Fitment: Engine suitable for 49CC 2 Stroke Pocket Bike, Mini Dirt Bike, ATV or Scooter. Specifications: Cylinder Numbers: Single cylinder Displacement: 49CC Stroke: 2-stroke Bore: 44mm/1.7'' Chain: 25h Gas-oil Mix Rate: 25:1 Gear Box Reduction Rate: 3.1:1 Cooling: Air Forced Cooling Spark Plug Size: L7T L7TC Start Way: Recoil pull start, new style recoil, easy to pull start Recoil Starter Material: New style easy pull starter Application: for most air cooled mini dirt bikes Package size: 34cm x 25cm x 15cm (13'' x 10'' x 6'') Shipping weight: 3.4kg/7.5lbs Features: 49CC mini motor air cooled racing engine capable of achieving 40mph dependant on user weight and terrain. Engine is complete with high performance cylinder head, plug, powder coated metal pull start, air filter and 14mm carburettor,Balanced crank, balanced flywheel, ported piston windows, uprated CVT transmission unit. For 49CC 2 Stroke Pocket Bike, Mini Dirt Bike, ATV or Scooter Package includes: 1 x Complete Engine