83rx-s100

hi, It does not have a rev counter because the old one broke (one of the bolts at the back snapped off). I put a carb on that came off a more recent bike and coleaned it up and set all of the settings to the manual. This morning i changed the reeds but the problem has not gone. I am wondering on weather to run it on premix =/ Do you know if the engine has a way of stopping its self from revving past 9000rpm because this may be set wrong ie only revving to about 6000? Thanks

hey there, Ive just finished rebuilding my rxs100 and it does not seen to rev high enough. It does not have a rev counter on it but there is obviously a problem. When i rebuilt the engine I replaced all engine bearings and seals, all the rest seemed in good condition. I am wondering if reboring the the cilinder head and replacing the piston, rings and pin would solve the problem. I have already changed the carb and fettled with it. It just does not seem to have any power because im not hitting the power band as it is not revving high enough. Any help please?