This is the 3 port .21 Off-Road Ultimate MXS Ceramic Competition Engine. Like its predecessor M3X, the MXS is made by the prestigious Japanese O.S. Engines brand and it's based on their square stroke Speed B21 Ty Tessmann II edition engine but has some modifications on the crankshaft as well as on the back plate to improve performance. This engine has more power and returns to idle way better.
Pro Twister Mods fine tunes the internal port passages of this stellar engine, administering maximum case packing and efficiency. The MXS also comes pre-broke in using Pro Twister's Pro Ebis machine; allowing you to save time and skip to the final, fun steps of the break in process. A final addition of a Pro Flow backplate to this tuned engine provides for smooth linier output and a mid/top end that goes for days.
*No modifications are made to the MXS engine during this process.