Hi mate,
I've had the same issue with my kit. The problem was from the Layshaft Spacer (TD310243) which was a tad too long and was crushing the bearings (the small one was destroyed after 1 meeting). I ended up sanding it down step by step until I could tighten the motor plate without the gearbox binding AND with a little bit of axial play (1/10th to 2/10th, this will have no adverse effect to the running of the gearbox, but do not take out too much) to take into account eventual expansion when the parts get hot.
Fabs
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