Gary, if it's a 650 xt your intake valves are set at 0.1016mm (0.004in) and your exhaust valves are set at 0.1524mm (0.006in). FYI- make sure you are on the compression stroke TDC when you set them.You should feel play in the valves if you are. If not you are on the intake stroke so rotate the crankshaft till it comes back up to TDC again and you should be there.Hope that helps.