This is the O.S. Max .55 AX ABL Aircraft Engine with the E3071 Muffler. FEATURES: Same mounting dimensions as the O.S. Max .46 AXII 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 40K Carburetor with diagonally placed needle valve eliminating remote needle valve placement Two year limited warranty through Hobby Services beginning at date of purchase INCLUDES: O.S. Max 55 AX ABL Aircraft Engine with E-3071 Muffler, 40K carburetor, #8 glow plug, illustrated instruction manual, 3.5" (90mm) long needle valve, extension cable and two 3x35mm muffler screws
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