How Do set the Valve timing on your 1986 Yamaha TT 225?

Answer 1

The valves open and close as the cam goes round and round. On the flywheel there is a mark, and a viewing hole in the case. On the cam gear there should also be a mark. When the cam lobes are down the mark on the cam gear should line up with the mark in the top of the head and the mark on the flywheel should be in line with the viewing hole. If that's good then your good, unless your valves are misadjusted...on top of the valves there is a threaded rod with a square tip, that adjusts the valve. get a manual if your going to start messing with that, if its off your timing will be off and you'll most likely whack the piston or ruin the valves