what cylinder pressure should I have?

turbom1000 · Apr 17, 2019

I have 2018 summit 850 running 100 psi on pto side and 107 mag side (7000' elevation), seams low to me, anyone have numbers to compare? My arctic cat 800 has 125 both sides, everything else checks out but doesn't want to idle or start very good. 950 miles on 7lbs boost, thinking it needs freshened up.

Big10inch · Apr 17, 2019

Compression test is pretty much worthless, you need to do a leak down test. That will tell you the true condition of your piston and rings. If your Cat is at 125 and your new 850 Doo is at 100-107, my guess is it needs rings BAD, leakdown is probably over 10%. That is the test you need to do though.

Skidoox · Apr 17, 2019

I would check the reeds if you are running a turbo.

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what cylinder pressure should I have?

turbom1000

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Big10inch

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Skidoox

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