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Good Compression

Kitty Cat chat area, almost anything goes but keep it clean and snowmobile related.

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earl
Posts: 27
Joined: Mon Oct 05, 2015 12:50 am

Good Compression

Post by earl » Thu Dec 08, 2016 9:35 pm

what is the acceptable compression numbers for these KC's? 100 lbs? more-less?


snowcomingsoon
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Joined: Wed Jun 29, 2016 7:55 am
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Re: How to Check Compression in a Kitty Cat Snowmobile

Post by snowcomingsoon » Sat Dec 10, 2016 10:45 am

How To Check Compression in a Kitty Cat Snowmobile

I'd like to take this post a step further. Can someone provide the exact procedure to check compression on a Kitty Cat along with the range of values that you can consider normal? For example, engine cold or engine warm? Thanks!

sled_fixer
Posts: 1
Joined: Tue Dec 15, 2015 2:05 pm
Location: Ohio

Re: How to Check Compression in a Kitty Cat Snowmobile

Post by sled_fixer » Sun Dec 11, 2016 11:18 am

snowcomingsoon wrote: How To Check Compression in a Kitty Cat Snowmobile

I'd like to take this post a step further. Can someone provide the exact procedure to check compression on a Kitty Cat along with the range of values that you can consider normal? For example, engine cold or engine warm? Thanks!
1. Buy a compression tester
2. Remove the spark plug
3. Thread the compression tester fitting into the plug hole on the cylinder
4. Pull the rope/cord until the pressure reading is maxed-out
5. Make note of your pressure.

Test can be performed cold, but if the engine runs, you can also test with it warm, just take care not to burn your hands. I can find the compression ratio in the service manual but no actual values for the compression. As a rule of thumb less than 100 is low and more than 100 is acceptable.

Incidentally, the compression ratio in the manual is 6.7:1, so theoretically you would multiply 6.7 x 19 to get 127.3psi.

earl
Posts: 27
Joined: Mon Oct 05, 2015 12:50 am

Re: Good Compression

Post by earl » Sun Dec 11, 2016 1:54 pm

anything over 100 lbs is good thanks

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