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
Install a new head gasket. Position the cylinder head and tighten bolts to the factory torque specification using the proper sequence. Key Service Tips Most 152FMH engines use 10W-40 4-stroke motorcycle oil (JASO MA2 compliant if it has a wet clutch). Valve Timing:
Armed with the knowledge of the service manual, Jack set to work on his van. He replaced the worn-out spark plugs, adjusted the timing belt, and even attempted to rebuild the carburetor. It was a daunting task, but with the manual as his guide, he felt like he could tackle anything.
10W-40 JASO-MA (Ensure it is wet-clutch compatible). Carburetor Tuning Most 152FMH engines use a PZ19 or PZ22 carburetor. Idle Speed: 1,500 ± 100 RPM. 152fmh engine service manual
It is important to note that the 152FMH is produced by several different manufacturers in China, including Loncin, Lifan, Zongshen, and others. This means there can be slight variations in specifications, power output, and component design. However, as they all share the same basic CG125 lineage, most parts and procedures are interchangeable.
Check the kill switch first, then the CDI box and stator resistance.
The 152FMH is a widely used , typically found in Chinese-manufactured pit bikes, ATVs, and small motorcycles like those from Lifan, Taotao, and Zongshen. Before performing any service work, verify your engine code
The 152FMH is typically paired with a . Performance issues are almost always caused by clogged internal jets. Standard Carburetor Settings Pilot Jet (Idle Jet): #32 - #35 Main Jet: #75 - #82
If either circuit shows an open loop (infinity) or zero resistance, the stator assembly must be replaced.
Change the oil after the first 5 hours of operation to remove manufacturing debris and metal shavings. Routine Maintenance Schedule Install a new head gasket
12–14 Nm (8.8–10.3 ft-lbs) applied in a star pattern. Cylinder Head Side Bolt (M6): 10 Nm (7.3 ft-lbs). Flywheel / Rotor Nut: 40–45 Nm (29.5–33.1 ft-lbs). Clutch Hub Locknut: 42 Nm (31 ft-lbs). Camshaft Sprocket Bolts (M5): 9 Nm (6.6 ft-lbs). 5. Troubleshooting Matrix Probable Cause Corrective Action Engine will not start
This guide serves as a comprehensive service overview for those seeking the essentials, covering everything from routine maintenance to internal specifications. 1. Engine Specifications & Identification