This petrol gas engine kit is used to upgrade the regular bike to a motorized bike. After converting your bike, you can enjoying riding at a faster speed. It almost runs as fast as a motorcycle or scooter, making your outdoor trip more convenient. This engine kit fits most 26" or 28" bikes with V-frame.Features:A complete engine kit for converting your bikeHeavy duty metal engine body for added durabilityComes with all needed hardware for easy installationFit for most type 26" and 28" bikes, such as mountain bikes, road bikes,cruisers, choppers.Specification:Type50CC80CCVolume of oil consumption1.5L/100km2.5L/100kmSpeed limitation30km/hour38km/hourBore & Stroke40mm X 38mm=48 cm347mm X 40mm=80 cm3Rated power1.15Kw/5000r/min (1.6 horsepower/5000r/min)2.5Kw/5000r/min (3 horsepower/5000r/min)Max. power1.6Kw/6000r/min (3 horsepower/6000r/min)3.5Kw/6000r/min (5-6 horsepower/6000r/rnin)Ignition modeCDIFuel typeNo.90Compression ratio6:01Mixing ratio of fuel and engine oil10:1Driving ratio18:01Type of sparking plugZ4C 14MMCooling modeNatural air coolingType of clutchFriction plate / DryColorBlack/Silver for choosingMode of engineSingle cylinder, air-cooling, 2-strokeLubrication oilOil for 2-stroke petrol engine (or oil for 10W/40.10W/30)Instruction Download:Package included:(if you buy 50cc or 80cc engine kit)1x 2-stroke engine1x Sprocket clamp assembly with hardware1x Exhaust muffler 1x Push button clutch1x Heavy duty chain1x Bearing chain tensioner / idler1x Carburetor1x CD ignition coil1x Kill switch (on throttle)1x Chain guard1x Spark plug1x Black gas tank with mounting brackets1x Exhaust pipe clamp1x Plug removal tool 1x ManualAll the needed mounting brackets, gaskets, and hardwarePackage included:(if you buy 50cc or 80cc engine only)1x 2-stroke engineNote:The kit includes all the parts and instructions necessary to convert your bike.Please also keep in mind that the motor will use a mix of gasoline and oil. The oil is used as a lubricant. Without it, the performance and longevity of the motor will be reduced. Please refer to the manual for further information including gasoline/oil ratios.If you have any questions,please contact us for technical solutions.Shipping1.Ship to paypal address only, PO BOX address is not acceptable. 2.We have warehouses in the USA, UK, DE and AU. For those customers who live in the US, UK, DE, EU and AU, we will send item from the corresponding warehouse.Estimated Delivery 2-4 business days to major locations,4-7 business days to remote areas.3.For those customers who live in other countries,we will send item from our foreign warehouses if available, otherwise from China. Delivery time is 5~8 business days.(Tax maybe required if send from China,and tax is buyers' responsibility according to ebay policy.)Return1.This item comes with three years warranty. 2.If your item is received in a condition other than described, please contact us for an immediate solution. 3.All of our items come with a 30-Day money back guarantee,buyers pay for return cost.Contact1.If you have any question or concern, please do not hesitate to contact our customer support team. 2.E-mails are answered Monday through Saturday. Please allow up to 48 hours for a response to your message 3.Please do contact us first before leaving low ratings or negative/neutral feedback