So, I'm quite familiar with 4-stroke engines but I must admit I'm short on 2-stroke experience. I'm getting 110 psi of this acceptable for a 2-stroke? For a 4-stroke engine it's not great but acceptable. I don't know why it would be any different for 2-stroke but I thought I should ask.



Re: Compression??

Leon Swarmer /

yea, not great, but acceptable



Steamboat Aka J. R. Stevens /

Hey green, 2 and 4-stroke compression occur very differently. On a 2-stroke, when piston begins it's up stroke, the exhaust port is open. When the piston closes off the exhaust port real compression begins. Jim

Re: Compression??

Generally, 100psi is considered a bare minimum for any 2-cycle engine. They are not like 4-cycles, where they can still bang along (weakly) with 75 or 85psi.

Below 100psi, many 2-cycles will not run at all.

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