My advice would be to stay with the kit motor. You can buy heatsinks from the states that keep the motor much stronger over a race length. Gear the motor up to 18t pinion for a big track with the smallest spur. I have run up to 20 tooth but that was outside on a pretty big astro track.
The only motor that makes a significant speed difference in my opinion is the carisma motors (same can size but 5800 and 6500kv) that the factory drivers use. These aren't commercially available but seem to have a much better balance of power / durability than the small can (20mm) 1/18 motors. I've tried a smaller can motor and without a cooling fan you'll fry it pretty quickly!
Personally I'd wait for carisma / losi to sell a more powerful version of the 24mm can motor. That's what I'm doing (and stirring things up about the motors occasionally on uk-microrc :-))
Something I've tried and am hoping will make the biggest difference at this weekends national is to try and remove the slop from the suspension. I've always found the car to be inconsistent when landing from jumps and on bumpy sections.
I have used an old tamiya eurocup trick (thanks Ian foxwell- blast from the past!) of putting superglue on the suspension shafts and running them in and out of the wishbones until the glue starts to stiffen. Remove the shaft and let the glue on it and the wishbone set. Do this to all hinge pins and the rear hubs. Reassemble the car when glue dry and use some oil on the shafts to keep movement free.
For me this has left me with a car with free moving suspension but virtually no movement. So far I've only run it at one club night but I found the car to be much more consistent.
Hope that helps :-)
no micro regulars I'm not stirring again with the motor comments.
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