Zeda Screaming Demon V2 Engine-Ready Motorized Bicycle - Built In Gas Tank - Gas Frame Bike - Bicycle-Engines.com
Gas Motorized Bikes - YouTube
Gas and Electric Combo Motorized Bicycle - PedalChopper
Amazon.com : Bicycle Engine Kits 100cc 2-Stroke Gas Motor Bike Bicycle Motorized Full Set Super Fuel-efficient for Most 26"" /28"" Scooter : Sports & Outdoors
Amazon.com : LIKARVA 100cc Bicycle Motor Kit Bike Motorized 2 Stroke Petrol Gas Engine Full Set 44 Tooth Sprocket Motorized Full Set Upgraded Bicycle Motor Kit for 26 inch/28 inch Bikes : Sports & Outdoors
Difficult to determine which rules apply to motorized bikes