This is the O.S. Engines FS-95V Four Stroke Aircraft Engine. FEATURES: Broad power band for a wide variety of airplanes including models designed for .60 2-stroke and .90 4-stroke engines Redesigned cylinder head to match angled valve layout for steady power at all times and a perfect balance between high combustion and efficient cooling Redesigned "Jet Stream" muffler with unique shape for more authentic four stroke sound Same mounting dimensions, drive hub position and linkage position as the O.S. FS-91 Surpass II, 61FX, 65LA, 75AX, 95AX and FS-110 Two year limited warranty through Hobby Services beginning at date of purchase INCLUDES: O.S. Engines FS-95V Four Stroke Engine with Type F Glow Plug, Muffler Header Pipe with two Locknuts and Instruction Manual REQUIRES: Fuel: 5-20% nitromethane aircraft blend with 18% lubricant content Propeller: Sport & Aerobatic 13x7-9, 14x6-8 Scale 15x6-8 SPECS: Carburetor Settings- Needle Valve: 2-1/2 - 3 turns from fully closed Mixture Control Valve: Rotate until slotted head is flush with carb body. After setting needle valve, rotate mixture control valve approximately 45° clockwise to lean the mixture or 45° counter- clockwise to richen mixture Displacement: 0.951cu in (15.59cc) Bore: 1.142" (29.0mm) Stroke: 0.929" (23.8mm) Practical RPM: 2,100 - 11,000RPM Power Output: 1.7ps/10,000RPM Weight: 20.88oz (592g) Muffler Weight: 2.05oz (58g) Crankshaft Size: 5/16-24 Height from bottom of Mounting Tab to Pushrod Cover: 3.8" (97.5mm) Height from bottom of Crankcase to Pushrod Cover: 4.7" (119mm) Distance from Carburetor to Drive Hub: 4.5" (115.7mm) Distance/Mounting Hole Centers Same Side: 0.98" (25mm) Distance/Mounting Hole Centers Opposite Side: 2" (52mm) Mounting Hole Diameter: 0.16" (4.2mm) Distance from Drive Hub to end of Crankshaft: 1.5" (37.4mm) Distance from Drive Hub to center of Engine: 2.6" (66.5mm) Width at Mounting Tabs: 2.4" (61mm) Width Below Mounting Tabs: 1.7" (42.6mm) Height/Mounting Tab Bottom to center of Needle Valve: 0.70" (17.8mm) jxs 03/03/11 ir/jxs