Engine Stroke. . . . . . . . . . . . . 94mm
Engine Capacity (c.c.). . . . . . .496c.c
Petrol Tank capacity. . . . . . . . 3 gallons
Oil Tank capacity. . . . . . . . . . 5 pints
Gearbox capacity... 1 pint (approx.)
Tappet clearance (cold)-
Inlet. . . . . . . ..010"
Exhaust. . . . . .012"
Compression ratio. . . . . . . . . . .4.91
Tyres. . . . . . . . . . . . .. . . . 3.25-19"
Engine Sprocket. . . . . . . . . . . . 19 teeth
Clutch spocket. . . . . . . . . . . . . 43 teeth
Gearbox Spocket. . . . . . . . . . 18 teeth
Rear Wheel Spocket. . . . . . . . 42 teeth
Piston Ring gap. . . . . . . . . . . . 008"/.012"
Piston Ring side clearance. . . . .002"/.004"
Bottom of skirt. . . . . . . . . . . . . .0035"/.0055"
Gear Ratios-
Top. . . . . . . . . . . . . . . . . . . . . . 5.3
3rd. . . . . . . . . . . . . . . . . . . . . . . 7.0
2nd. . . . . . . . . . . . . . . . . . . . . . 10.9
1st. . . . . . . . . . . . . . . . . . . . . . . 15.8
Ignition setting (inches before
T.D.C fully advanced) . . . . . . . . . .7/16"
Contact breaker gap. . . . . . . . . . . .010"-.012"
Spark Plug (K.L.G .F70) gap. . . . . 018"-.020
Carburetter-
Jet. . . . . . . . . . . . . . . . . . . . . . . . . .170
Needle.. . . . . . . . . . . . . . . . . . . . . . 2nd notch
Primary Chain. . . . . . . . . . . . . . . . . .95 links
Source: http://web.archive.org/web/20010309091125/http://www.btinternet.com/~m20/m20.html
