best advice - get down to your nearest club, and there will be a line of racers eager to diagnose your problem, now they're not skimming motors and balancing their cells!!
I reckon the gearbox needs opening up to get to the bottom of it properly. If you've checked the mesh and nothing else is visibly obvious, it needs a strip down.
20 minute job on a B4. Some will even do it blindfolded!!
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