Features
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- The Spec II boasts excellent mileage and an improved bottom end.
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- Holes machined into the aluminum outer head decrease overall weight to the bare minimum, and aid in cooling as well.
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- The crankcase and liner port have been designed to increase torque at low- to mid-speeds.
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A proven powerhouse – redesigned!
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A proven powerhouse has been redesigned with the O.S. 12XZ Speed Tuned Spec II, forever raising the bar for 1/10 scale racing engines. The enhancements – including holes machined into the aluminum outer head for reduced weight and tungsten weights for better balance – may seem subtle, but they make all the difference when it comes to taking the checkered flag.
- A special coating on the crankshaft reduces friction and wear.
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- Tungsten weights offer better balance at high rpms.
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Specifications |
Displacement: 0.211 cu in (3.46 cc)
Bore: 0.543 in (13.8 mm)
Stroke: 0.55 in (14.0 mm)
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Practical rpm range: 5,000-44,000
Output: 1.75 hp @ 35,000 rpm
Weight (w/o muffler): 8.1 oz (230 g)
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