>That's aircooled bug motor in Brazilian "monster bike".

Not only the engine, it used the beetle transmission!

I read a review of this bike when it was new.  It was designed because Brazil banned imports of motorcycles to support the domestic industry, but they had no domestic motorcycle makers!  Someone contracted with VW to provide engines and transaxles and built a motorcycle with them!  As I recall the performance was terrible until the magazine doing the review took it to a vw performance shop and had some serious tuning done.

Bill