New!

Aftermarket replacement for all OS based XZ-B engines

MSRP $229.99

Contains: One Piston, 1 cylinder sleeve, 1 connecting rod, 1 piston pin, 2 pin clips - fully assembled and ready to drop in.

This auction is for an aftermarket Long Stroke Piston/Sleeve/Rod for O.S. 21XZ-B V2 Vspec II engines and also fits all speed/OS Max 21XZ-B. This is the exact same size and bore as the 21XZB Speed and JX-21 BO2. The connecting rod has an oiling hole so it will work with any OS crankshaft. It replaces OS part #22423110 The ABC piston/sleeve has a special coating for improved performance and durability due to lower friction. This combo will replace the stock OS  piston and sleeve for half the price. Hand picked piston & sleeve for a perfect match. Recommended break in is 1 gallon at operating temperature with very little load at a rich setting. Do not put a race tune on until the mechanical pinch is gone. Due to the nature of nitro R/C racing engines, there is no warranty on this item. Please follow engine instructions for installation and tuning settings.

*Again, this item is not made by OS Engines.