O.S. Engine 12XZ Speed Spec III

O.S. Engine 12XZ Speed Spec III

This new engine is packed with features like a new cylinder liner and piston for more torque and fuel mileage, plus a redesigned head button for better performance and improved acceleration. Check out all the details in the press release below:

O.S. engineers have taken superior Speed Spec performance to the next level! In addition to smoother acceleration from idle to full throttle, the 12XZ Speed Spec III also has increased low-to mid-range torque. Drivers will still enjoy the same impressive top end speeds that 12XZ Speed Spec engines are known for — with the bonus of improved fuel mileage. In fact, acclaimed on-road champion racer Takaaki Shimo utilized all of the 12XZ Speed Spec III’s advantages to claim victory in the 2012 Japan Nats!


  • Redesigned head button for better performance and improved acceleration
  • New cylinder liner and piston improve mid speed torque and fuel mileage
  • The slide valve’s shape allows for a smoother flow of fuel and air


Displacement: 0.128 cu in (2.1 cc)
Bore: 0.543 in (13.8 mm)
Stroke: 0.55 in (14.0 mm)
Practical RPM range: 5,000-44,000
Output: 1.73 hp @ 35,000 rpm
Weight: 7.9 oz (225 g)
Includes: 12F2(B) carburetor, RP6 glow plug, exhaust seal ring, dust cap set, 5.5 mm red carb reducer

OSMG1992 – 12XZ Speed Spec III Engine – $699.99
OSMG2973 – T-170SC L52 Tuned Pipe Set – $199.99

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If you like this article, check out this additional article on O.S. Engine.

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Updated: January 2, 2013 — 2:46 PM
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