OS Motors GF40 4-Stroke Gas Engine w/F-6040 Muffler

This is the O.S. Engines GF40 4-Stroke Gasoline Engine.

FEATURES:
Suitable for aerobatic or scale aircraft
Very same firewall mounting system as the O.S. GT33
Walbro carburetor witn integrated choke rod guide that streamlines
    setup, choke rod guide is integrated with backplate
Favorable Crankcase Ventilation (PCV) assists keep design and environment
    cleaner without blow-by gas and oil waste
Two year minimal warranty through Pastime Services beginning at date of
    purchase

CONSISTS OF:
GF40 4-Stroke Gasoline Engine, CM6 Spark Plug, Muffler, Ignition
    Module and Instructions

NEEDS:
2-cycle oil, see SPECIFICATIONS
Ignition Battery: 4.8-6.0V NiCd or NiMH, 6.6V LiFe or 7.4V LiPo pack
    LiPo battery requires voltage regulator
Prop: 18x8 for break-in, 18x8-12, 19x8-10 20x8-10
Installing standoffs, length depends upon aircraft
Gasoline safe fuel tubing and fuel filter

SPECIFICATIONS:
Displacement: 2.438 cu in (39.96 cc)
Bore: 1.57" (40mm)
Stroke: 1.251" (31.8mm)
Practical RPM Range: 1,800-9,000
Weight: Engine, 42.3oz (1200g)
Muffler, 4.0oz (113g)
Ignition Module, 3.4oz (95g)
Gasoline/Oil Mix: 30:1 - 50:1
    25:1 fuel/oil mixture if brand name of oil states 50:1 mix
Crankshaft Size: UNF5/16-24
Length from Backplate to Drive Center: 4.7" (118.5mm)
Length from Center of Crankcase to Drive Center: 3.1" (78.6mm)
Length from drive hub to end of Crankshaft: 1.6" (41mm)
Length from Carburetor to end of Crankshaft: 7.8" (197.6mm)
Height from Center of Crankshaft to Rocker Cover: 4.9" (126.7mm)
Height bottom of Crankcase/top of Rocker Cover: 6.2" (157.2mm)
Distance in between Vertical Mounting Hole Centers: 2.1" (54mm)
Distance in between Horizontal Mounting Hole Centers: 2.7" (70mm)
Width of Cover Plate: 3.3" (83.7mm)