Because the 162FMJ uses a pushrod (OHV) design, valve clearances tighten over time. This causes hard starting or loss of power. Always adjust the valves when the engine is completely cold.
Single-cylinder, 4-stroke, air-cooled, OHV (Pushrod). Displacement: 149.4cc
Because the 162FMJ uses a pushrod configuration rather than an overhead cam, checking valve clearances is straightforward but vital.
This comprehensive service manual provides the essential technical specifications, maintenance procedures, and troubleshooting steps required to keep your 162FMJ engine running at peak performance. 1. Engine Specifications & Technical Data
Intake and exhaust valves should be set to 0.05mm to 0.08mm (cold). 162fmj Engine Service Manual
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Drain from the left-side bottom plug; clean the reusable oil screen located behind the large cap on the right bottom.
Are you dealing with a right now (like low compression, bad clutch, or no spark)?
For visual learners, this Motorcycle Engine Rebuild video demonstrates a full disassembly of the CG-type engine cases, cylinder head, and transmission. Service Tip Because the 162FMJ uses a pushrod (OHV) design,
Performing regular, simple maintenance is the key to a long life for your 162FMJ engine.
SAE 10W-40 or 15W-50 (API Service SE, SF, or SG) Valve & Cylinder Tolerances Intake Valve Clearance (Cold): 0.05 mm to 0.07 mm Exhaust Valve Clearance (Cold): 0.05 mm to 0.07 mm Cylinder Compression: 1000–1400 kPa (145–200 psi)
While different manufacturers produce variants of the 162FMJ, the core specifications remain consistent across most models.
Locate the large 24mm drain cap on the bottom-left side of the crankcase. Single-cylinder, 4-stroke, air-cooled, OHV (Pushrod)
5-Speed Constant Mesh (1-N-2-3-4-5 or All-Up/All-Down depending on application) Starter System: Kick and/or Electric Starter 2. Routine Maintenance Schedule
: Valve clearance too tight (valves staying slightly open, losing compression). Fix : Check and adjust valve clearance to 0.05 mm. Cause : Choke cable broken or misadjusted. Fix : Verify the choke butterfly valve closes fully. Issue 2: Blue Smoke from Exhaust Cause : Worn valve guide seals or worn piston rings.
In conclusion, the is the silent partner in every successful repair. It transforms a heap of greasy components into a predictable, restorable machine. It respects the engine’s original design tolerances while providing the flexibility to diagnose real-world failures. For the professional mechanic, it is a reference bible. For the hobbyist, it is a teacher. And for the engine itself, the manual is the only thing standing between a long, useful life and an early, violent death. To work on a 162FMJ without its service manual is not mechanical work—it is archaeology. With it, it is engineering.