automatic compression release stuck no compression needs some tips on fixing this - Polaris ATV Forum
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post #1 of 9 (permalink) Old 10-21-2012, 11:17 AM Thread Starter
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automatic compression release stuck no compression needs some tips on fixing this

Let me start off by saying the 6x6 has been running great and I went to start it after it had sat for a couple of weeks and the motor fired up ran for a minute or so like always and when I went to start it again it sounded like it has no compression, so I checked the timing pulled the valve cover and everything checks out. I looked at the factory manual but its for a 99 & up 500 6x6 mines a 96 425 and there is a difference in the motors, has anyone run into this problem before? Sure could use a few tips on a fix for this issue.. BigBoss6x6
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post #2 of 9 (permalink) Old 10-21-2012, 02:33 PM
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post #3 of 9 (permalink) Old 10-21-2012, 06:04 PM
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Hmmph, they share the same cases.If it sounds like it has no compression, you may want to take the valve cover off and see if the timing chain is still on or in one piece.
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post #4 of 9 (permalink) Old 10-21-2012, 06:56 PM Thread Starter
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The timing chain and sprocket and cam are about a year old and they are fine & the engine is in time.All timing marks line up the only thing I can figure is the automatic compression release is stuck. I was hoping someone else had a issues like this before and knew of a simple fix
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post #5 of 9 (permalink) Old 10-22-2012, 07:52 AM
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compression release is just the ball in the cam, the rcker arm hits it when it comes around, opening exhaust valve, Ive seen rocker get worn so tey didnt relieve compression, or spring break but then they didnt relieve compression, not much to cause no compression unless valves are bad, piston , rings ect
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post #6 of 9 (permalink) Old 10-23-2012, 09:46 AM Thread Starter
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Upon further inspection I noticed that a field mouse got into my airbox and built a nest and it looks like when the motor fired up for a minute or so that a piece of the nest might have been sucked up into motor and at this point I'm not quite sure how deep I need to go into the motor,anyone have any suggestions
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post #7 of 9 (permalink) Old 10-23-2012, 07:40 PM
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you had me a bit worried until you mentioned mice XD those little buggers choose the weirdest places to sleep.

unless the air filter was damaged by the mice I don't think any foreign debris should have gotten past it? after you cleaned the nest out did it work again?

if anything did get past that I would think the Carb would be the next place for the debris to go. after that it would be the combustion chamber and then the exhaust pipe and muffler.
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post #8 of 9 (permalink) Old 10-26-2012, 09:15 AM Thread Starter
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A quick update I took the carb off and didn't see anything that would be a problem in the carb or in the intake so its time to pull the head, that should tell the story behind the compression issue. BigBoss6x6
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post #9 of 9 (permalink) Old 11-14-2013, 02:07 PM
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Question What was the final fix to no compression?

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Originally Posted by BigBoss6x6 View Post
A quick update I took the carb off and didn't see anything that would be a problem in the carb or in the intake so its time to pull the head, that should tell the story behind the compression issue. BigBoss6x6
What was the final fix?
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