Update -made that breather by cutting and joining two tappet adjuster caps on top of each other, drilling a hole and then adding the bit of Maes handlebar - the ID of the hole is 3/4" right through -that'll make it breathe! I really get it, and it'll help with kick over too at starting of course. Getting the fettling of it's life presently, but will polish up well, and is only a little taller than a standard inspection cap.
Goes quietly unnoticed, but does the job -which was the design brief...
While making it I thought it should have a name, that was one beer in, by the second I'd decided on one...
Most bits that serve to enhance the performance of these bikes seem to collect one - this looks ok to my mind, and could go almost unseen up there on the front rocker cap, but does the same important job as the 'Elephant's trunk', and is of about same size bore... a good thing.
So, following this thinking, and please don't take offence here mate, I did think to call it the
'Bill made me do it...' ,
but it's lacking that all important catchiness -simply the
'BT breather' for short...which I will fondly forever refer to it as.
Bloody good idea that Bill, thank you -blocked up rear lower oil breather too, and can't wait to fit this tomorrow.