Hello from the U.K.
Velocity stack or trumpets?.
Anyway, I,ve two MVVS 1.60 engines and both run well.
However, I do notice a certain amount of unused fuel, or more precisely, the oil part of the gas, seems to "get out" of the carbie and sprays the engine and interior of cowling.
Not to a large degree, but enough to ask, why does this happen?.

Would a "stack" minimise this fuel being blown out, thrown out of the carbie?.

I do like the look of the MVVS stack fitted, as in the picture in a previous post to this thread. Where do you get one!!.
Comments welcome please.

John Serjeant.