[chirpy]

Hi -- i'm currently running a zx9b motor in a 1 off chassis with a 953cc big bore with ported & flowed head -- big cams 39mm flatslides Dyna ignition and a big fugoff snot of nitrous -- running some decent quarter times but suffering from spitting shims out only when i use gas and only on the exhaust side -- tried dropping the rev limit but that's not helped -- struggling to find h/d valve springs over here in the UK -- any one out there know where i can get a set

cheers
Chirpy

 

[chirpy]

The ZX7r motor usues shim under bucket -- mine has rockers -- don't know about the early ZXR750 ones though ( they don't call it the ZXR over there do you) what year did they change to shim under bucket

cheers