162fmj Engine — Service Manual
Excessive valve clearance or worn rocker arm bushings.
Ensure there is slight play in both rocker arms. If they are tight, rotate the crankshaft 360 degrees and realign the "T" mark.
The 162FMJ engine is incredibly forgiving, but it requires regular intervention to prevent premature wear. Follow this standard timeline to keep the engine in peak condition: 1. Every 1,000 km (or 600 miles)
Inspect the spark plug for fouling. Check CDI unit connections, ignition coil ground, and pickup coil resistance (typically 110–150 ohms). 162fmj Engine Service Manual
Measure the cylinder bore for taper and out-of-roundness. Check piston ring end gap. If the bore exceeds service limits, it must be rebored or replaced.
Regular service intervals are critical for preventing premature wear on air-cooled engines, which run hotter than liquid-cooled counterparts. Action Required Check and adjust drive chain tension; lubricate. Every 1,000 km
Incorrect clutch lever freeplay, worn friction plates, or use of automotive engine oil containing friction modifiers. Excessive valve clearance or worn rocker arm bushings
Clogged carburetor jets, blocked fuel petcock, or vacuum leaks.
Because it uses a pushrod system instead of an overhead camshaft (OHC), it requires specific maintenance techniques. This comprehensive service manual provides the technical specifications, step-by-step maintenance routines, and troubleshooting procedures needed to keep your 162FMJ engine running perfectly. 1. Specifications and Technical Data
Remove the cylinder to inspect for scoring or wear ( Piston Rings: Replace rings if excessive smoke is present. Clutch Replacement Side Case: Remove the right-side engine cover. The 162FMJ engine is incredibly forgiving, but it
Drain the oil and remove the exhaust, carburetor, and cylinder head cover. Remove the timing chain tensioner and the cylinder head bolts to lift the cylinder head off the block.
Clean the mesh screen thoroughly using solvent or brake cleaner and blow dry with compressed air.
Single-cylinder, 4-stroke, air-cooled, OHV (Pushrod). Displacement: 149.4cc