If you want some piece of mind, pull the pipe and "Y" pipe off the sled. Get a flash light and look into the exhaust port of the motor. As you roll the clutch back and forth look at the rings. If they are pitted I would replace. My 04 had compression in the 125 psi range when I did mine. New it was 150 ish.
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Compression wont always reveal if there is a problem of this type anyway, If you want to get a better piece of mind do a leakdown test. Compression will only tell you what i call the end maximum pressure the cylinder will hold and that varies ALOT depending on the method and other variables used to do the compression test. IMO compression tests should be done on a cold motor and throttle open 3-4 pulls, not a warm,lukewarm,hot,somewhat hot, get the idea. This way you get a consistant baseline to compare to in the future if you think you have a problem.
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a leak-down is a better/more accurate test, but in your case it does not sound like its needed...
A leak-down is usually done when the simpler compression check indicates something... or you have other symptoms.
(I am ASSUMING 130 for each cylinder) If so, your PSI readings are good, the real key is that each cylinder be within -10% (closer the better) of each other, meaning even wear. Even wear indicates that things are working nicely. check it again at 4.5K. The 800s had very few rings problems, the 03 600 was the "bad" one...
a leak-down is a better/more accurate test, but in your case it does not sound like its needed...
A leak-down is usually done when the simpler compression check indicates something... or you have other symptoms.
(I am ASSUMING 130 for each cylinder) If so, your PSI readings are good, the real key is that each cylinder be within -10% (closer the better) of each other, meaning even wear. Even wear indicates that things are working nicely. check it again at 4.5K. The 800s had very few rings problems, the 03 600 was the "bad" one...
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Actually 130 is a little low even on a warm motor, the + or - 10% is not exactly true. If your compression was dead on 120 both sides cold motor it would be bad even though they are the same.
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New rings need to be broken in before you get your full compression. That's why the break in period is critical. Do a search on break in. Many different philosophies on that too.
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That was going to be my next statement to the guy with the new 600 HO.
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It's really bad when you drop the dumb magnet down there. Been there done that,
Mark
Mark
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