Hi

Ive been having trouble recently with my cylinder head o rings and thought whilst I had the head off id put a new set of rings and little end bearing in the bike to freshen it up abit. Its a 2010 gasgas pro 300 racing thats probably got around 800hrs on it minimum.(4hrs per weekend 52 weekends a year x4) and was wondering would I need to have the piston replaced and barrel replated or not? The piston looks pretty good, only has a slight amount of black around one part of the piston and the barrel has no dark or grey patches or any lips or markings so would you put a new piston and get the barrel replated or not?

Edited May 22, 201412 yr by coxy

I wouldn't personally, but GG UK should be able to give you the clearances so you can measure things and decide. But you'll probably get away with quite bit more wear than the theoretical max.

If it don't rattle put new rings and ride on!

Thanks for the replies

I did think that having it replated seemed abit excessive to say it's only a 2010 bike which ive owned from new and its not been thrashed or anything. The bike sounded sweet as a nut before I took the head off so can't see any reason why I would need to do anymore apart from put new rings in it