With the introduction of the O.S. .21XZ-M 3.5cc Inboard Marine Engine and the O.S. .21XM V.II Air-Cooled Outboard Marine Engine, O. S. continues its legacy of marine racing dominance – engineered to take down the competition!
.21XZ-M 3.5cc Inboard Marine Engine
- Based on the race-proven 21XZ-R on-road powerhouse and adapted for marine racing with a water-cooled cylinder head
- Silicone-filled crankshaft for optimized intake; two tungsten weights improve overall balance
- Excellent mid-range torque and power with better fuel economy
- RP7 turbo plug is included
.21 XM VII Air-Cooled Outboard Marine Engine
- Designed to maximize cooling and performance
- Larger muffler designed to boost engine power for greater speeds
- Retains many features of the highly successful .21XM
- #8 glow plug and carbon prop are included
OSMG1621 .21XZ-M 3.5cc Inboard Marine Engine $429.99
OSMG1720 .21XM VII Air-Cooled Outboard Marine Engine $449.99
Both O. S. Marine Engines are available now.