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

• Fuel: 5-20% nitromethane aircraft blend with 18% lubricant content
• Propeller: Sport & Aerobatic 13x7-9 14x6-8 Scale 15x6-8

Specifications:

• 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)