Hi I am looking for fuel pipe union that fits between carbs 1and2 and 3and4 it is no longer available through honda its fitted to the VG carbs on the 600 fk jelly mould model its 1"7/8 long and has a diameter of 7/16 its the petrol union not the air union.

 

You might get better traction in the actual 600 section for the 1989 models. Just a thought.

https://cbrforum.com/forum/cbr-600f-15/