Valve Clearance Adjustment
Remove valve cover and turn crankshaft so that No. 1 cylinder is at TDC on firing stroke. Assure that engine temperature is cool (max. 95°F, 35°C) and use feeler gauge to check clearance between valve and adjusting eccentric. Clearance for both intake and exhaust valves should be 0.010 - 0.012" (.25-.30 mm). To adjust clearance, loosen nut on rocker arm and rotate eccentric.