Nah you could go to an 18, maybe a 19 with 82 spur, if it has the sintered rotor.
I ran my bonded on 82/17 at kiddy, and it got as hot as I would have liked. 'They' seem to think you can run 2-3 teeth higher pinion (with sintered), so I would start on an 18 and see how it goes.
M
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