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Discussion Starter · #1 ·
What kind of compression should there be on a 02 800 engine that is stock.

Right now im getting 100 psi on the pto cylinder and 120 on the mag side

Ola
 

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not good
verify your gauge is good and you pulled the cord 5 times on both. Over 10% difference is bad and also if those figures are accurate, they should both be over 120 psi.
 

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my compression on my 03 800 rev is 154 1n both jugs close to sea level
 

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Check the sides of your rings you may have had the coating come offof them and check the cyl. bore for damage, I have a company that made peformance chrome rings for the 6+8 pm me for info
 
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