First of all hello was on here years ago as liffy16 but I could not retrieve my account as my email had changed.
Anyway rebuilt my mc18 this winter had crank rebuilt by Steve at Gt, top end was ok just new rings.when first rebuilt after running in bike was flying and would rev clean up to redline.
Now though it won't rev past 10k checked float heights and there at 13mm even removed pump as I think keep valve is leaking,so now on premix at 30=1 anything else I can try regards colin