O.S. 21XM VII Outboard Marine

Tower Stock# LXBBLY  •  Manufacturer Stock# 13941
O.S. 21XM VII Outboard Marine (large view)
Quantity Discounts Available
L5BBLY02
Save $36.00
2 for $763.98
Notes from our tech department:
This is the O.S. 21XM Version II Air Cooled Outboard Marine Engine.

****** Because of the competition nature of this engine,******
******it is NOT covered by the O.S. 2 Year Warranty.******

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

REQUIREMENTS

Glow Fuel: 10-30% nitromethane content, use 20% for break-in
Glow plug igniter and shore equipment

SPECIFICATIONS

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)
Carburetor Settings:
Needle Valve; 2.5 turns from fully closed
Mixture Control Valve: Shoulder portion exactly at a tangent to
the throttle rotor hole
Distance between mounting hole centers same side: 0.98" (25mm)
Distance between mounting hole centers opposite side: 1.5" (37.5mm)
Distance/outer mounting hole centers on steering arm: 2.5" (64mm)
Width of muffler: 1.8" (46mm)
Distance from flywheel to skeg: 8.6" (219mm)
Distance from mounting plate bottom to skeg: 3.4" (86mm)
Distance from mounting plate top to flywheel: 3.5" (87mm)
Distance from mounting plate to end of cavitation plate: 7.2" (183mm)
Distance from mounting plate to prop attachment point: 5.9" (149.5mm)
Distance from bottom of mount to driveshaft center: 1.3" (34.5mm)
Height of mounting plate: 1.8" (46mm)

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.

jxs 05/25/11
ir/jxs

Resources
See Tower Catalog page 174.
Easy RC: Engines
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