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Useful data

Engine bore 82 mm  
Engine stroke M20 94 mm  
Engine stroke M21 112 mm  
Petrol tank capacity 3 gallons 13.64 liter
Oil tank capacity 5 pints 2.8 liter
Gearbox capacity 1 pint 0.6 liter
Inlet tappet clearance (cold) 0,010 in 0.25 mm
Exhaust tappet (cold) 0,012 in 0.30 mm
Compression M20 4,9:1  
Compression M21 5:1  
Tyres 3,25/3,50-19  
Piston ring gap 0,008-0,012 in 0.20-0.30 mm
Piston clearance 0,0035-0,0055 in 0.09-0.14 mm
Ignition timing 7/16 in BTDC 11.1mm BTDC
Magneto point gap 0,012 in 0.30 mm
Spark plug gap

0,012-0,018 in

0.30-0.45 mm
Engine sprocket      18  
Clutch sprocket          43  
Gearbox  sprocket     19  
Rearwheel sprocket   42   
Weight

Approximately 185 Kg