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A 2-stroke bicycle engine kit is a type of small internal combustion engine kit that uses two different piston strokes to complete one operating cycle. 2-stroke bicycle engine kits perform all the same steps but in just two piston strokes. The simplest 80cc 2-stroke bicycle engine kits do this by using the crankcase and the underside of the moving piston as a fresh charge pump. Such engines carry the official name "crankcase-scavenged two-strokes. However, fast 2-stroke bicycle engine kits are not lubricated by a reservoir in the crankcase; they rely on oil mixed with the gasoline to lubricate the engine components.
All five tasks of a cycle are fulfilled in only two strokes of the piston in an ignition 2-stroke bicycle engine kit (or one revolution of the crankshaft). A tiny amount of oil is put into the fuel for 48cc 2-stroke bicycle engine kits. Since 125cc 2-stroke bicycle engine kits are lubricated by oil in the gasoline and lack a crankcase, they are more suited to operation at various angles. The power-to-weight ratio of 100cc 2-stroke bicycle engine kits is greater than that of most 4-stroke engines, making the 2-stroke engines predominant in hand-carried applications such as blowers and string trimmers. The lack of a crankcase and the fact that 125cc 2-stroke bicycle engine kits are lubricated by oil in the gasoline make them more conducive to operation at various angles.
50cc 2-stroke bicycle engine kits are smaller and lighter than four-stroke engine kits, thus they are more efficient as they produce power just once every turn (instead of once during every two rotations, as in a four-stroke engine). This means they require more cooling and lubrication and experience greater wear and tear. 2-stroke bicycle engine kit parts and functions are appropriate for smaller-scale applications due to their compactness and power-to-weight ratio. They are commonly seen on RC toys, dirt bikes, chainsaws, small watercraft, and landscaping tools. Because an ignition 2-stroke bicycle engine kit has fewer parts, a simpler design, and no oil sump, these engines are more reliable in cold weather. Due to this characteristic, they are also suitable for use in snowblowers and snowmobiles.