Join Date: Jul 2003
Location: Sydney, Australia
Motorcycle: GSXR1100 WS
Re: Could low compression be tight valves
You should check the valve clearances. No clearance can mean that valve does not seat causing loss of compression on cranking. High clearance can mean bent valve with same effect. Burnt valves, same thing. It could also be a blown head gasket between 3/4, as both have low cranking pressures . . . look for gases coming out of the coolant overflow bottle while running, or in extreme cases there would be a lot of steam coming from the exhaust with that distinct coolant smell. Find someone with a cylinder leakage tester and they will be able to find the problem quickly.
Streetbike . . . GSXR1100WS, Yoshi RS3 pipe, Factory Pro jet kit. Hillclimb car . . . 1298cc SBM big block, Yoshi stage 2 cams, FCR41's, Dyna 2000, MTC lockup clutch, Geartronics paddle shifter. Circuit race car . . . currently 1118cc Wiseco Gixxer with Hahn turbo / Hilborn throttle bodies / Microsquirt EFI
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