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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!

The OS Max-21XM Ver.II Marine Engine is a high-performance air-cooled outboard marine engine for small and medium-size radio controlled outboard boats. It is of sturdy construction and designed for easy maintenance. It is not necessary to re-adjust the linkage when the installation angle to the hull is changed. A tilt mount is supplied as standard. Also, a carbon-fibre propeller is included.

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 aluminium 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

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$720.90
AUD $720.90
    • Stock Number: OSMG1720
    • Displacement: 0.211 cu in (3.46 cc)
    • Bore: 0.654 in (16.6 mm)
    • Stroke: 0.630 in (16.0 mm)
    • Practical rpm: 3,000-25,000
    • Output: 1.28 hp @ 25,000 rpm
    • Weight: 24.1 oz (682 g)
    • Prop Shaft Diameter: 3/16 in

     

    NOTE: Do not use car or truck fuels; use fuels designed for boat use

  • Includes:

    • Mount, outdrive unit
    • E-2050-2 removable muffler
    • Starter cone
    • #20J carb
    • #8 glow plug
    • Steering bracket
    • Throttle link assembly & 42 x 1.2 carbon prop

    Requires:

    • 10-50% nitro boat fuel with at least 18% oil content
    • Starting equipment
    • Fuel tubing

     

  • Domestic Shipping starts at $50.00 for this item plus $45.00 for each additional item . International Shipping starts at $90.00 for this item plus $55.00 for each additional item. Shipping availability to your country and Total Shipping will be finalized at check out.