21RG-M & 21RG-MX

An affordable marine engine for economy-minded boat modelers.

An ideal engine for sport boat hobbyists.
Comes with a water jacket head that helps keep the engine cooler for longer run times.
A front exhaust with 180-degree exhaust header is included for easy muffler or tuned pipe installation.
Both engines can be belt started; RG-MX also includes a recoil starter.

Note: O.S. does not offer a 2-year warranty on these marine engines due to their high-speed performance characteristics.

SPECIFICATIONS
Stock Numbers:
OSMG1624 21RG-M Marine Engine
OSMG1625 21RG-MX Marine Engine w/Pull Start
Displacement: 0.211 cu in (3.46 cc)
Bore: 0.654 in (16.6 mm)
Stroke: 0.630 in (16 mm)
Practical rpm: 2,500-21,000
Output: 1.7 hp @ 28,000 rpm
Weight: 14.9 oz (423 g)
13630 21RG-M Parts Listing
13631 21RG-MX Parts Listing