What are the main differences? I can't be sure that my engine originated in the frame - the bike (which is an MC16) has an MC18 swingarm/wheel. I think I read somewhere that the MC16 didn't have a TPS, but mine does. I'm looking to get the cylinders re-plated and buy new pistons - are the pistons specific to the MC16/18 respectively, or did they use the same part nos?

Thanks for any help!

Ian.