OS Speed Tuned 12TZ Spec II

Tops in touring car engine technology!

• The magnesium head is 35% lighter than standard head material, and allows for lowering the engine’s CG.
• The front bearing is sealed, and the ceramic rear bearing resists heat and lasts longer than steel. bearings.
• The crankshaft is coated to fight friction and increase durability, and is epoxy-filled for more efficient fuel direction.

SPECIFICATIONS Stock Number: OSMG2031 Displacement: 0.128 cu in (2.1 cc) Bore: 0.543 in (13.8 mm) Stroke: 0.551 in (14.0 mm) Practical rpm: 5000-44,000 Power Output: 1.7 hp @ 35,000 rpm Weight: 7.34 oz (208 g) 11385 12TZ Spec II Parts Listing