hi there samD

to be honest i think it would be a real shame to get rid of such a beautiful engine,
i recon you should send the engine back to ys at there service department and have it serviced they do this free of charge cos they stand behind there engine that much and to spend the best part of £250 on an engine and then to get rid of it is a real shame im running a 63 on my extreme lite and have been experiancing troubles with it but nothing a good service should fix just a theory but have you adjusted the tappet clearnce and are the valves in perfect sic with tdc?

update me