4 cylinder, petrol, bore and stroke 52mm – 67mm

Cubic capacity 570cc

Brake horse power 13 (side valve engine)

Brake horse power 16.5 (over head valve engine 500c)

Firing order 1-3-4-2

Valve clearance 500A inlet .004"

exhaust .008"

Valve clearance 500c inlet .004"

exhaust .004"

Contact breaker gap .018" - .021"

Engine and filter 4 pints

Gearbox 11/2 pints

Rear axle 11/2 pints

Cooling system 8 pints

Petrol tank 4.6 gallons

15" – 4" pressure 21lbs. Per sq. in.