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General Category => Yamaha FJ1100 / FJ1200 Running Problems => Topic started by: Paris on October 26, 2016, 09:48:28 AM

Title: Compression Values
Post by: Paris on October 26, 2016, 09:48:28 AM
Doing a compression test on a 88 FJ1200 returned values of between 80-90psi which seems a little low for my taste

Test was done cold with all the plugs out.

are these values correct? should this test be done with a hot motor?
Title: Re: Compression Values
Post by: racerrad8 on October 26, 2016, 09:49:50 AM
The readings are usually better on a warm engine.

Did you open the throttle to allow air into the cylinder while doing the test?

Randy - RPM
Title: Re: Compression Values
Post by: Paris on October 26, 2016, 10:45:27 AM
so i did everything wrong. :empathy2:

Cold motor and diddnt open the butterflys :dash2:

will retest tomorrow and post the results.