O.S 55 AX ABL aircraft / ariplane engine w/Muffler NIB

This is new in box O.S. Max .55 AX ABL Aircraft Engine with Muffler. It has more power than those .46 size engine but with same mounting dimensions.

FEATURES: *Same mounting dimensions as the O.S. Max .46 AX
                       *Advanced Bi-Metallic Liner process uses a double layer of plating
                        material rather than one thick layer. This helps the metal bond to
                        the cylinder and makes the plating more durable. Also, the plating
                        process is more consistent, resulting in a more precise fit between
                        piston and sleeve for better compression and longer life.
                      *Angular head design offers increased surface area for better cooling
                      *Ball bearing-supported crankshaft
                      *40J carburetor with diagonally placed needle valve eliminating remote
                         needle valve placement
         
INCLUDES: O.S. Max 55 AX ABL Aircraft Engine with Muffler, 40J carburetor,
                       #8 glow plug, illustrated instruction manual, 3.5" (90mm) long
                        needle valve extension cable and two 3x35mm muffler screws
REQUIRES: Aircraft blend fuel containing 5%-20% Nitromethane with at least 18%
                       lubricant

SPECS:    Displacement: 0.545 cu in (8.93cc)
                 Bore: .906 in (23mm)
                 Stroke: 0.846" (21.5mm)
                 Practical RPM: 2,000-17,000
                 Power Output: 1.75 ps/16,000 RPM
                 Weight: 14.25oz (404g)
                 Recommended Props: 12x7-8, 13x6-7