some advice
I have the 40 series from comet on my kids go kart (i believe its a 7" driven). Jackshaft sprocket is a 9t, axle sprocket is a 54t, chain size is 420, tire size is 22x11-8.
Go kart climbs super steep hills and can do doughnuts in the dirt even with a live axle. Actual top speed is 40 mph. Put a Honda gx390 13 hp engine on it. Its a blast to drive.
Comet is the best brand... IMO, but I have a GTC /billet aluminum (for the smaller engines) on a mini bike and it seems to perform well.
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