If it is necessary to make adjustment, loosen the adjusting screw
lock nut © and turn the adjusting screw (3) so that the valve clearance
will offer a slight resistance when the thickness gauge is inserted. After
completing the adjustment, retighten the adjusting screw lock nut while
holding the adjusting screw, to prevent turning. Finally recheck the
clearance again to make sure that the adjustment had not been disturbed.
Note : The valve clearance must be checked when the engine is cold.
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