Remove the 17mm bolt and let the oil empty completely. Clean the magnetic tip of the drain bolt if applicable.
Remove the right-side engine clutch cover to access the mesh oil screen located at the bottom of the crankcase. Pull it out, clean it with brake cleaner, dry it with compressed air, and reinstall.
If the engine runs poorly or only with the choke engaged, the pilot jet is likely clogged. Remove the float bowl, unscrew the brass jets, and clear them using compressed air or dedicated carburetor cleaning wire. 4. Torque Specifications & Rebuild Tolerances 152fmh engine service manual
The 152FMH is one of the most reliable and widely produced horizontal single-cylinder engines in the world. This 110cc, four-stroke, air-cooled powerplant runs millions of pit bikes, ATVs, dirt bikes, and supercub motorcycles. Brands like Lifan, Loncin, Zongshen, and TaoTao rely heavily on this engine architecture.
The the engine is mounted on (ATV, pit bike, etc.) Share public link Remove the 17mm bolt and let the oil empty completely
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Adjust while the engine is warm until the engine idles smoothly at roughly 1500 RPM without stalling or engaging the automatic clutch. 5. Electrical System & Wiring Diagram Pull it out, clean it with brake cleaner,
Before performing any service work, verify your engine code. The code "" is stamped into the lower left crankcase, near the gear shift lever. Decoder Ring 1 : Single cylinder 52 : 52.4mm cylinder bore F : Natural air cooling M : Motorcycle/powersports application H : 110cc displacement class Technical Data Sheet Specification Engine Type Horizontal, Single-Cylinder, 4-Stroke, SOHC Displacement 107cc (commonly marketed as 110cc) Bore x Stroke 52.4 mm x 49.5 mm Compression Ratio 9.0:1 to 9.7:1 Cooling System Forced Air Cooled Ignition Type CDI (Capacitor Discharge Ignition) Spark Plug NGK C7HSA or A7TC (Gap: 0.6mm - 0.7mm) Clutch Type Wet multi-plate (Automatic Centrifugal or Manual) Transmission 3-Speed with Reverse, 4-Speed Manual, or Full Auto Engine Oil Capacity 0.8 Liters (0.84 US quarts) Recommended Oil SAE 10W-40 JASO MA/MA2 (Wet-clutch compatible) 2. Routine Maintenance Schedule
By maintaining clear fuel paths, ensuring proper oil lubrication, and strictly enforcing valve clearance limits, your 152FMH engine can reliably endure thousands of operating hours. Always use high-quality replacement gaskets and keep components clean during any internal tear-down procedures. If you need help diagnosing a specific problem, tell me:
Turn the pilot screw clock-wise until it gently bottoms out, then back it out 1.5 turns.