Compresion on a stock EX?

[twisted threads]

How many foot pounds of compresion does a stock 400ex have??

[UglyMotha™]

foot pounds:confused:

do you mean psi= pounds per square inch


i'm not sure i don't have my manual here but i think it's somwhere around 140-160psi i think but not completly positive

[300exazzkikr]

if someone know what it's supposed to be in psi, i guess you could convert it into pounds per foot, but why? I believe your thinking of torque specs.

[fourtrax400ex]

a stock 400ex is suppose to be between 115 and 130psi, im 90% sure of this, correct me if im wrong!!

[twisted threads]

yes I did mean PSI not foot pounds....sorry..:o It was late and I knew that wasnt right but I also knew you guys would know what I was talking about. I figured it was some were around 125 psi. I many PSI would you half to have before you start running race fuel??

[sly400ex]

I've heard around 170 range, correct ME if I'm wrong.......;)

[UglyMotha™]

where can i get a compression tester i have a really nice automotive mac tools one with a bunch of adapters but none of them are the same thread size as my ex:confused:

[Tweeked]

Are the 400ex and 300ex thread sizes the same?
I'd also like to know where to find one.

thanks