O.S. Speed 21VZ-B V-Spec AL

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O.S.® Speed 21VZ-B V-Spec AL

Features

Hardened, chrome-plated 4-port cylinder and liner for high durability and long life

Specially coated crankshaft with precision ceramic bearing that greatly reduces friction, plus a Tungsten weight for added balance

Machined steel piston features parallel rings that trap fuel oils and use them as a seal to enhance compression and boost power

Reshaped crankcase core ensures smoother air flow and more consistent performance

Slide valve carb with 8mm and 9mm carb restrictors allow tuning to specific track conditions; low-end needle adjusts from side to side for maximum adjustment ease

V-shaped aluminum head provides fast heat dissipation

Tower Hobbies $15.00 Gift Certificate when you purchase an O.S. Speed 21VZ-B V-Spec AL from this page.
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The latest O.S. Speed-tuned V-Spec engine combines factory-tuning and an aluminum heatsink head for exceptional cooling and performance! A specially coated crankshaft with a ceramic bearing reduces friction, while a tungsten weight provides extra balance. Best of all, the 21H 3-needle carb lets racers fine-tune their vehicles on the toughest tracks!

Specifications

Displacement: 0.21 cu in
Bore: 0.65 in
Stroke: 0.63 in
Practical rpm Range: 3,000 – 40,000

Output: 2.5hp @ 34,000 rpm
Weight: 12 oz
Requires: T-2060SC WN tuned silencer, #203 air cleaner assembly, and Fuel