Difficult to determine which rules apply to motorized bikes
My Motorized Bicycle - Instructables
DO-IT-YOURSELF U-MOTO 29" 2-STROKE STINGER (TM) MOTORIZED MOUNTAI | U-MOTO Motorized Bicycles, Gas Bikes and Bicycle Motor Kits
Amazon.com : IMAYCC 80cc Bicycle Engine Kit, Bike Motor Kit with Wired Digital Computer, 2-Stroke Motorized Bicycle Kit Fit for 26-28" Bikes (Black) : Sports & Outdoors
Motorized Bicycle | Dublin
Amazon.com: 80cc Bicycle Engine Kit 2-Stroke Gas Motorized Bike Motor Kit 26" 28" Bicycle Motor Engine Kit Upgrade with Speedometer : Sports & Outdoors
Fat Tracker: Down & Out's motorized BMX | Bike EXIF