02' YZ250 compression?

bought a used 02' YZ250, guy said it had newer top end, i checked compression today only getting 155PSI, but the bike starts first kick each time never fail and works great. What should the compresion be? is 155PSI bad?

Have you search the factory specs for the compression tolerance?

 is 155PSI bad?

 yeap that is bad, I get 230 when new and when I change the piston it is still 230psi , I think 180 psi is the minimum. 

Have you search the factory specs for the compression tolerance?

 

No I haven't, I'll check that

 

yeap that is bad, I get 230 when new and when I change the piston it is still 230psi , I think 180 psi is the minimum.

Kinda thought it was bad, I keep coming up with 180 min to 240 when I looked it up. It's working really good for 155psi, kinda threw me off.

open the throttle and try it again if that was done with no open throttle before

Edited by arnego2

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