Single-cylinder, 4-stroke, air-cooled, OHV (Pushrod). Displacement: 149.4cc. Bore x Stroke: 62.0 mm × 49.5 mm. Compression Ratio: 9.2:1. Cooling System: Natural air cooling. Starter System: Kick starter and/or electric starter. Service Clearances & Tolerances Intake Valve Clearance (Cold): 0.05 mm (0.002 in). Exhaust Valve Clearance (Cold): 0.05 mm (0.002 in). Spark Plug Gap: 0.6 mm – 0.7 mm. Engine Oil Capacity: 0.9 Liters (1.0 Liter at disassembly).
Change engine oil, clean or replace air filter, clean spark plug and check gap. 162fmj Engine Service Manual
Because the 162FMJ uses a pushrod configuration rather than an overhead cam, checking valve clearances is straightforward but vital. Single-cylinder, 4-stroke, air-cooled, OHV (Pushrod)
Loosen the locknut. Turn the adjuster screw until there is a slight drag on a 0.05 mm feeler gauge. Hold the screw steady and torque the locknut to specification. Oil Strainer Cleaning Compression Ratio: 9