Compression Question

[robert0762]

yeah make sure you have the right end on iy bcause they do have diff lengths

[HOODWORKZ]

I have the right adapter for it..just tried it with bike warmed up and got the same results

[dajogejr]

Notwithstanding the questionable tool..where did the idea come from to do a compression test on a cold engine?

 

You always test a cold motor...then a warm motor. If there's not much difference between the two...that actually usually states a motor in decent health.

if There's a large number in difference, that signals problems.

 

Lastly, if you pour a cap full of oil through the spark plug hole(s) and crank it over by hand a couple times, then test again...if the compression jumps up considerably that signifies a worn motor as well.

 

To answer your question, a compression tester will not show a leak. It has a check valve in it. Once it has pressure, it will stay on the gauge until you release it via the push button on the valve.

 

To check for a leak, you need a leak down tester. Do a search. You can make your own...or buy one already done.

I got one off a guy in MI that works flat out awesome.

His name is Bob, and he ports out of his house/garage (like most builders)

 

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