i ran a Novarossi N21BF Limited Edition .21 Off Road 3 Port Buggy Engine (Standard Plug) that monty from houston engines modded for me. it had all the power i needed to do whatever i wanted. i even ran down my buddies ninja jx21 down the straight with it but most importantly the engine never flamed out on me the whole season!!!

by far the best bang for the dollar engine ever made! can't wait to get the new one