I use the ROLL OVER METHOD
This is good to use if your not sure if the piston is at TDC [top dead center] or the timing marks on the fly wheel don’t line up with cam position, they rarely do!
This also takes in to account cam chain stretch ,worn cam lobes, cam gear or rockers especially in older motors with a lot of hours.
Remove spark plug. This make turning the motor over easy.
Rotate the motor CLOCKWISE at the flywheel.
Watch the rockers go through the cycle
Stop rotating when the INTAKE valve, the top one, is all the way open, rocker has pushed valve completely down.
In this position ,adjust the EXHAUST valve. Loosen the locking nut [9mm] and with a slightly oiled feeler gauge set the gap to whatever your motor spec. manual suggests.
Tighten locking nut and recheck for proper setting.
Again , rotate motor CLOCKWISE until EXHAUST valve is completely open, Rocker is fully down
Set gap on INTAKE valve
Tighten locking nut and recheck setting
Rotate motor through cycle again and confirm both settings.
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