: Procedures for servicing the centrifugal clutch and inertia-activated brake. Engine Work
| Component | Specification | | :--- | :--- | | | 121.6 cc (7.4 cu in) | | Cylinder Bore | 54 mm | | Piston Stroke | 54 mm | | Spark Plug | Bosch WSR 6 F or NGK BPMR 7A | | Electrode Gap | 0.5 mm (0.020 in) | | Fuel Mix | 50:1 (2% high quality 2-stroke oil) | | Idle Speed | 2,500 RPM | | Max Speed | 9,500 RPM (do not exceed 10,000) | | Chain Pitch | .404" or 3/8" (manual covers both sprockets) |
: Procedures for tuning the adjustable oil pump and cleaning the fuel system.