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Discussion Starter · #1 ·
I am having problems with low compression. I adjusted the valves, it ran for a week, now it won't run. I get a lot of variation when I check the compression. Anywhere from 10PSI to 130PSI. Any help would be appreciated.
 

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305 Posts
Test it dry then put some oil in the cylinder if compression goes up a lot you need new rings.
 

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Check your valve adjustment again,it could be too tight holding a valve partly open.
 
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Discussion Starter · #4 ·
I set the valve clearance to .15mm @ 12ft/lbs. The compression is showing about 135psi consistently. I am just leary of putting it all back together and the same problem happening again.
 

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could have a valve not sealing or a timming chain really stretched out and causing improper valve adjustment. i set mine .006 straight across.
 
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Discussion Starter · #6 ·
Well, I had 135psi of compression. I put everything back together and it will not start. If I put my finger over the spark plug hole, the compression still feels good. I have good spark. The plug has gas on it. Any ideas?


I got it to start. It ran with almost no power. Now I cannot get it to restart. Any help would be appreciated.
 

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set the valves at 6thousandths and i doubt thats your problem ,sounds like the exhaust valve isnt sealing, the valve seal can work itself away from the head, happend to me anyway
 
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