Incorrect valve clearance causes hard starting, power loss, and premature valve burning. Always adjust valves when the engine is completely cold.
Use a socket wrench on the flywheel nut to rotate the engine .
Re-verify the clearance after tightening the locknut. Reassemble all covers. 4. Fuel System & Carburetor Tuning 152fmh engine service manual
Lubricate the piston skirts and cylinder wall with clean 4-stroke engine oil.
Measures 300–600 Ohms to ground.
Standard typically 0.6–0.7 mm (consult specific brand manual). Piston-Cylinder Clearance Service Limit: 0.090 mm. Rocker Arm Diameter Service Limit: 11.97 mm. Key Service Procedures Complete engine 110cc manual gearbox 152FMH 110 4T AC
Use a feeler gauge to set the gap and tighten the lock nuts. C. Carburetor Maintenance (152FMH-3 110cc) Incorrect valve clearance causes hard starting, power loss,
Re-torque the four cylinder head nuts in a criss-cross pattern across 3 separate increments until reaching 13 Nm .
Remove the right-side crankcase cover access cap to clean the internal oil screen mesh filter using parts cleaner. Re-verify the clearance after tightening the locknut
Hold the adjuster screw stationary while tightening the locknut. Recheck the clearance to ensure it did not shift during tightening. Oil Change and Screen Cleaning
Reinstall the drain plug and torque to 15 N·m (11 lb-ft) .
