help me sort this out

you guys are awesome. I cant wait to try. my son is only 28 months. maybe he will grow into it more

If it were just for him, he would be better off playing with the wooden trains/tracks. He will learn to love them.

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also, whats the significance of running the motor w batter before installing? just to see if it fries the engine?

I've not known a battery fry a motor before, these motors are generally designed for 3v's anyway but I'm sure the insulation can withstand way more than that. You don't have to run the motors dry, but it can help improve the performance and longevity of the high performance motors, personally I never bother! The idea is that you run them before installing them so that the motors get a chance to bed in, it gives the motor commutator chance to get a patina and gives motor brushes chance to form a mating surface which gives a better contact whilst the motor is running (meaning it runs better at faster speeds) I don't bother as I always assume the motors will bed in as we use them, and as I'm not into racing the performance difference between a bedded in motor and an un bedded in motor is minimal, and longevity wise? Well I've not had an uprated motor fail yet, but if one does I'll just replace the motor!

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Second question is about swapping out the engine/motor. I'm all for a little easier even if the motor costs alittle more. It sounds like I can just buy a motor and swap them out (w the help of a soldering iron). Is that accurate? any brands/ types recommended? i saw this lot on ebay, would these work?

Thanks,
Kevin

I don't know the brands but I think ucwepn has used a Doyusha motor before, these motors are pretty universal and seem to be used in lots of things, I'm sure they would fit but don't know how they would perform? Probably awesomely quick if the numbers are referring to the rpm! 50,000! - I don't know how long your batteries would last though!

And yes, if you have a screwdriver and soldering iron and a little bit of solder the motor will be simple to change!