In California we have vapor recovery systems on all of the gas station nozzles. Unlike my previous K1200GT, the fuel cap on the K1600 doesn't open very far and makes it very hard to get the large bellow assemble around the nozzle past the protrusion on the bottom of the cap. You can compress the bellows by hand to start the fuel flowing but this can leave the nozzle very shallow in the tank and you risk an overflow before the automatic cut-off.
I took a look at the cap design and realized that there is a very simple solution. Here is the fully opened cap angle before starting.
I took apart the cap assembly (4 screws holding ring to tank, 2 screws from below holding hinge mechanism to ring). Be careful of a couple of small springs in the hinge mechanism. I then used a small, flat needle file to carefully file steps into the two tangs that limit the cap opening. I took off a little material at a time so that the cap doesn't open to far, hitting the tank ring, and possible damaging the paint on the cap. The following photo shows the step that I filed. I didn't take a "before" photo but you can easily look at yours to see how it started. Be sure to do this to both sides evenly.
Here is the result, after re-assembly. Much better and the ease of fueling is greatly improved. I hope that this is helpful to someone.
I took a look at the cap design and realized that there is a very simple solution. Here is the fully opened cap angle before starting.

I took apart the cap assembly (4 screws holding ring to tank, 2 screws from below holding hinge mechanism to ring). Be careful of a couple of small springs in the hinge mechanism. I then used a small, flat needle file to carefully file steps into the two tangs that limit the cap opening. I took off a little material at a time so that the cap doesn't open to far, hitting the tank ring, and possible damaging the paint on the cap. The following photo shows the step that I filed. I didn't take a "before" photo but you can easily look at yours to see how it started. Be sure to do this to both sides evenly.

Here is the result, after re-assembly. Much better and the ease of fueling is greatly improved. I hope that this is helpful to someone.
