O.S. Max 21XZ-B Off-Road Competition Buggy Engine

Features:

• 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.

Includes:

• One .21 XZ-B  racing engine w/21J carburetor
• One P3 Ultra Hot Turbo plug
• One instruction manual w/OS decal
• One extra head shim/gasket(The other gasket is pre-installed)
• One 8mm carb restrictor
• One 9mm carb restrictor
• One exhaust port seal ring
• Two carb rubber gaskets
• One carb cover
• One exhaust cover