Carb kits for CB-1 are complete.
See http://www.litetek.co/Carb_Kit_Honda_CB1_NC27.html
The fuel tube o-rings I only have in black at this time. They are Viton though, and yes I tested them.
A listing for grey bike kits that are available is in the "Approved Traders" section.
cheers
Blair

These look great! I will buy a set for the CB400SF when you make them. I spoke to a friend here with a bike shop to see if he has any of the float bowls you were looking for.

Thanks. Seems to be taking a while to find a float bowl for those. They are the same as the CBR400RR NC29 and the CBR250RR MC22. One will turn up sooner or later.
cheers
Blair