I just got this ultra mbx and replaced alot of parts on it, and first time out (about 5 min) the throttle servo must of been broke and it screamed full thottle and hit my yards fence about 30 feet away. It felt like it ran perfect, when I got to it I shut it down by caping off exaust, I fixed the servo that nite, and when out to try it again the motor turned over hard in one spot (TDC). My question is, What motors can I put in that are readly availible, I have so much into this now, I hate to think I'll have to spend hundreds more. I see alot of t-maxx motors on here and ebay, would one of them mount in place and if it does mount, does anything else match.Thanks...Dave

This is the motor I run, I love the damn thing. It's bullet proof, and adds about 5mph to the topspeed of your buggy compared to stock. It starts way easier than the stock motor too (one time I let the thing sit (without after-run in it, i forgot) for 2 years, it started the first try). After 4 years total of having nothing but nitro in it, the bearings aren't even rusted, it's in perfect condition. http://www2.towerhobbies.com/cgi-bin...?&I=LXBZ33&P=0


Odds are your buggy went wild because of that ****ty battery holder that came with the buggy. I have had that happen to me 4 times now. 2 cars, and 2 fences have stopped my buggy at full speed. It never occured to me that a crappy plastic battery holder bouncing around inside a metal car could have a crack in the wiring and have continuity at slower speeds, then after some jarring at high speed lose that continuity. 4 years later I have dragged my buggy back out and am in the process of soldering up solid nicd battery packs. I suggest you do the same.

Hi guys, on the subject of battery holders i think i have finally fine tuned mine to give no problems. Firstly i made an aluminium box to hold it securley in place instead of the poxy tie wrap (TTR EB4). also found that on hard impacts the batteries could slide away from + contact and not spring back so i have wedged a small piece of fuel pipe between the battery holder springs to increase the tension, sorted. Most important thing though is a fail safe and i also fit a exhaust header spring to the throttle arm so even if you loose all electrics it still shuts the throttle, this flattens the batteries a bit quicker and slightly slows throttle response but i don't race and i have had one too many out of control full throttle moments so i reckon its worth the small sacrifices. Just my 2 bobs worth. Hope they help