I said it once before, my fastest car is my stock Murci with gear diff well broken in. If there was a national or world level event that I had to race tomorrow, I would throw this car down without thinking twice.
We have like 7 Kyosho ball diffs between the two of us and we have found they are all very different out of the box. These ball diffs require solid cleaning and consistent LIGHT lube and regular maintenance to be really good and predictable.
As for tension setting, the diffs have 2 spacers and one c-clip keeper stock. This is way too much tension. One spacer and the keeper is plenty for the torque put out but the little stock motor. I woud even say it is enough for the xspeed too but we decided the xspeed was a bit ridiculous speed for our track and shelved them.
The comment about fuzz in one of the front wheels should always be the first thing you check if your car is tweaked on power.
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