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monkeyballs
07-26-2008, 08:40 PM
Whats stock compression of a honda 400ex 2002. I just did a test and its 90psi. I finde that rather low. But then again I hear u cant get a accurat messurment for some reason. ty
Chin_Chilla
07-26-2008, 09:12 PM
I read somewhere that a stock 400EX should have around 125-128 PSI...could be wrong though :confused:
drew416ex
07-26-2008, 10:10 PM
I think its good if its between 100-125 psi or something like that. 100 being worn out. Are you holding the throttle open while you are doing it?
monkeyballs
07-27-2008, 06:53 AM
Originally posted by drew416ex
I think its good if its between 100-125 psi or something like that. 100 being worn out. Are you holding the throttle open while you are doing it? No I was not holding it open. Plz tell me that thats going 2 make the comp lower. It showed frigen 90 psi :-s. I thought there was somthing worng...
bbender85
07-27-2008, 08:13 AM
does it burn oil?
drew416ex
07-27-2008, 09:58 AM
Originally posted by monkeyballs
No I was not holding it open. Plz tell me that thats going 2 make the comp lower. It showed frigen 90 psi :-s. I thought there was somthing worng...

Yeah you are supposed to hold the throttle open when you do a comp. check
monkeyballs
07-27-2008, 12:48 PM
Originally posted by drew416ex
Yeah you are supposed to hold the throttle open when you do a comp. check Would it make that much of a dif?
ty
drew416ex
07-27-2008, 12:57 PM
Originally posted by monkeyballs
Would it make that much of a dif?
ty

Probably more than you would think
monkeyballs
07-27-2008, 02:32 PM
Originally posted by drew416ex
Probably more than you would think K good. lol Thought, I would not minde if they were finished :D. REBUILD TIME! Hc stg 2 high comp piston light weight. 440 big boar if needed. ty