what is your compression measure in PSI ?

[Daver]

i got 170psi on my brothers 10:1 426EX
and 230psi on my 11:1 426EX with thinner head gasket
is this too high ? is it still reliable ?is 102octane enough ?

how is it on a 400ex 12: ou 13:1 ?

[2004exrider]

As long as its 11:1 you can still run 93 octane. But if it ever starts "knocking" then i'd suggest using a higher octane fuel. Figured i'd just chime in on that part, im not really to sure what 12 or 13:1 should read:macho

Jimmy

[300ex mxracer]

240 psi,11.1 on a 300. i run 50/50 93+110 because i was gettin a little knock.

[Daver]

thanx, anybody else?