This is the O.S. Max 1.60 FX High-Performance R/C Engine used for Sport and Aerobatic Aircraft. This 1.60 FX is Designed to use a Muffler or Tuned Pipe. FEATURES: One-piece crankcase Twin ball bearing-supported crankshaft Schnuerle porting (Schnuerle scavenging) Steel liner and ring with Aluminum piston Tall, squared heat sink head for added cooling Engineered for low fuel consumption and tight installations. Side exhaust with muffler with rotatable exhaust outlet. Wide wing- shaped exhaust port contributes to higher torque at lower rpm. Extra long crankshaft & jam nut w/prop washer to secure the propeller #60F Carburetor with remote needle mounted on the backplate of the engine (to keep fingers away from the spinning propeller). The remote needle valve can be mounted three ways: vertical, horizontal, and separate from the engine. Two year warranty INCLUDES: One Assembled 1.60 FX Ringed R/C Airplane Engine, #60F Carb, smaller nut for APC props and 3/8-24 safety lock nut One exhaust adaptor One remote needle valve One 77mm (3") clear fuel tubing for remote needle Two 5 x 15mm cap head adapter mounting screws Two 5 x 19mm cap head muffler mounting screws One 4mm allen wrench One expansion style muffler (E-5010) with screws One illustrated instructions booklet w/parts list and O.S. decal One O.S. #8 glow plug (OSMG2691) REQUIRES: Fuel with 18% (minimum) lubricant content and 5% to 25% Nitromethane (Can be flown on FAI fuel, which is 0% Nitro) SPECS: Displacement: 26.23cc (1.60 cu in) RPM range: 1,800 - 10,000 RPM Bore: 33.6mm (1.32") Stroke: 29.6mm (1.17") Weight: Engine- 1235g (43.6oz) with muffler Muffler: 275g (9.7oz) Horsepower: 3.7 PS, 3.65 HP at 9,000 RPM Length: 115.5mm (distance from the backplate screw to drive washer) 30mm (distance between centers of the mounting holes) Width: 51.5mm (width of engine neglecting engine mounting flanges) 62mm (distance between centers of the mounting holes) Exhaust mounting screws width (center to center): 42mm (1.65") Height: 123.2mm Crankshaft Thread Size: 3/8-24 Crankshaft Length (drive washer front to crankshaft front): 42mm Crankshaft Threaded Area: 28mm Suggested Props: Aerobatic: 15x12-14, 16x10-14, 16.5x10-13 Sport: 17x10-13, 18x10-12 Needle Settings: High Speed: 2 - 2.5 turns out from fully closed Low Speed: .75 turns out from fully closed with the throttle fully closed COMMENTS: Recommended is a 450-550cc fuel tank which allows approximately 10 to 12 minute flights. Locate the fuel tank so that the top of the tank is 5-10mm (1/4-3/8") above the level of the needle valve. A 1/16" wire (not included) can be used to extend the needle valve by inserting the wire into the pre-drilled hole on the end of needle valve and tightening it in place with the supplied set screw. Remote needle valve is held in place by a nut instead of screws. To use a Tru Turn spinner and an APC propeller, modeler will need the Tru Turn jam nut set TT-0378-A (not carried at this time). MAF 5/23/00 ir/jl updt lmm 3/31/09