compression ratings for sleds

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raco_guy

New member
Is there a website or something where you can look up "normal" compression readings for various makes/models of sleds?

Specifically for my case, I am looking to see what is an "acceptable" compression for a 2005 Skidoo Renegade 600 HO (non SDI). Sled has about 8000 miles on it, but runs great and had mechanic look at it last year and stated he could still see the original scratch marks on the cylinder walls and everything still looked good. I know he checked the compression last year, but I don't remember what it was, and I wanted to warm up the sled this weekend and do another compression check for security-sake, but I don't remember what its supposed to be. Still has original top end on the motor. It has been a great sled, and I won't ever get anything out of it to sell, so I keep it. Thanks for your help.
 
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markf419

New member
I can't say for sure about the doo's. I have 2 cat 600's, a 01 that overheated enough to melt the head o-rings runs 120 psi, 05 f-cat with 4+k runs 135 and my 2 800's run 155 and 160. Besides bolt-ons, all are stock.
 
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doospunk

Active member
raco_guy said:
Is there a website or something where you can look up "normal" compression readings for various makes/models of sleds?

Specifically for my case, I am looking to see what is an "acceptable" compression for a 2005 Skidoo Renegade 600 HO (non SDI). Sled has about 8000 miles on it, but runs great and had mechanic look at it last year and stated he could still see the original scratch marks on the cylinder walls and everything still looked good. I know he checked the compression last year, but I don't remember what it was, and I wanted to warm up the sled this weekend and do another compression check for security-sake, but I don't remember what its supposed to be. Still has original top end on the motor. It has been a great sled, and I won't ever get anything out of it to sell, so I keep it. Thanks for your help.
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I had an 04 800 gade, and I know the tolerance was between 130 and 135 PSI. Not quite sure about the 600, but would guess somewhere between 110 and 120. Ping Skylar on here. He had a gade 600 doo at one point, and would be able to tell ya.
 
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markf419

New member
It's important to note that the difference from cyl to cyl is more important than the actual compression itself, within reason. If you're getting better than 110 and they're within a few lbs of each other, I'd say you're ok. Some ppl say 10% diff. is good.... I'd rather be with 3-5%. If more than that, or if readings are lower than 105 or so, I'd do the top end. With those miles on it, I'd do it anyway. It's quite a simple job to do yourself. Just make sure you have the torque specs.
 
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(TK) Mustard Bucket

New member
markf8sp said:
It's important to note that the difference from cyl to cyl is more important than the actual compression itself, within reason. If you're getting better than 110 and they're within a few lbs of each other, I'd say you're ok. Some ppl say 10% diff. is good.... I'd rather be with 3-5%. If more than that, or if readings are lower than 105 or so, I'd do the top end. With those miles on it, I'd do it anyway. It's quite a simple job to do yourself. Just make sure you have the torque specs.
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So if they were within 0-2% of each other you would diagnose that as a bad motor.
 
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