This is the O.S. .35AX ABL Model Airplane Engine with E-3080 Muffler. Ideally suited to a variety of R/C aircraft including trainer, sport types. FEATURES: Same mounting dimensions as the O.S. .32SX and .25FX Weighs only 0.35oz (10g) more than the .32SX Advanced Bi-Metallic Liner. This process uses a double layer of plating material rather than one thick layer. This helps the metal to bond to the cylinder and is more durable. Also, the plating process is more consistent, resulting in a more precise fit between piston and sleeve for better compression, longer life. Newly designed E-3080 Power Box muffler generates mild and pleasant sound and is constructed with an O-ring between the front and rear body to prevent oil leaking and is fully positionable 21K carburetor with needle valve angled toward rear of engine for safer adjustments Ball bearing-supported crankshaft Two-year limited warranty INCLUDES: One O.S. Max .35AX ABL BB model airplane engine with muffler, #8 glow plug, two 3x28mm cap head muffler screws, needle valve extension cable, warranty sheet, decal sheet and illustrated instruction manual REQUIRES: Fuel containing 5%-20% nitromethane with at least 16% lubricant SPECS: Displacement: 0.352 cu in (5.77cc) Bore: 0.795" (20.2mm) Stroke: 0.709" (18.0mm) Practical RPM: 2,500-17,000 Output: 1.3 PS, 1.28 HP @ 16,000 Weight: 12.8oz (363g) with muffler Recommended Propellers: 10x6, 10x7, 11x6, 12x6 (10x6 for break-in) Crankshaft Size: 1/4-28 Distance from center of engine to drive hub: 2.1" (53mm) Distance from center of engine to end of crankshaft: 3.1" (77mm) Distance/crankshaft center to muffler exhaust outlet: 3.8" (96.2mm) Height from crankcase bottom to top of cylinder head: 3.02" (76.9mm) Height/mounting tab to top of cylinder head: 2.4" (61.5mm) Width including mounting tabs: 1.8" (45mm) Crankcase width below mounting tabs: 1.2" (30.6mm) Width between mounting holes same side: 0.59" (15mm) Width between mounting holes opposite side: 1.5" (38mm) Diameter of muffler body: 1.2" (32mm) Needle Settings: High Speed: 2 turns out from fully closed Low Speed: Flush with carb body then 1/2 turn in jxs 06/09/08 ir/jxs updt lmm 3/31/09