The little Honda Monkey bikes, the 50cc Z series mini bikes, are pretty popular in some countries. Some fans of the little guy really engineer very nifty modifications, like this 125cc inline 4 cylinder engine for instance. It’s so small it looks like a model but it’s a real engine and sounds great!

Not a lot of detail on their website but very, very cool.

Thanks for the tip, Aaron!

More photos and video below:

Link: Wirthwein Motoren

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