OS Motors .75AX ABL 61A Carb E4040 Muffler

This is the O.S. Max 75 AX ABL Aircraft Engine with Muffler.

FEATURES:
Same mounting dimensions as the O.S. Max .61FX
Advanced Bi-Metallic Liner procedure utilizes a double layer of plating
    product instead of one thick layer. This assists the metal bond to
    the cylinder and makes the plating more resilient. Likewise, the plating
    procedure is more consistent, resulting in a more accurate fit in between
    piston and sleeve for much better compression and longer life.
Power Box muffler style supplies more volume for increased power in
    a very compact shape
Angular head style uses increased area for much better cooling
Ball bearing-supported crankshaft
61A carburetor with diagonally placed needle valve eliminating
    remote needle valve positioning
Two year limited service warranty

INCLUDES:
O.S. Max 75 AX ABL Aircraft Engine with E3010 muffler, carburetor,
    #8 radiance plug, showed user's manual

NEEDS:
Aircraft mix fuel containing 5%-20% Nitromethane with a minimum of 18%
    lube

SPECS:
Displacement: 0.75 cu in (12.3cc)
Bore: 1.02" (25.8mm)
Stroke: 0.93" (23.5mm)
Practical RPM: 2,000-16,000 RPM
Power Output: 2.4 PS, 2.37HP/15,000 RPM
Weight: 20.39 onuces (578g) w/o muffler
26.46 ounces (750g) w/ muffler
Advised Props: 14x6, 14x8, 15x7
Crankshaft thread size: 5/16-24
Distance from center of engine to own hub: 2.62" (66.6mm)
Distance in between exhaust bolt mounting holes 42mm
Height from crankcase bottom to top of cylinder head: 4.07" (103.5mm)
Height/crankshaft center to top of cylinder head: 3.20" (81.5mm)
Width consisting of mounting tabs: 2.4" (61mm)
Width not consisting of mounting tabs: 1.67" (42.6mm)
Width in between mounting holes same side: .98 (25mm)
Width in between mounting holes opposite side: 2.04" (52mm)
Diameter of muffler body: 1.92" (48.8mm)
Angle of muffler in relation to engine: 4°
Length from end of crankshaft to back of crankcase 5.09" (129.5mm)

High Speed Needle: 1.5 - 2 turns out from totally closed
Low Speed Needle: 2mm space in between the needle and spray bar at complete
throttle (looking down the neck of the carb)