O.S #18510 - OS 91RZ-H DH Ring Engine w/60M-C Carb.  [OS-18510]

This is actually the O.S. Max .91 RZ-H DH Back Exhaust Helicopter Engine. Fresh in Box

Features:

• Diecast cylinder mind
• Designed for Hirobo and also other scale helicopters in which motor must fit inside canopy to protect heli's scale lines
• Ringed piston
• 60M-C 3-needle carburetor with mid-range needle for accurate corrections

Includes:

• O.S. Max .91 RZ-H DH back Exhaust Helicopter motor with #8 radiance plug, instruction manual

Specs:

• Displacement: 0.912 cu in (14.95 cc)
• Bore: 1.091" (27.7mm)
• Stroke: 0.976" (24.8mm)
• Practical RPM: 2000-16,000
• Energy manufacturing: 3.3 ps @ 15,000 RPM
• Body weight: 22.0oz (623g)
• Crankshaft Size: 5/16-24
• Distance Between Mounting Holes exact same part: 0.98" (25mm)
• Distance Between Mounting Holes Opposite Side: 2" (52mm)
• Distance From straight back Plate to Front Bearing: 3.3" (83.8mm)
• Distance From right back Plate to Crankcase Center: 1.1" (27.4mm)
• Distance From Crankcase Center to Front Bearing: 2.2" (56.4mm)
• Distance From Crankcase Center to complete of Crankshaft: 3.5" (88.7mm)
• Width at Mounting Tabs: 2.4" (61mm)
• Width of Crankcase Below Mounting Tabs: 1.7" (42.6mm)
• Distance from Throttle Lever to Center of Crankcase: 1.7" (42.5mm)
• Distance/Bottom of Mounting Tab/Top of Cylinder Head: 3.2" (81.2mm)