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Cylinder capacity can be increased with a larger cylinder, but also with a longer crankshaft stroke!
For example, if you now have a 51mm cylinder on your standard crankshaft, it is now 85cc.
With this crankshaft it becomes 106cc.
You don't need another higher cylinder!
Suitable for the NT 12 volt engines, such as Skyteam, Zhenhua, Lifan, Sachs Madass.