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Amazon.com : TFCFL 100CC 2-Stroke 36 Tooth Bicycle Engine Kit, Gas Motorized Bike Motor Set, Bike Modified Full Set Petrol Gas Motor Engine Kit for Most 26" /28" Bikes 48km/h (36 Tooth) :
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Amazon.com : AW Electric Bicycle Motor Kit 48V 1000W 26"x1.75" Front Wheel Powerful Motor E-Bike Conversion Kit w/LCD Display : Sports & Outdoors
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Amazon.com : JauoPay 48V 1000W Electric Bicycle Conversion Kit 26" E-Bike Front Hub Motor Wheel 28mile/h (45km/h) High Speed Brushless Gearless Hub Motor Kit : Sports & Outdoors
