda Roto-Stop ® blade stop system allows you to step away from the mower, without having to start and restop the engine. Honda’s automatic mechanical decompression system is designed to give you quicker, easier starts. To determine whether pressure is escaping from the engine, you need to check the compression in the cylinders with a compression gauge, which measures the amount of pressure that the piston exerts on the fuel/air mixture before the spark plug fires the mixture. Dry and Wet Engine Compression Tutorial. Section 3, page 26 (of 132 pages) says an accurate compression test is difficult because of the Automatic Compression Release that changes the compression ration from 9. : In this instructable I will show you how to repair a lawn mower engine, and how to finally kill those gremlins which have been lurching in its bowels. By Deanna Sclar. I got it reassembled, but I can't get it to run. Hi Jack, I have a Honda Hydro Static walk behind model. Honda GX Series Engines have long been recognized as the industry leader in providing reliable, easy-starting, and fuel efficient small engines. Hi, I have a Honda GV 400 11 hp engine on my Deutscher ride on lawn mower, my problem is that it runs for about 10 mins then shuts down, will not go until it has completely cooled down When it has cold down it goes again, until now it has always started on the second pull always. How do you run a compression test on a diesel? Going to buy one if it passes a compression test. Ask us about the Husqvarna 577262701 10MM COMPRESSION TEST. If you only have a compression tester, the pressure should be around 60 psi. I recently purchased a a quality compression gauge and decided to check the compression on the old Tecumseh. One thing to acknowledge is that most snow throwers have an automatic compression release to assist starting. At times, you may find yourself with a lawnmower issue that is more difficult than replacing the oil, plug, or air cleaner. This seems to be an issue with the Honda engines but Honda calls it a ". and/or Honda Motor Co. Lawn mower engine compression is the amount of internal pressure the combustion chamber can hold. Asked in Fuel and Engines , Honda , Lawn Mowers and Garden Tools How much compression is good on a. Page 1: How to Test Engine Compression (Honda 1. Below is a chart of common Engine problems and some easy troubleshooting to fix the problem you may be experiencing. There is cold valve lash of. Compression test on a lawn mower confirming. can you tell me when this happens does it bend the valves. Thanks for answering bertsmobile, you saved me a lot of work. An engine with low compression in one cylinder will present itself by having a misfire and running rough while no compression in all cylinders will cause the engine not to start. Honda's automatic mechanical decompression system is designed to give you quicker, easier starts. Honda invited a group of journalists to its proving ground in the California desert to test ride/drive its one-off custom riding lawn mower. You can't spin the engine fast enough to disengage the ACR during starting. This guide won't cover each of these engine types, and so your engine may look different to the ones used here. You can't get an accurate compression test on that engine. Checking Compression Levels. Honda's automatic mechanical decompression system is designed to give you quicker, easier starts. There's no need to run a small lawnmower. When I first got the assignment, I scoffed. Honda make reliable, well designed and constructed mowers. LAWN MOWERS 13 RIDING MOWERS/LAWN TRACTORS 15 COMPRESSION VALVE CLEARANCE E300,K1,K2,K3 EM300,K1,K2,K3 E300 NGK CM6 0. Page 1: How to Test Engine Compression (Honda 1. Earlier today I did a test again cold and got 45 with both pull and electric. Compression Test. Is there a cheap way to increase compression on my small block Chevy? I have a 350 small block with iron heads. Only one test on each. Previous owner tried to fix, looks like he replaced one intake valve with new valve guide seal, headgasket and the piston looks new, but may just be clean from having. Civic remained strong, while electrified vehicles set a new annual mark, contributing to a 0. The Honda G42 engine has a slide valve (L-head) design and camshaft driven by a single row chain driven by the crankshaft. "Since all 3 cylinders have the same reading, I'd go with stuck rings. You are over complicating the compression testing procedure. There will always be a difference of something. Very dissaponted in Honda mowers and my Honda dealer. Can bad valve lash effect compression? 1999 Acura Integra 1. The reason we no longer check compression is most engines today have a compression release to ease starting. I bought this so that I could test the compression of all of my small engine equipment. No compression on Honda engine on my mower - Answered by a verified Technician. Maybe two shots. The Honda G42 is a 171 cc single-cylinder air-coolled 4-stroke internal combustion small gasoline engine manufactured by Honda Motor Company since 1972 for general-purpose applications. 1x 3" Pressure Gauge. I'm not sure if that test was hot or cold. The ability to confine this explosion in the cylinder is measured and called compression. Then go on to the other 1 cylinder and test only 1 spark plug hole. A tester is screwed into the spark plug hole with the position at TDC with both valve closed and 100 pounds of compressed air is pumped into the cylinder and a percentage is given as to the leakage you have from valve and ring blowby. Testing a hard to find Misfire, Rough Idle Condition. A better test is a leakdown test, with can help in determining where compression is being lost. Any leak out of the cylinder is. It has LOW power. View online or download Honda CM400A Shop Manual. How do you run a compression test on a diesel? Going to buy one if it passes a compression test. Honda Lawn Mower Oil - I realize that you're trying to find articles on our blog within the headline Honda Lawn Mower Oil of choices of articles that we got. Determine whether worn valves or worn piston rings are the cause of your low compression. It has been determined through testing, a simple and accurate indication of compression can be made as follows: Insert compression gauge in one cylinder and crank engine over until no further increase in pressure and record reading, Repeat on the other cylinder and record that reading. If both the spark test and the fuel test fail, you will need to try a compression test. product manuals. I purchased my HRX217HYA Honda push mower at Bud Herbert in Harrison, OH. Honda's HRC216HXA commercial mower is a 21. Also, this test article assumes that the engine starts and runs and that you're testing a misfire condition. Lawn mower engine compression is the amount of internal pressure the combustion chamber can hold. But, why would you want to do a compression test?. Many auto repair and small engine repair shops carry compression gauges, which measure the internal combustion pressure of the lawn mower engine. It has spark, so I thought I'd try a compression test and it wasn't encouraging. An engine compression test is the most practical way to learn about the mechanical condition of your engine. First you say a prayer to the deity of your choice that it's only the head gasket. There are basically two types of lawnmowers: push mowers and riding. You should not need high octane fuel in that mower engine. Honda Lawn Mower Engine Carburetor Problems. Here's why and how it's done. 3% gain for the Honda brand in 2019. Now that my new car uses 91+, how would the little Briggs and Stratten engine handle the higher octane? Will it be alright, or should I make a separate transaction when I fill up my car and get 87 for the gas can? No way will I run 87 in my car. Only one test on each. This seems to be an issue with the Honda engines but Honda calls it a ". A good compression reading will also deliver more power to the lawn mower cutting blades. This system, which is connected to the camshaft, reduces compression by opening the exhaust valve slightly when the engine is being started. Roto-Stop ®: Stop the blades without stopping the engine. Choose from top rated residential mowers and heavy duty commercial walk behind mowers. product manuals. Small Engine Troubleshooting. Now, you have to determine if it's the head gasket or not. When I was setting the valve clearance I noticed the exhaust do a little dip on the compression stroke and I knew that was the CR but I didn't know it would effect the compression test. Get a new carb kit and tear the carb apart. It sounds like it has good compression and it feels normal to pull. Anything above 80 psi is great, anything less and it’s likely your piston and rings need replacing. Ignition System. Product support for Honda generators, mowers, snowblowers, tillers, trimmers, and pumps, including manuals, service information, parts information, and warranty. No compression on Honda engine on my mower - Answered by a verified Technician. OK now the wet compression test is eighty psi. Put the compression tester back in. You can't spin the engine fast enough to disengage the ACR during starting. " I thought that's what I said. Honda Canada Inc. The bloke who bought it I am pretty sure was just after the base and the catcher so all in all a good result. The mower quickly sold on ebay for $50 and considering I only paid $5 for it no money was lost on this mower. Most techs are now using a cylinder leak down tester. So why won't your Honda mower start? The most common reason a Honda mower won't start is because the carburettor is gummed up. When I was setting the valve clearance I noticed the exhaust do a little dip on the compression stroke and I knew that was the CR but I didn't know it would effect the compression test. Buy a Pulley- Camshaft [14320-ZL8-010] for your Lawn Equipment - This camshaft pulley is and original part from the Honda manufacturer. A compression test is a good way to check the engine's ability to create pressure. The only special tool required for the test is an engine compression gauge. Riding Mower - how to do a leak down test (Video) DIAGNOSING A BLOWN HEAD GASKET WITH A HOME MADE CYLINDER LEAK DOWN TESTER HONDA SOHC VTEC 1. After 5 pulls, I got ~30 psi. With 360 inclinable technology, the GX50 delivers powerful performance in a compact package. It's a different model to yours but right from new it struggled with thick grass. Ignition System. Get a new carb kit and tear the carb apart. Most techs are now using a cylinder leak down tester. Mower: Honda HRR216K9VYA. Diagnosing the Compression System. Then check the battery voltage with the engine running (if possible) it should be higher, about 13. This manual covers the operation and maintenance of GX240 l GX340 engines and is based on GX240 engine. Think of it as a normal cylinder with only 1 spark plug. I asked if the engine had a compression release and they said no. Huge selection of Lawn Mowers. It has a Briggs 4 cycle engine. You bought one, so you already know this. Anyone know how to do this on a GX390? IF it's a simple enough repair I'd like to be able to do it myself. It sounds like it has good compression and it feels normal to pull. Testing a hard to find Misfire, Rough Idle Condition. You should not need high octane fuel in that mower engine. As a general rule a compression of 135 PSI or better is excellent, and a compression of 85 PSI or lower is extremely bad. Hank's Garage 18,123 views. Asked in Fuel and Engines, Honda, Lawn Mowers and Garden Tools A compression test is a good place to start. Determine whether worn valves or worn piston rings are the cause of your low compression. Running rough or losing power, there may be a lack of engine compression in one or more cylinders. Lawn mower engine compression is the amount of internal pressure the combustion chamber can hold. Asked in Fuel and Engines , Honda , Lawn Mowers and Garden Tools How much compression is good on a. Thanks for the video. What is Normal Compression John Deere Gator John Deere Gator Going through my new-to-me Gator CX 4X2 and noticed not a lot of resistance as the starter spins the Kawasaki engine over. Two and Three Stage Snow Blower Tune-Up Checklist. Maybe two shots. A compression check revealed 40 psi with the choke off. I have check the compression of my engine at hot and it give 118 psi to me. Honda Ride on Mower - intermittent problem - misfire? Honda Ride on Mower - intermittent problem - misfire? If both sparks are good then check the valve clearances then do a compression test. You'll find Honda GX Series overhead valve engines on a wide variety of construction, maintenance, and premium power equipment. Anything above 80 psi is great, anything less and it’s likely your piston and rings need replacing. I've got a pretty old HR215 that I believe had an oil leak and was then run out of oil and stopped running. Honda Lawn Mower Engine Carburetor Problems - I realize that you're trying to find articles on our blog within the headline Honda Lawn Mower Engine Carburetor Problems of choices of articles that we got. After 5 pulls, I got ~30 psi. [Mower starts] source (2). It's a different model to yours but right from new it struggled with thick grass. "Since all 3 cylinders have the same reading, I'd go with stuck rings. Honda trucks set a new all-time annual sales record with HR-V and CR-V also reaching all-time annual bests. and sold as part of the original equipment of machinery or equipment when such machinery or equipment is manufactured in Canada. That compression is fine. Very dissaponted in Honda mowers and my Honda dealer. Page 1: How to Test Engine Compression (Honda 1. A good compression reading will also deliver more power to the lawn mower cutting blades. Product support for Honda generators, mowers, snowblowers, tillers, trimmers, and pumps, including manuals, service information, parts information, and warranty. I recently purchased a a quality compression gauge and decided to check the compression on the old Tecumseh. Ok, remove that cover and turn over the engine (be careful of moving parts and fingers) also, while you have the cover off, look to see if the push rods are still in place, some times if a valve sticks, a push rod can fall out of its correct location. That will tell you a lot about the piston/cylinder. This is a guage that attaches to the top of your engine. Hoping the valves are way off! Guido. Diagnose misfires, low power, or starting trouble easily with a compression check. Joing the discussion as our knowledge base expands to help you with your motor oil needs. Failed Compression Test If the lawn mower has lost power or has an oil leak around the head gasket seal, a sure way to diagnose a blown gasket seal is through a compression test. Mower is approx 10 yrs old, but had new engine with 10 hrs on it when I bought it. No compression on Honda engine on my mower - Answered by a verified Technician. I asked if the engine had a compression release and they said no. I went thru the entire electric from battery, sol and removing starter to test it. Any one know what is the valve setting for a Honda push mower 5hp engine? They are now at. Many auto repair and small engine repair shops carry compression gauges, which measure the internal combustion pressure of the lawn mower engine. This system, which is connected to the camshaft, reduces compression by opening the exhaust valve slightly when the engine is being started. This manual covers the operation and maintenance of GX240 l GX340 engines and is based on GX240 engine. Mulching Lawn Mower Lawn Mower Repair Lawn Mower Maintenance Best Lawn Mower Lawn Mower Parts Cordless Mower Rotary Mower Garden Tools Lawn And Garden What others are saying Many homeowners strive for the perfect, emerald-green lawn, which often means that their lawn mower suffers considerable use and abuse. But, why would you want to do a compression test?. Motorcycle Automobile Offroad Vehicle Lawn Mower Engine. Outdoor Power Equipment (Lawn Mowers, Snow Blowers, I ran a compression test on it and am getting a reading or 50 psi! Although Honda is one. Your Q&A may be posted to Jackssmallengines. We have top of the line engine compression test kits that let you determine each cylinder's compression easily to give you a solid picture of your engine's health. Running rough or losing power, there may be a lack of engine compression in one or more cylinders. Dry and Wet Engine Compression Tutorial. There will always be a difference of something. INTERPRETATION OF THE DATA There is more than one school of thought on what the compression of the average engine should be. Honda HRR216VXA HRR216VYA Service Manual Table of Contents. With 360 inclinable technology, the GX50 delivers powerful performance in a compact package. Lawn mower engine compression is the amount of internal pressure the combustion chamber can hold. No compression on Honda engine on my mower - Answered by a verified Technician. It has spark, so I thought I'd try a compression test and it wasn't encouraging. Small Engine Troubleshooting. of coarse for us that is a great deal they send out the engine and cover the labor, sears can't lose and we are there less time to swap it out and the customer of coarse is a lot. Tomorrow I will do the above to the letter I will let you know. Loss reading An engine leakdown test is a compression test in reverse. INTERPRETATION OF THE DATA There is more than one school of thought on what the compression of the average engine should be. Honda’s automatic mechanical decompression system is designed to give you quicker, easier starts. It has been determined through testing, a simple and accurate indication of compression can be made as follows: Insert compression gauge in one cylinder and crank engine over until no further increase in pressure and record reading, Repeat on the other cylinder and record that reading. You can't get an accurate compression test on that engine. That compression is fine. The Honda G42 is a 171 cc single-cylinder air-coolled 4-stroke internal combustion small gasoline engine manufactured by Honda Motor Company since 1972 for general-purpose applications. You Honda will crank but not start. This system, which is connected to the camshaft, reduces compression by opening the exhaust valve slightly when the engine is being started. Any one know what is the valve setting for a Honda push mower 5hp engine? They are now at. Failed Compression Test If the lawn mower has lost power or has an oil leak around the head gasket seal, a sure way to diagnose a blown gasket seal is through a compression test. OK now the wet compression test is eighty psi. Thanks for answering bertsmobile, you saved me a lot of work. You can't spin the engine fast enough to disengage the ACR during starting. Disclaimer: Due to factors beyond the control of Hank's Garage, I cannot guarantee against improper use or unauthorized modifications of this information. Locate the spark plugs on the tractor mower. Clean plug, spray some carb cleaner or brake cleaner in the intake & give it a pull. This manual covers the operation and maintenance of GX240 l GX340 engines and is based on GX240 engine. Huge selection of Lawn Mowers. Honda invited a group of journalists to its proving ground in the California desert to test ride/drive its one-off custom riding lawn mower. " I thought that's what I said. It has LOW power. With 360 inclinable technology, the GX50 delivers powerful performance in a compact package. Small Engine Specification Comparison Chart. Loss reading An engine leakdown test is a compression test in reverse. 1x 3" Pressure Gauge. Completed the oil in the plug hole test and compression increased considerably so I put it down to worn rings. Hi Jack, I have a Honda Hydro Static walk behind model. This system, which is connected to the camshaft, reduces compression by opening the exhaust valve slightly when the engine is being started. The lawn and garden side of the company is continuously growing with top brand names playing a large part in our success these brands include Honda, Tanaka, Lawnking, Castel, Harry, Ariens, Apache, Galgi, Shibaura, Westwood, Countax, Atco, Mountfield, Hayter, Oregon & Briggs & Stratton. How to use "quench area" to increase engine compression. I purchased my HRX217HYA Honda push mower at Bud Herbert in Harrison, OH. Here's why and how it's done. You can't get an accurate compression test on that engine. You only take out 1 spark plug and you test that plug hole with the tester. Now, with approx 100 hrs on it, it takes forever to start (pull start) and has low compression of 60 lbs. This self propelled lawn mower feature's Honda's long recognized quiet durable and fuel-efficient engine technology. Remove the spark plug, and pour a cap full of W30 motor oil into the top of the open cylinder. The spark plug then ignites the compressed fuel/air mixture in the combustion chamber. Thanks for answering bertsmobile, you saved me a lot of work. Outdoor Power Equipment (Lawn Mowers, Snow Blowers, I ran a compression test on it and am getting a reading or 50 psi! Although Honda is one. Honda Ride on Mower - intermittent problem - misfire? Honda Ride on Mower - intermittent problem - misfire? If both sparks are good then check the valve clearances then do a compression test. Specifications Service. LAWN MOWERS 13 RIDING MOWERS/LAWN TRACTORS 15 COMPRESSION VALVE CLEARANCE E300,K1,K2,K3 EM300,K1,K2,K3 E300 NGK CM6 0. That test was such bad news I repeated the test after warming up the engine and got 45 with both pull and electric. Honda invited a group of journalists to its proving ground in the California desert to test ride/drive its one-off custom riding lawn mower. gday still sussing out problems with my gx 25 i done a comp test results are dry 30psi no throttle 90psi with throttle wet test with oil 60psi no throttle 120psi with throttle quistion is what should it be on a good / near new engine iv got power and cutting out problems and hard to start. Go to engage mower and it will nearly kill it. Anything above 80 psi is great, anything less and it’s likely your piston and rings need replacing. general information safety instructions maintenance model and serial numbers two-cycle engine theory and operation carburetor theory and operation special tools list ii. Didn't make any difference; 100 psi after 5 pulls. They helped me select the right mower for me and I couldn't be any happier. It's also more expensive than other types of gas, such as 87 octane. 4:1 to about 2:1 when starting the engine. Lawn mower engine compression is the amount of internal pressure the combustion chamber can hold. - Honda del Sol question to a compression test in that. You Honda will crank but not start. Compression Tester Firstly we remove the spark plug; then screw in the compression tester. Lowering Suspenion Kit fit VW Golf Rabbit MK1 Jetta MK1 Coilovers Springs Shocks. After 5 pulls, I got ~30 psi. The engine is then cranked to create a pressure reading. One caution: I had to use an adapter on my compression gauge. Motorcycle Automobile Offroad Vehicle Lawn Mower Engine. product manuals. If both the spark test and the fuel test fail, you will need to try a compression test. The Honda GX50 Mini 4-Stroke Engine is one of the world's smallest 4-stroke engines. That will tell you a lot about the piston/cylinder. This ten year old lawn mower of mine is making the same. To determine whether pressure is escaping from the engine, you need to check the compression in the cylinders with a compression gauge, which measures the amount of pressure that the piston exerts on the fuel/air mixture before the spark plug fires the mixture.