Hi there, wonder if anyone could help me i have a knocking noise coming from the engine, i have been told it may be main crank bearing or piston slap and been quoted

have alook at the existing forums re beta engine problems, are you sure it's not simply pinking.. does it knock as you "snatch" throttle open . I .ve just rebuilt mine and put some notes for others to benifit from my experiences (click box 2 on main bearings I think),got it going today i's not a bad job worst bit is putting cycle parts back together.