O.S. Speed Tuned 12XZ (P) Spec II

O.S. Speed Tuned 12XZ (P) Spec II

By redesigning this proven powerhouse, O.S. is raising the bar for 1/10 scale racing engines the Speed Tuned 12XZ (P) Spec II. The enhancements may appear to be subtle, but they can make all the difference when it comes to taking the checkered flag.

  • The Spec II boasts excellent mileage and an improved bottom end
  • Holes machined into the aluminum outer head decrease overall weight to the bare minimum, and aid in cooling as well
  • The crankcase and liner port have been designed to increase torque at low- to mid-speeds
  • A special coating on the crankshaft reduces friction and wear
  • Tungsten weights offer better balance at high rpm
  • A newly designed cylinder head is 6mm shorter than previous heads for lower center of gravity

Stock Number: OSMG1991
Displacement: 0.128 cu in (2.1 cc)
Bore: 0.543 in (13.8 mm)
Stroke: 0.55 in (14.0 mm)
Practical rpm: 5,000-44,000
Output: 1.73 hp @ 35,000 rpm
Weight: 7.8 oz (220 g)
Includes: 12F(B) carburetor, RP6 glow plug, exhaust seal ring, dust cap set and a 5.5mm red carb reducer

Holes machined into the aluminum outer head decrease overall weight to the bare minimum, and aid in cooling as well.

The crankcase and liner port have been designed to increase torque at low- to mid-speeds.

T-1060 L52 tuned silencer is fixed to the manifold with a pair pf aluminum clamps, which prevent the silencer from accidental disconnection during races. The new connecting system makes the fine adjustment of the talipipe direction possible.

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