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Discussion Boards > Active Subjects > Messages as Posted > John Deere Gator Forum

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 07-03-2017, 22:05 Post: 196806
bobinyelm



Join Date: Jun 2017
Location: Olympia, WA
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 16

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  What is Normal Compression

Going through my new-to-me Gator CX 4X2 and noticed not a lot of resistance as the starter spins the Kawasaki engine over.

I askem JD dealer, and they had no idea what was normal compression-the tech just said "not a lot."

I did a compression check and the first compression stroke made 30psi, and after about 5 strokes was up to 75psi. Further cranking accomplished nothing additional. That's with a very strong battery spinning teh motor over pretty quickly.

I did a search and one post mentioned 57 psi minimum is acceptable, and another post said 170psi is min-normal for each cylinder on a 2 cyl Kawasaki (that sounded high to me).

BIG difference!

I set the valves (tight 0.007", loose 0.005"Wink yeah right, but the intake was a tight 0.005" and the exhaust was a loose 0.007" so the additional adjustment I made probably didn't alter the compression.






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 07-05-2017, 00:00 Post: 196814
bobinyelm



Join Date: Jun 2017
Location: Olympia, WA
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  What is Normal Compression

You make some good points there.

When I do a car engine compression test I always make sure the throttle is held wide open. I completely neglected to do this in this situation and given how close d the butterfly is to get the idle speed down for smooth gear engagement, I'm sure the closed throttle restricted the intake air to produce good compression values.

I believe the horse power rating for the CX Kawasaki is like 8 or 9hp so It pretty much loafs along.

Given how little maintenance I believe my unit was given over at 640 hours, I guess I am looking for trouble. I am sure it never got a transmission fluid change, and I don't know when the order was changed.

I was willing to take a chance given the purchase price, and hopefully everything will be fine. It is a learning process.

Thanks, Bob






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