162fmj Engine Service Manual May 2026
The 162FMJ engine is a ubiquitous 150cc, single-cylinder, 4-stroke, air-cooled powerplant based on the classic Honda CG150 overhead valve (OHV) design. It is widely used in Chinese-manufactured motorcycles like Lifan, Zongshen, and various street/dirt bikes. 1. Technical Specifications Key engineering data for the standard 162FMJ configuration: Engine Type: Single-cylinder, 4-stroke, air-cooled, OHV. Displacement: (Commonly cited as ). Bore x Stroke: . Compression Ratio: . Max Power: at . Max Torque: at .
Ignition: CDI (Capacitor Discharge Ignition) with D8TC spark plug. Transmission: 5-speed manual (constant mesh). Starting System: Electric and Kick start. 2. Routine Maintenance Schedule 162fmj Engine Service Manual
Frequent servicing ensures longevity for this air-cooled unit. The 162FMJ engine is a ubiquitous 150cc, single-cylinder,
Step 1: Preparation
- Download the correct PDF (Look for "Zongshen 150cc Service Manual" or "Lifan 162FMJ Manual").
- Set your torque wrench to the value specified for the cylinder head bolts (e.g., 22 Nm).
- Drain the oil (Capacity: 1.0 liter when dry, 0.9 liter on refill).
3. Piston Ring End Gap
One of the most common DIY mistakes is assuming rings fit perfectly. The service manual provides the allowable ring end gap for the 162FMJ: Step 1: Preparation
- Top ring: 0.10mm – 0.25mm
- Second ring: 0.10mm – 0.30mm
- Oil ring: 0.20mm – 0.70mm
Chapter 2: Troubleshooting
This flow-chart section is gold. It guides you through:
- Engine won't start: Spark -> Fuel -> Compression (in that order)
- Low compression: Check valves, head gasket, piston rings.
- Engine knocks: Connecting rod big end bearing wear or incorrect octane fuel.
Step 5: Checking the Timing Chain (Cam Chain)
Though an OHV engine has a short chain driving the cam from the crank. The manual specifies that the cam chain tensioner (automatic or manual) must be reset. Failure to do this causes the infamous 162FMJ "rattle."
