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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by George Guille, It's going to be a long 300km... Bolivian Amazon

I haven't been everywhere...
but it's on my list!


Photo by George Guille
It's going to be a long 300km...
Bolivian Amazon



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  #1  
Old 11 Jan 2017
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'84 XT600 Compression Test

Hey folks!
My bike has a compression release on the kickstart, obviously, and I am wondering how this would effect a compression test. I'd like to test it, but it seems to me that the compression release would skew my reading quite a bit. My Clymer manual doesn't mention it and list the compression spec somewhere around 150 PSI. Is that right, or should I expect a lower compression reading given the compression release?
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Old 11 Jan 2017
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If you didnt have compression your bike cant move forward, just warm up engine and do the compression test. Remember to turn off your fuel and empty carb, keep throttle on full and turn it.
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Old 11 Jan 2017
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You need to disable the auto compression to get a correct reading, otherwise the pressure will bleed through the open valve.
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Old 11 Jan 2017
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Ok, thinking it was compr before exhaust valve open, but you find out just do the test before release cable and you have both measurements.
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Old 11 Jan 2017
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That makes sense. Thanks for the advice. I'll update y'all when I run the test.
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