Developing on the on the Speed 21XZ-B the Spec II improves on O.S.'s rich history of 1/8th Off Road World Championship winning engines. Racing engines are a constant refinement of design and technology rather than a huge leap. The Speed 21XZ-B is case in point. No one area has been dramatically changed but nearly every area has been subtly developed to make the Speed 21XZ-B Spec II a step forward in performance.
• New lighter crankshaft with DLC coating
• Modified lighter piston and conrod
• Re-designed head with increased cooling
• 21J carburetor
• 6mm and 7 mm carb restrictors
Weight
|
362g (12.77 oz.)
|
Capacity
|
0.213 cu.in. (3.49 cc)
|
Bore
|
16.27mm (0.641")
|
Stroke
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16.8mm (0.661")
|
Power Output
|
2.61 hp (2.56 ps) @ 34,000 rpm
|
Practical RPM
|
4,000 - 42,000
|
- Brand: OS Engines
- Part No: L-OS12183
- Barcode: 4531028154506
- Displacement: 3.5cc (0.21ci)
- Starter: Flywheel Start
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