EXUP Worldwide was born from the ashes of the original EXUP Brotherhood – the definitive forum for all those who have interest in Yamaha FZ, FZR, and YZF motorcycles.
i know that the head fill bolt up but was wondering about th flow loss through the smaller valves, the bottom end torque should be improved due to the higher velocity of the smaller ports and the smaller chamber incresing the compression
Do a search 11, I think there's some info here on doing that.
There may be some modification needed for piston to valve clearance.
What's your location?
I may have a workable 1 liter head if your interested. You could PM me if so.