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. More power and durability. The brass sleeve is chrome-plated for performance and hardened to withstand the wear that racing action can produce. CAD-refined and CNC-machined ports smooth airflow and boost power. Track-tune in seconds! Increase control on low-traction tracks by inserting the 8 mm (red) or 9 mm (blue) carb restrictor. Takes only a second, but pays off, lap after lap. Hardened, chrome-plated, 4-port, cylinder and liner for high durability and long life 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 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 V-shaped two-piece turbo head design provides fast heat dissipation UPDATED: This is the updated engine with the new 21J carburetor.
