Off road ZX21 DSII engine by Mega. This 3.5cc Race engine has improved internals from the original ZX21 Off road motor making it perform better and more reliable.
Perfect for your off road nitro buggy this new Mega ZX21 DSII has been released with some very effective upgrades. Featuring revised internals, the crankpin has been incorporated into the single piece crankshaft and then further hardened using a special treatment. The fuel flow through the crankshaft has also been improved to enhance overall engine performance.
The conrod has also been strengthened with more material now surrounding both bushings for better durability. The piston has also had some changes made to it to make it lighter along with the piston pin that has also been lightened. As a final improvement the cooling head has been redesigned to be taller, with more fins (11) to improve airflow and cooling.
Additional Information
Comes complete with engine instructions and Mega decal sheets