XS400 tuning

 

Hi Group,

I have a Yamaha XS400 (mod 84) imported from Germany which is
down-tuned to 20kW. I have the original inlet manifolds, but to
achieve the original max power (45HP) I also need to change the
carburettor nozzles.

Any idea which nozzles to use? Any help hihly appreciated!

Balle of Norway