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This is the O.S. Max .21 VZ-B V-Spec-T (P) Off-Road Competition Buggy Engine. Competitors tend to stick with a winner — and the .21 VZ-B V-Spec-T (P) makes that easy to do! Not to mention this engine won the 2006 IFMAR World Championships! .

The raw power to exploit a split-second opportunity is there, tempered by the ability to fine-tune and finesse throttle control to the needs of different tracks and situations. And to help keep the .21 VZ-B V-Spec-T (P) at the peak of its power, O.S. has given it a billet aluminum piston, hardened ABC sleeve for added wear resistance and a new crankshaft design that's simultaneously slimmer and stronger than any O.S. crankshaft ever made. The .21 VZ-B V-Spec-T (P) — designed for first-place finishes over the long haul — from O.S.

CAD-refined and CNC-machined ports smooth airflow and boost power.More power and durability. The brass sleeve is chrome-plated for performance and hardened to withstand the wear that racing action can produce.



  • Hardened, chrome-plated, 4-port, cylinder and liner for high durability and long life
  • Reshaped crankcase core ensures smoother air flow and more consistent performance
  • V-shaped two-piece turbo head design provides fast heat dissipation
  • Slide Valve Carburetor with 8mm and 9mm Carb restrictors allow tuning to specific track conditions, Low-end Needle adjusts from side to side for maximum adjustment ease
  • Machined steel piston features parallel rings that trap fuel oils and use them as a seal to enhance compression and boost power


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