View Full Version : wuts good psi for a stock 400ex
speedfoxracing
06-13-2008, 01:53 PM
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
06-13-2008, 04:45 PM
The engine must be warmed up before the compression test and the throttle must be held wide open when cranking.
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