well ive give the whole cylinder and kips a good decoke of carbon so ther all clean but its rattlin like hell is this something to worry about,they must of been bedded in carbon now that's gone,but how long would it run with them 3worn teeth in the l/h valves,would then not just crunch up eventually causing more damage or not,this bike is nearly 20yr old and never been looked after until now,i got the head n base skimmed the barrel honed and new piston and rings in and gaskets ,new carb kit ,it starts first time,ive been running it for 15minutes at a time letting cool down then doing it agen the following day just let the piston bed in abit ,the idol screw doesn't really work unless you ride it warm it up then tune the air screw and idol screw together ,im just wondering weather im gonna have to get a new valve kip kit and take the top end off again