What should i do with this oil breater pipe?

A small K&N type oil filter or link to a catch tank.

Engine is a 2003 R1.

Pull it off and stick a little mini moto cone filter on it

Feed it into a catch tank and put a breater on the pipe out of the tank. R1 has a tendency to push oil up there under extreme conditions (mine only does it a bit on track and never on the road). With the catch tank you'll know how much has come out. With just a breather filter you'd get a bit of a mess.

adrian

^^^^ what he said, helps you keep an eye on whats the engines doing, if it starts breathing heavy you will see the signs.

I've had a catch tank on mine for 3 year. Precisely zero has come out of it.

Mine has never seen a road yet, but i've routed that pipe to a ctach tank with a breather.

Glad to see your r1 conversion is going well Major Stare. Recocnise you from years on the wscc forum back when I had my pre lit