 This is the O.S. Engines 21XZ-R VII Competition On-Road Engine. There's a revolution brewing in 1/8 scale racing. The 21XZ-R VII picks up where the original left off, ready to deliver dominating on-road performance with race winning fuel economy. The included 21M carb is unmatched for smooth, linear acceleration. The aggressive timing puts explosive acceleration and top-end speed at your fingertips, while surprising starting ease lets you unleash its race-winning potential right out of the box.
Features:
- Silicone-filled crankshaft is balanced with tungsten weights for optimum balance and minimum vibration.
- A 1-piece crankcase and 21M slide-valve carb for smoother transitions and higher top-end speeds
- Redesigned 21M carburetor for improved fuel economy
- Cylinder liner with 7 scavenger ports and three exhaust ports for maximum combustion and timing efficiency
Specifications:
Displacement: 0.212 cu in (3.49 cc)
Bore: 0.640 in (16.27mm)
Stroke: 0.661 (16.8mm)
Practical rpm: 4,000-45,000
Output: 2.71 hp @ 33,000
Weight: 12.1 oz (343 g)
Includes:
- RP7 Turbo glow plug
- Exhaust seal ring
- 0.01 & 0.02mm cylinder head gaskets
- 8.5mm carb venturi
- Flywheel collet
- Exhaust, carb and fuel nipple dust caps
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