Personally, looking at your photos....
The first pic of the losi motor looks fine, and the pinion looks to be a 48dp pitch (tooth size etc.)....
..the second pic, the pinion on your novak looks to be a more coarse pitch possibly a tamiya style .4 pitch. Which would explain why it has done it and why it seems to have actually removed every other tooth rather than just stripping/melting like we do at races.
Get a new 'spur' ( the large gear) and get a new pinion (the small one) and make sure they give a 48dp pinion (around a 23tooth). then all should be fine.
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