Hi!!
I would like to know the dimensions of the pipe that goes from the crankcase to the air box.
I have istaled a tyga front tank cover and i have been told that i should put a K&N CRANKCASE BREATHER AIR FILTER to allow more air....
What do you think about this???
Thanks in advance.

I use 16 mm (5/8") diameter hose.

There's no real reason that you'd need to stick a filter on the crank case, but there's no reason not to either I recall a few on here doing it in the past.

But personally I wouldn't feel comfortable knowing that oil can potentially vent all over the engine - even though it is unlikely. I run my breather to a catch tank under the seat unit where it can't escape (if it feels the need).