[QUOTE=quixoticboi;8083129]Agree with you 100%. To my understanding the .12 is for ROAR sanctioned events right? I was never clear on this, but the stock 2.5R motor is a .15 making it illegal for racing. Am I wrong?

The 1/10 stadium truck class seems non-existent at the moment. If I could get my car up to spec and performance, my local track said I could race with them truggies. Although I don't know how good I would fair against them.

If this is the case, I would upgrade to one of the mentioned motors and upgrade to a 250cc tank (direct drop-in). Have seen and heard many Rustlers with stock diffs/trannies and had no problems going with a bigger motor. Obviously not a .28 or anything.

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A bigger motor will most likely make you slower on a track. You would probably turn better lap times with a .12cc. It would be basically a Jato with too much power for a 2WD. Interesting for bashing, but not competitive. I doubt that a 250cc tank would fit. The Jato guys have been looking forever for a big tank/150cc tank replacement without success.

A .21 motor will cost about the same as a CRT.5 ARR. Back in the day, had a Jato. CRT.5 was much more fun onroad and off.

Check the Traxxas site for more info.

http://cgi.ebay.com/Ofna-CRT-5-1-12-...93025787384245