The motors do get pretty warm in the stock RC 18T's . They even have a sticker from the factory that says be careful. As far as the gearing goes if it had a yellow pinion on it is not factory. If you are lookingfor serious speed you can go with the mamba 6800 but if you want speed tempered with torque i'd go with the 5400 . I do infact have both ... the 6800 is insane fast in my Mini-t almost uncontrollable....
If you want a Mamba Package I can easily purchase one and then just send it to you .... If this is something that interests you send me an email to
tornacl@cox.net and we can get things rolling. I would suggest getting the Mamba USB link at the same time if you do get a mamba ....