Product Name: Kit De Motor De Bicicleta/Bike/Bike Motor Kit/Bicycle Motor Kit/Woodpecker 4 Stroke 31cc 5g Lock & Load Friction Drive Bicycle Engine Kit Application: Road Bike, Mountain Bike, Ordinary Bicycle Certification: ISO9001 Condition: New Product Description The WoodPecker 31cc 5G Lock & Load Friction Drive bike engine kit just made motorizing your bike a lot easier. Unlike other bicycle engines that mount in the center of your frame, friction drive motors mount directly over your wheel, which gives you a wider range of bicycles you can use with this motor.It mounts over your bike's wheel you don't even need to install a rear drive sprocket: the friction from the mount's drive shaft will pull your wheel using friction to rub against the tire and propel.Of course, you still receive everything you've come to expect from WoodPecker: quality parts and excellent service. So if you're looking to motorize your bike without all the hassle other bikes will give you, get ready to rock with the 31cc Lock & Load Friction Drive 4-Stroke Bicycle Engine KitEngine Specifications: 1,Engine Model: 139FA, Single cylinder,Air-cooled,4 stroke 2.Bore*Stroke: 39*26mm 3.Displacement(cc):31cc 4.Max.Powe(kw/rpm):0.7kw/6500 5.Start mode:Hand-operated 6.Fule Tank Capacity: 0.9LPackage Includes:5G Lock & Load Friction Drive 4-Stroke Engine 31ccGas Tank (may require a longer fuel line)Friction Drive Mounting PlateBicycle Mounting Kit w/ HardwareThrottle Grip HandlesKill switchThrottle Cable