The 21XM represents a first from O.S. - a high performance outboard power plant, with features that the serious boat racer will appreciate. Some of its incredible features include Schnuerle-porting, multiple bearings and a lubrication system for the flex shaft bearings for greater performance and increased longevity.

  • The engine's height and angle are adjustable to further optimize performance
  • Comes with a detachable muffler, for easier installation of tuned pipes
  • Also includes a high performance Type 20J carburetor, water pickup, flexible driveshaft and a high performance ready to race right out of the box

SPECIFICATIONS
Stock Number: OSMG1721
Displacement: 0.211 cu in (3.46 cc)
Bore: 0.654 in (16.6 cc)
Stroke: 0.630 in (16.0 cc)
Practical rpm: 3,000-25,000
Output: 1.3 hp @ 25,000 rpm
Weight: 23.6 oz (670 g)