USEFUL DATA
Engine bore 82 mm
Engine stroke M20 94 mm
Engine stroke M21 112 mm
Engine Capacity 496cc
Petrol tank capacity 3 gallons
Oil tank capacity 5 pints
Gearbox capacity 1 pint
Inlet tappet clearance (cold) .010”
Exhaust tappet (cold) .012”
Compression M20 4,9:1
Compression M21 5:1
Tyres 3.25/3.50-19
Tyre Pressure 22psi
Piston ring gap .008 - .012”
Piston clearance Bottom of skirt .0035 - .0055”
Piston Ring side clearance .002" - .004"
Ignition timing 7/16” BTDC
Magneto point gap .012”
Spark plug gap .012 - .018”
Carburetter- Jet 170
Carburetter- Needle 2nd notch
Engine Sprocket 19 teeth
Clutch sprocket 43 teeth
Gearbox Sprocket 18 teeth
Rear Wheel Sprocket 42 teeth
Primary Chain 95 links
Gear Ratio- Top 5.3
Gear Ratio- 3rd 7.0
Gear Ratio- 2nd 10.9
Gear Ratio- 1st 15.8
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