wuts good psi for a stock 400ex

[speedfoxracing]

i,m goin to pull my plastics off and check the psi and wuts the ideal psi cause mine smokes and i think it needs a rebuild but i still want 2 make sure wut the psi is so plz let me know thanks.

for it to be in spec I believe it should be between 100 - 128PSI. Lower than that and you more than likely need a rebuild or your getting a leak on the tester.

[hornetgod13]

The engine must be warmed up before the compression test and the throttle must be held wide open when cranking.