Description:

The next generation in .21 outboard marine performance!
Leave it to the engineers at O.S. to concoct a sure-fire recipe for marine racing success! First, they started with the 21XM, O.S.' exceptional outboard engine and winner of 11 championships in a 4-year span. They then upgraded the cylinder head and muffler. The result: the 21XM VII, an air-cooled powerhouse that's even faster than the original!

Features:
The machined head is air-cooled, which insures optimum engine temperature under any conditions
The muffler has been extended to generate more torque and power
With perfectly matched port timing, exhaust outlets, compression ratio and carb bore, the 21XM VII is designed for competition, right out of the box
The 20J carburetor has both high-speed and idle needles
A pressure line from the muffler sends a steady flow of lubricants to the lower unit
Prop height and angle can be adjusted independently
Ball bearings minimize friction and wear for longer life and higher top-end speeds
The bronze prop shaft assembly offers extreme durability
A lightweight aluminum piston is performance-matched to a long-lasting ABN cylinder sleeve
An exceptional value as well as a total competitive package, complete with a #8 glow plug and 42 x 1.2 carbon prop

Specifications:
Displacement:3.46cc
Bore:16.6mm
Stroke:16.0mm
Practical rpm:3,000-25,000
Output:1.28hp/25,000rpm
Weight:682g

Included:
Mount
Outdrive unit
E-2050-2 removable Muffler
Starter cone
20J Carburetor
#8 Glow Plug
Steering bracket
Throttle link assembly
42x1.2 carbon prop

Requires:
10-50% nitro boat fuel with at least 18% oil content, starting equipment, fuel tubing
!Do not use car or truck fuels; use fuels designed for boat use!