O.S. Speed 21XZ-B Spec III

O.S. Speed 21XZ-B Spec III

Brand: OS Engines

Part Number: L-OS1AN00

£409.19 Web Price RRP £439.99

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The 21XZ-B Spec III is that latest evolution of the popular 21XZ-B racing engine from OS. OS are known worldwide for developing race winning 1/8th Off Road World Championship engines and this latest iteration is a result of constant refinement. Using the latest OS design techniques and technology lots of small improvements have added up to a noticeable step forward in performance. These improvements not only enhance the outright performance but also the drivability and usability in high pressure race situations.

• The Spec III has a long stroke for optimum torque
• Improved low-to middle-range torque for corner exits
• 3 scavenger ports and 3 exhaust port cylinder
• Reduced weigh head for a lower CG
• DLC-coated crankshaft with pressed-in tungsten weights
• 21J carburettor with 6.5 mm restrictor

Note:This engine does not include a tuned pipe or manifold.
Glow Plug Turbo P-3 Glowplug (Included)
Weight 353g (12.45 oz)
Capacity 0.213 cu.in. (3.49cc)
Bore 16.27mm (0.641")
Stroke 16.80mm (0.661")
Power Output 2.61 hp (2.65 ps) @ 34,000rpm
Practical RPM 4,000 - 42,000
  • Brand: OS Engines
  • Part No: L-OS1AN00
  • Barcode: 4531028023635
  • Displacement: 3.5cc (0.21ci)
  • Starter: Flywheel Start

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