by dsrpilot » Wed Mar 30, 2011 7:14 am
Probably the adjustment of the valves or the cam chain.
Both are very easy to do if you have a few tools and a little mechanical ability or someone you know does.
'12 CRF450X - son
'09 CRF250X and 2010 F800GS lowered - Wife
'12 CRF250X and 2012 F800GS - me