Well today, I did take all the spark plugs out and check the compression while holding open the throttle. Still got the same 65 may be a pound or so more. Then I also had the engine running and checked the compression in one of the cylinders and it was still the same. I’m really baffled. Could certain engines actually run with 65 pounds? I’m lost.Yes, remove all spark plugs when doing compression as well as full throttle. The starter is fighting the compression of the other 3 cylinders. You want it spinning as freely as possible for checking compression.
I am not at the bike now until Sunday. I will check to see what the bottom of the connector looks like. It advertises that is good for motorcycles and small engines. Of course that’s their advertisementThe cheap HF compression tester doesn't have the Schrader valves at the end of the hose. You can't use it for small engines or motorcycle engines
It it ain't like this it ain't gonna work
Did you remove all the plugs when you checked the compression after the engine was running??Well today, I did take all the spark plugs out and check the compression while holding open the throttle. Still got the same 65 may be a pound or so more. Then I also had the engine running and checked the compression in one of the cylinders and it was still the same. I’m really baffled. Could certain engines actually run with 65 pounds? I’m lost.
Yes I did. I’m lost over these findings.Did you remove all the plugs when you checked the compression after the engine was running??
All single cylinder motorcycles over 250 have a compression releaseI've never heard of motorcycles having a compression release. I've worked on a few, but haven't done compression tests on any.
First of all what motorcycle are you talking about ?Yes I did. I’m lost over these findings.
Around 75 psi (give or take) is about the minimum for a 4-stroke small engine to start and run. Obviously, you have a compression release, or your gauge is inaccurate. Put a little oil into the cylinder and test it again. If the reading increases substantially, you have worn piston rings. Don’t get too focused on compression numbers if engine is starting and running strong. Perform a leak down test if it is bothering you that much.Yes I did. I’m lost over these findings.