: Step-by-step instructions for disassembling the engine, inspecting parts, replacing or repairing damaged or worn-out components, and reassembling the engine.
Valve clearances are too wide. Readjust to 0.05 mm.
Remove the right-side crankcase cover. Locate the circular oil filter cap on the crankshaft.
Faulty spark plug, bad ignition coil, or defective CDI unit. 162fmj Engine Service Manual
Reinstall the screen (tapered end facing inward), spring, and cap. Torque to 15 N·m. Carburetor Tuning & Cleaning
This engine is incredibly versatile and appears in hundreds of motorcycle and ATV models from dozens of brands. It is the heart of many bikes from:
: This includes detailed drawings, diagrams, and technical information necessary for performing repairs and adjustments. Remove the right-side crankcase cover
The manual instructs you to remove the two 6mm bolts, then use a plastic scraper (never metal) to remove the old gasket. Note the orientation of the breather hose.
Turn the screw in or out 1/4 turn at a time until you find the highest, smoothest idle speed.
The 162FMJ uses a pushrod system, which generally requires more frequent adjustments than OHC engines. Reinstall the screen (tapered end facing inward), spring,
| Parameter | Value | |-----------|-------| | Displacement | ~124–125 cc | | Bore × Stroke | 62 × 49.5 mm (common) or 62 × 52.9 mm | | Compression ratio | 9.0:1 to 9.5:1 | | Valve clearance (cold) | 0.05 mm (IN) / 0.08 mm (EX) | | Spark plug | A7TC (NGK C7HSA) — 0.6–0.7 mm gap | | Oil capacity | 0.9–1.0 L (10W-40 or 15W-40) | | Idle speed | 1400–1500 RPM | | Primary kick start + electric start | Yes | | Transmission | 4-speed (N-1-2-3-4) semi-auto or manual |
Insert a 0.05 mm feeler gauge between the valve stem and the rocker arm adjuster screw.
Because the 162FMJ is a direct evolution of the engine, a service manual for the CG125 is an excellent substitute. Almost all internal procedures—valve adjustments, top-end rebuilds, cam timing, and clutch repairs—are effectively identical.