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- Rotary type, big bore (10 mm) 21D carburetor
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- Water-cooled plug cap and 2K flywheel
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- ABC cylinder construction
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- Plug-mounted water intake
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- Competition-ready liner porting and inner head
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Buy a new O.S. Engine between August 3rd and December, 31st 2009 and exchange the engine you're replacing for a valuable O.S. Engines merchandise certificate.
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The 21VZ-M boasts a liner porting and inner head designed specifically for high nitro boat competition. Other high-performance features include a water-cooled plug cap and 2K flywheel. With the intake mounted directly on the plug, cooling water is channeled to the center of the head — the engine’s hottest point — before exiting. Finally, a big bore (10 mm) on the included carb boosts power to the max!
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Specifications
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Displacement: 0.2 cu in (3.46 cc)
Bore: 0.65" (16.6 mm)
Stroke: 0.63" (16 mm)
Practical rpm range: 3000-40,000
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Power output: 2.5 hp @ 33,000 RPM
Weight: 12 oz (340 g)
Requires: Glow fuel
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