I think the RTR spur is the same as of the 210 kits. Anyway, it shouldn't happen. My guess is one of the following things happened:
- The spur gear stripped because the slipper was too tight out of the box (happened to me on a RTR Kyosho once: the slipper was completely tightened and the gear stripped after a few small jumps).
- The spur gear melted because the slipper was too loose (and the slipper system became too hot).
- The spur gear stripped because of a bad(ish) mesh (out of the box...?)
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