35 Series Symmetrical Hub Sprockets - AndyMark, Inc
40 Chain Sprocket with 14mm Bore and 9 Teeth - TRM4148_0 - Phidgets
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Amazon.com: AlveyTech #35 Chain 40 Tooth 1-1/2" Bore Steel Sprocket - Replacement Parts for the Monster Moto, Mega Moto MM-K80R, TaoTao GK80 Gas Go-Kart, Mini Bike, Dirt Bikes, Pit Go-Karts, Pitch Type