How to install SpeedFun Furious tuning ebike speed release kit for Bafang M420 engine

Find out how to install the SpeedFun Furious speed release kit on ebikes with Bafang M420 engine. The tuning kit SpeedFun Furious increases the assistance up to 50 Km / h and shows the data halved on the display.
Click here to buy the SpeedFun Furious kit for Bafang M420 engine:
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