162fmj Engine Service Manual (Plus ✮)
Most people change the oil but never remove the clutch cover to clean the mesh screen. The manual dedicates a full page to cleaning this screen every 6 months. A clogged screen starves the connecting rod bearing, leading to a seized engine.
Change engine oil, clean air filter, check spark plug condition.
End your repair or maintenance session by performing a final check on all oil levels and fasteners before starting the motorcycle. To help you further, please let me know: What specific is your engine currently showing? Are you planning a routine service or a complete rebuild ?
Performing regular, simple maintenance is the key to a long life for your 162FMJ engine.
Single-cylinder, 4-stroke, air-cooled, OHV (Pushrod). Displacement: 149.4cc 162fmj Engine Service Manual
The user-driven knowledge on forums is often more helpful than any factory manual, as it provides practical, real-world solutions.
Because the 162FMJ is a "clone" engine, finding a single "official" manual is tricky. Here is your sourcing strategy:
| Specification | Standard Value | Notes / Variants | | :--- | :--- | :--- | | | Single Cylinder, 4-Stroke, Air-Cooled, Vertical | CG-style engine design | | Displacement | 149.4 cc (approx. 150cc) | 62 mm bore; 49.5 mm stroke | | Compression Ratio | 9.0:1 to 9.8:1 | Varies by manufacturer (e.g., 9.8:1 for CBP150 version) | | Max. Power | 8.5 - 9.2 kW @ 8500 rpm | Up to ~12.3 hp (9.2 kW) for high-performance variants | | Max. Torque | 10.4 - 11.0 Nm @ 7500 rpm | High-torque version available (11.0 Nm) | | Bore & Stroke | 62.0 mm x 49.5 mm | Square, over-square design for good power balance | | Ignition | Capacitor Discharge Ignition (CDI) | Electronic, no moving parts, highly reliable | | Lubrication | Pressure / Splash | Combined system with oil pump for reliability | | Starting | Electric & Kick Start | Both systems present on most variants | | Transmission | 5-Speed, Manual, Wet Clutch | "1-down, 4-up" shift pattern on most bikes | | Oil Capacity | ~1.1 L (1100 ml) | 1.0 L to 1.3 L range depending on engine case |
Understanding the precise measurements of your engine is critical before performing any internal repair work. Engine Architecture Most people change the oil but never remove
The 162FMJ engine is a masterpiece of utilitarian engineering. It is not sophisticated, but it is precise. Every bolt has a torque. Every gap has a tolerance. Every oil change interval has a reason.
Insert a 0.05 mm feeler gauge between the valve stem and the rocker arm adjuster screw.
Single-cylinder, 4-stroke, air-cooled, OHV (Pushrod) Displacement: 149.4cc Bore x Stroke: 62.0 mm × 49.5 mm
Slide the cylinder barrel upward to expose the piston. Stuff a clean rag into the crankcase opening immediately to prevent the piston pin clips from falling inside. Change engine oil, clean air filter, check spark
When doing a top-end rebuild (replacing piston rings or cylinder gaskets) or splitting the cases to fix transmission gears, correct tightening torque is mandatory to avoid stripping threads in the aluminum castings. Critical Torque Values
The is critical here because generic 125cc or 250cc manuals will give you wrong torque specs, incorrect valve clearances (usually 0.05–0.07mm intake and exhaust), and misleading timing chain instructions.
Turn the square adjusting stem using valve adjustment pliers until you feel a slight, smooth drag on the feeler gauge.
Remove the three small Phillips-head screws holding the centrifugal filter outer cap.
