BBR Tuning 49cc 5G Pull Start Bicycle Engine Kit &ndash; 4 Stroke Gas Powered Bike Motor Engine Kit CENTRIFUGAL AUTOMATIC CLUCH: The all new BBR Tuning 5G 4 Stroke bike engine kit features a centrifugal clutch and pull start which makes this engine easy to start and ride, there is no need to engage and disengage the engine manually. Similar to an engine for a scooter or goped, you simply pull the starter chord and hit the throttle to go! No extra room on your handlebars needed for a clutch lever and no clutch adjustments necessary. NO MORE MIXING GAS AND OIL: Forget premixing oil and fuel! Instead, this engine features an independent oil reservoir which keeps the engine well lubricated. This is the reason the 4 stroke engines are known for their reliability and long life. HIGH PERFORMANCE: Pushing 2-3HP (horse power) this engine kit can reach speeds from 20-25mph (miles per hour) and gets an amazing 100-150 miles per gallon. All of the BBR Tuning bike engines feature the latest upgrades, including Japanese crank bearings and clutch components. We make certain that all of our manufactures abide by strict quality control assurance measures and use the highest quality material so that we can make certain that all of our customers get only the best. EASY INSTALLATION: This kit makes installation a breeze, it includes the necessary components to install on most 26" wheel bikes (Mountain, Cruiser, Chopper, Road) with V styled frames. The frame should have 9-11" of clearance between the bottom bracket and top bar, and the diameter of the frame tubes should be 25-29mm (around an 1"). The rider only needs some basic hardware skills, tools, and around 2-3 hours for installation and fine tuning adjustments INDUSTRY LEADING 6 MONTH WARRANTY: Backed by an industry leading 6 month manufacture warranty and lifetime support the BBR Tuning 49cc 5G Engine Kit comes with the industries best support and a satisfaction guarantee