OS Engines MAX-120AX Ring (70d) W/O Silencer

Overview

O.S. Max Two-Stroke 1.20AX ringed engine without a muffler.

Features

• Ideal for 3D, precision and sport flying.
• Mounts in same space as the .91FX (actual mounting dimensions vary slightly, see SPECS)
• Steel piston ring and liner, aluminium piston
• Carburetor: 70D with rearward angled needle valve for safety.
• Glowplug: O.S. #8 supplied with engine, A5 can also be used.

What you need

• Fuel: Two stroke with 20% lubricant and 5-20% nitromethane
• Muffler: E-5020 Power Box
• Propeller: 15x10-12 or 16x8-10
• Field Equipment: Glow starter, fuel filter, fuel pump, fuel tubing

Specs

Displacement 1.218 cu in (19.96cc)

Bore 1.197" (30.4mm)

Stroke 1.083" (27.5mm)

Crankshaft thread size 5/16-24

Practical RPM 1,800 - 9,500 RPM

Power Output 3.1ps/9000 RPM

Weight 22.82oz (647g) without muffler

Weight 7.074oz (219.2g) with 90? adapter installed

Weight 7.907oz (245g) with extension installed

Distance Between Mounting Holes Same Side 0.98" (25mm)

Distance Between Mounting Holes Opposite Side 2.3" (58mm)

Distance Center of Crankcase to End of Crankshaft 4.3" (109.5mm)

Distance Center of Crankcase to Drive Hub 2.7" (69.8mm)

Width Between Mounting Tabs 2.6" (67mm)

Width of Crankcase Below Mounting Tabs 1.8" (46.5)

Length from Backplate to End of Crankshaft 5.5" (139.9mm)

Length from Backplate to Drive Hub 3.9" (100.2mm)

Height/Bottom of Crankcase to Top of Cylinder Head 4.3" (109.2mm)

Height/Bottom of Mounting Tabs/Top of Cylinder Head 3.4" (85.7mm)