humm confused...
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Why is your compression between 70 and 120psi?It should read a specific psi not a varying compression.Are you holding throttle wide open when doing test.Crank it over 5 or 6 times till needle stops going up.Thats your compression.If you did that and once it read 70psi and once it read 120psi your decomp might be shot or a stuck valve.Take about a tablespoon of oil and pour it into sparkplug hole and do compression test again.If it goes up your rings are wore if it stays low it could be a valve or decomp.
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QUOTE (Rookiex @ Dec 3 2008, 09:09 PM) <{POST_SNAPBACK}>
o no i was just replying to someones post they asked whats the normal compression for a test.
The reason I posted it like a question is because, the decomp. would make it lower than one would expect and if you didn't have at least that it could be why you can't get it to fire.
You have made sevreal comments that it is cranking over fast, so I was thinking if the decomp. broke and holding the valve open a little, it may be enough to drop comp enough to prevent it from fireing up.
I can still hear my Dad telling me "if it's got gas, spark and compression, it should run". I always added, timming to this because when I would finaly listen to him and check for all three. after that it was just a matter of timming.
I know these thing are high tech but without the basic three that high-tech dosen't do any good.
Also to much fuel isn't good either
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Interesting. I believe this is the quad I own now.
Problems found after the tear down-
Trans filter gobbled up
Small trans oil gears were marred and jammed
Wrist pin seized
Piston/rings/cylinder were heavily marred (w/ zero compression)
Rebuild to start this weekend. As always, thanks everyone for the support through this-- especially Dave, Pete, 27 and Tim.
Problems found after the tear down-
Trans filter gobbled up
Small trans oil gears were marred and jammed
Wrist pin seized
Piston/rings/cylinder were heavily marred (w/ zero compression)
Rebuild to start this weekend. As always, thanks everyone for the support through this-- especially Dave, Pete, 27 and Tim.