1 4. Disconnect: spark plug cap 1 5. Remove: spark plug 2 2 6. Remove: timing mark accessing screw 1 crankshaft end accessing screw 2 1 2 7. Measure: valve clearance Out of specification Adjust. Valve clearance (cold) Intake valve 0.09 ~ 0.13 mm (0.0035 ~ 0.0051 in) Exhaust valve 0.16 ~ 0.20 mm (0.0063 ~ 0.0079 in) MMM M M MMM M M MMM M M MMM M M MMM M M MMM M MMM a. Turn the crankshaft counterclockwise. b. When the piston is at the top dead center (TDC) on the compression stroke, align the “I” mark a on the AC magneto rotor with the stationary pointer b on the AC magneto cover. a b NOTE:
To position the piston at top dead center (TDC) on the compression stroke, align the “I” mark c on the camshaft sprocket with the stationary pointer d on the cylinder head, as shown in the illustration. d c 3 - 20 ADJUSTING THE VALVE CLEARANCE CHK ADJ