I got my SX at the start of July. replaced the idle gears when I got it since they looked a bit mashed and the trans wasn't smooth enough for my liking. Then munched those and replaced them 3 weeks later. Then munched those a week after that. At the start of August I replaced the gears again and replaced the bearings the layshaft sits on and never had a problem since.
Since then I've done a regional event, EOS finals, MAM kiddy race and a handful of club nights on polished floor and carpet.
Schumacher have updated these gears and redesigned the slipper adjustment.
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