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	19
Engine sprocket with sidecar	17
Clutch sprocket	43
Gearbox sprocket	18
Rearwheel sprocket	42
Weight	Approximately 185 Kg