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Adjust the clearances in the following order: disconnect the crankcase ventilation hoses, remove the air filter, connect the carburetor throttle drive cable and the hose of the vacuum regulator of the ignition timing. remove the rocker cover (valve cover) set the piston of the first cylinder according to the mark to the TDC (top dead center) position and use a feeler gauge to check the clearances between the valves and rocker arms 1, 2, 4, 6. If the clearance is incorrect, use a feeler gauge and adjusting screw to set the correct clearance. Then, supporting with a screwdriver or wrench, tighten the lock nut and check the correctness of the clearance; turn the crankshaft 360% and adjust the clearances of the remaining valves (3, 5, 7, 8). The gap is measured only on a cold engine! #VALVE ADJUSTMENTUMZ417