I may as well say it, for the past 2 years we have been using a 16 tooth driver, this means your rear sprockets will be in the region of 60 to 66, and you can subsequently use a pair of 200mm diameter plastic sprocket protector, which is very small, for tracks like rye, buckmore, bayford, red-lodge.....when the rear sprockets is that small the lower edge is above the chassis tube, so it will never touch a kerb, and therefore not unsettle the kart, so you can hammer the kerbs and generally go quicker.
I dont have time for conversations telling me the chain wrapping tighter around a smaller 16 tooth driver saps power, because it doesnt!
the side benefit is also because the rear sprocket with the chain is wrapped around is now MUCH smaller, so you are reducing the inertia/flywheel effect of the axle assembly and it will spin-up quicker.
I needed to machine down my sprocket carrier, as when you run the 61 & 60 tooth sprockets the chain gets very close to the bolts, but I have been running this for 2 years, and its fine and dandy.....the outer edge of the bolt holes on the sprocket carrier is now about only 1mm thick, and its "just" clears the chain when running a 60 tooth
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