|1) General data|
Engine: Single port, 496cc OHV single cylinder. Bore 82mm, Stroke 94mm.
Compression ratio 7.75:1 (Option of 12.5:1 with High Compression Piston)
Power output 29-30bhp @ 5,800rpm
Alloy cylinder head with cast-in bronze thread inserts, and screwed-in steel valve seats.
Alloy cylinder barrel with pressed-in steel liner
Valves: Inlet: length 4.21875in Head Dia 1.65625in Stem Dia 0.34375in
Exhaust: length 4.21875in Head Dia 1.59375in Stem Dia 0.375in
Ignition: Lucas MO1 Magdyno with manual advance. Ignition timing 7/16in BTDC on full advance