tz is way too power ful look at a os cvrx think www.jespares.com does them. i personally got a lrpz16s engine for £60 from some closing down sale last year and it whips even my race buggys and the engine has seen almost 7 gallons still runing no prob never a prob tuning never broke pullstart and i have not broke my mt2 since i got the engine and im stillrunnign ym stock rtr diffs whihc have seen over 15 gallons use in the last 2 years. i think the newer verison of the engine i got is the lrpz18s should be unreal also.