I keep reading post after post about doing compression test on small engines. The thing is the type of compression test you do on your car does not give you the data you are looking for when it comes to a small engine. In fact to my knowledge no small gasoline engine manufacturer even gives compression data for there engines. The test that is used instead of a compression test for small engines is called a leak-down test. 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. If you are doing auto type compression test on an engine with a ACR like the Kohler K-341 you will get a very low reading on compression because the ACR does not drop out until the engine is running. And with a leak-down tester you can feel the air blowing by the rings and out the oil fill hole or out the carb or muffler so you know where your problem is. I did compression test on small engines for years before I found out just how useless there are.