hi kevinsr125 and oldgitonbike,thanks for your help,i"ve got a haynes manual coming next week,going to have a good read of that,im new to biking,but i"ve got the bug!!!!! pretty mechanically minded,so im going to have a go at sorting a few bits to the engine,eg.valve clearanses,the bike runs pretty good for its millage 30,500,but last owner has"nt looked after it,gave it a really deep clean,took wheels off and got em" sparkling!! took me 3 days,lots of rusty spokes!!! i was thinking of fitting a power air filter,would it make a difference and would the carb need adjusting,