me being me and being a fan of power. I'd stick in a Ninco NC-4 Stinger. It kicks out 31,000rpm and comes with a bracket so it'll fit staight into you NC -2 sized hole.
Thats only ok if that kind of power would suit your track, if you have a more twisty circuit follow lotus03's advice.
Ive been running a stinger in my fly saleen, goes like stink but the brakes are terrible! The best thing ive got for speed and control is a NC5 speeder. But i havnt tried an NC6 yet (only cause they didnt have any in stock!)
On second thoughts, maybe the Stinger isn't for the general user. I've only used mine once in competition, that'd be at Slot-Tech Raceway. With it's long straights and cambered curves. Even here, i geared it down in a effort to boost brakes.
NC 5 is a nice motor to have.
slot.its boxers are exactly the same size as a nc2 and they have a very good balance of rpms and torque.
i find the nc5 very good and controlable on our flour/rally track and the nc6 too "speedy" for our 4mts straight. on a non-floured track like my home track, the nc6 rules.
i use the boxers as a nc2 replacement quite frequently on our speed track, both on f1´s and dtm´s (eurocars). at 15v these guys dig out 31k rpm with better much brakes than the nc4 without gearing up.
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