What is the butter fly on the intake for? I saw some where that this gets removed and blocked off? Does this help power or economy or what's the go here?
Also are there any catch tanks for the rocker cover breather that one can buy and fit easily? I'm not too keen to hang a pipe on the road like peeps do cause I have a few motor cycles and don't want slip on intentional oil spils when wet.........

Thanks in advance.
Bernhard