First, turn the outboard motor over by hand, using the recoil start ideally at the normal starting pull speed. ... it should be fairly easy to perform a compression test on a motor; however there are many different types of motors today that can make this test a lot more difficult. Keeping this in consideration, how much compression should a 4 stroke outboard have? There are two basic ways to compression test an outboard. Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around 110-130 PSI. They don’t have ports like on the Two-Strokes. We’d like to invite you to come and check us out on our YouTube Channel: Born Again Boating! I have owned several Johnson / Evinrude outboard motors, a couple of Mercury’s, and at the time of this post one Yamaha four stroke. If you are dealing with an older engine with a lot of hours and it isn’t running. MILLION PARTS Professional Auto Engine Cylinder Compression Tester Gauge Meter 0-300 PSI Valv… OTC 5605 Deluxe Compression Tester Kit. It isn’t a bad idea to check the compression just to see if the engine is still in good shape or not. If you are looking for one kit that can work for almost all … I’d get the auto store tester!eval(ez_write_tag([[250,250],'bornagainboating_com-leader-2','ezslot_8',117,'0','0'])); Thank you for taking the time to read our article! Sometimes having a professional’s opinion is a great idea. It is tearing into the engine and investigating what is going on or just getting the engine running and run it until it explodes! What the compression test tells us, is what kind of shape the mechanics of the engine are in. You want to take out the bolts that are holding the coils in. An outboard gas engine needs air, fuel, spark, compression, and unobstructed exhaust — in the right amounts and at the right time. The first thing that most people think of when they hear the words, “compression test,” is expensive. When you are doing a regular service on a 15-year-old engine with 1500 hours. Selecting the Best Outboard Motor. Depending again on the Two or Four-Stroke aspect of the engine. You might be wondering this question, as I’ve had to answer it many times over the years to newer mechanics and boaters. Will change the results of your compression test. There are really only two things you will need once you get to this point. Request The Next Technician's Tuesday Video Topic. This is another one of those “controversial” subjects. How to Compression Test on Mercury 2-Stroke Outboard Engine November 17, 2016 Repair Manual Do-It-Yourself Outboard Repair Guides 2 Its highly recommended to always use a outboard repair manual for your specific year and model outboard engine when preforming a cylinder compression test on your motor. As long as it fits your engine, you are good to go! It will prove whether the engine has a good powerhead or not. What Outboard Compression Test Results Mean. 130, 130, 120 are good numbers just check it every year when your annual service is done to make sure the gap doesn't widen. There is just a lot of things that can cause this. Such as when you do your own service, and you would like to check the compression while doing so. Pittsburgh Automotive. There isn’t any need to continue holding the button to see just how much more you can get. Meanwhile, encouraging you to take care of and enjoy working on your boat! Industry giant Yamaha Outboards has a four-stroke model line ranging from 2.5 to 425 horsepower, including the only direct-injected four-stroke on the market, the F425 XTO. More Boats. There's a problem loading this menu right now. All of the different brands are just going to have a slightly different process to go through, in order to perform the compression test.eval(ez_write_tag([[300,250],'bornagainboating_com-large-mobile-banner-2','ezslot_3',112,'0','0'])); That process has to do with how you get to the spark plugs to get them out. Having the engine warm and getting oil up into the cylinders sealing the rings and valves better. Prime members enjoy FREE Delivery and exclusive access to music, movies, TV shows, original audio series, and Kindle books. Compression test results will vary depending on what kind of engine you are working on. Compression testing is an extremely valuable diagnostic exercise for ensuring the continuing health of your L-series engine, or really any engine. Bounce/Leakdown Method This test can be performed without a compression gauge. For us in the boating world. Clearance. So, if you do the test while the engine is hot. Learning How to test outboard motor compression will provide an indication on whether the piston-rings are in an operational order and whether the cylinder is in good working order. Depending on the brand and manufacturer of the engine, it will determine what you can do at this point. The pro … Response must be less that 100,000 characters. So, the price tag really shouldn’t be the deciding factor in which one you decide to use. okay so I remove all the spark plug wires, then remove one spark plug and put the compression tester in that hole, and id put the boat throttle all the way down, and then turn the engine 4 rotations and read the results... is this correct? If you are by yourself, you are going to want a remote key switch or a starter button. Just Click Here! Usually, you can find a decent compression tester for under $50 at any of these places. 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