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Mr Basic - drive train too stiff for motors to move...

I just picked up a Mr Basic kit from one of those free shipping Chinese stores. It's gone together OK, but the drive train is really stiff and the motors can't move it (even on 6xAA NiMH). Any tips?

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Thanks, OddBot. I took it apart and reassembled it. It's slightly better, but still not working. I took a few photos - would you mind taking a look to see if anything looks wrong?

have you applied any lubricant?

 

A little, yes. There was a small ziplock bag(!) with grease in it. It doesn't feel like it's made a difference - there's some misalignment somewhere. When I reassembled it I checked carefully at each stage to see where the tightness was being introduced, but I'm not really any the wiser as it seems to be a cumulative thing. Starboard's a fair bit better that Port. The gearbox unit spins smoothly; installing the rear axles makes things a bit tighter; coupling the front drive shafts adds a fair bit of tightness, and then the front axles seem to introduce the rest of the problem.

Maybe I should go 2 wheel drive? :o)