This is the ASP-FS70AR Four-Stroke Model Airplane Engine.

FEATURES: Dual ball bearing-supported crankshaft
Choke system for easy starting
CNC precision machining
Steel cylinder liner and ringed piston for long life
Rear-mounted updraft two needle valve carburetor

INCLUDES: One ASP-FS70AR Four-Stroke Model Airplane Engine with: parts list, English Version of the Magnum instruction manual, muffler and header, allen wrenches, and pressure tubing.

REQUIRES: Glow plug: Four-stroke glow plug only.
Fuel: Recommended by manufacturer, 10% nitromethane with 20% castor oil for break-in, no more than 15% nitromethane and no less than 16% castor oil after break-in.
Propeller: 12x7-8, 13x5-8, 13x6, 14x5, 14x6.

SPECS: Bore: 25.8mm
Stroke: 22mm
Displacement: .70 cu in
Practical rpm: 1,800-11,000
Normal rpm: 9,500-9,600
Weight: 21.2oz
Prop Nut Size: 5/16-24
Length: 85.7mm (3.37") (from backplate to front of drive washer)
Length: 122mm (4.80") (from backplate to front of crankshaft)
Height: 118mm (4.64") (from bottom of engine to top of head)
Width: 50mm (1.96") (mounting hole centers-side to side)
Width: 20mm (.78") (mounting hole centers-front to rear)
Width: 39.9mm (1.57") (crankcase width neglecting mounting flanges)