O.S. 21XM VII Outboard Air Cooled...
O.S. 21XM VII Outboard Air Cooled Marine Engine
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This is the Air Cooled O.S. 21XM Outboard Marine Engine.
FEATURES: Designed expressly for small and medium size outboard boats Installed aluminum tilt transom mounting plate Preassembled outboard unit with flexible propeller Blue anodized aluminum heat sink head 42mm carbon fiber propeller 20J carburetor
INCLUDES: O.S. 21XM Version II Outboard Marine Engine, Muffler, Mounting Plate, #8 Glow Plug, Propeller, Outboard Unit, Steering Arm and Instructions
REQUIRES: Glow Fuel: 10-30% nitromethane content, use 20% for break-in Glow plug igniter, starting belt and shore equipment
Displacement: .21 cu in (3.5cc)
Bore: 0.654" (16.6mm)
Stroke: 0.630" (16mm)
Practical RPM: 3,000 - 25,000
Power Output: 1.3 PS, 1.28
HP @ 25,000RPM
Weight: 24oz (682g)
Needle Valve: 2.5 turns from fully closed
Mixture Control Valve: Shoulder portion exactly at a tangent to the throttle rotor hole
COMMENTS: This Engine STARTS AND RUNS IN A CLOCKWISE DIRECTION at the starter cone.
Any attempt to start engine in a counter-clockwise rotation may cause serious damage to the engine.
Because of the clockwise rotation, the crankshaft has reverse threads.