Key Features
- High performance crankshaft has silicone filled intake passage and Tungsten counterweights
- Lightening holes in cylinder head reduce overall weight
- 22B2 single needle slide valve carburetor
- ABC piston and liner construction “A”luminum piston fitted to a “B”rass cylinder liner that is “C”hrome plated
- Optimized power band

OS Engines Carburetor: #11K Slide, 18TZ, 21TM for Parts
OS Engines 21TM ABC .21 Engine with Manifold: 2.5 and 3.3 Revo for Engines 








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