Translations:KAVAN S15-S180A/R FS30-FS180AR - Instruction Manual/74/en

Attention: The valve clearance is to be adjusted only on a cold engine.

1. Remove the valve rocker cover after loosening the two socket screws
2. Rotate the engine twice counter clockwise and enjoy the movement of the valves. Continue turning the propeller counter clockwise until you feel compression, then turn it another 1/4 turn. Both valves should be just closed and the piston at the top dead centre (TDC).
3. The correct clearances are between 0.04 mm and 0.10 mm between the rocker arm and the valve. A 0.04 mm feeler gauge (the thinner one) can be inserted, a thicker one (0.10 mm) cannot.
4. If the gap is narrower than 0.04 mm or wider than 0.10 mm, carefully loosen the lock nut on the rocker arm with a 5 mm wrench; turn the adjusting screw to increase the clearance about half a turn counter clockwise. Insert 0.04 mm feeler gauge between the rocker arm and the valve and gently screw the adjusting screw (clockwise) until it hits the feeler gauge.
5. Tighten the lock nut again. Remove the feeler gauge, crank the engine a few times and check the valve clearance again
6. Finally, screw the valve cover back on.