I just took my givi crash bars off the other day, due to the fact they were in the way of the 900RR header. And now Im wondering if im missing a bracket from the motor to frame. Ive looked at some pics of other bikes but cant find a good close up.
..... The nut on the right --- isn't part of the 9'er. I'm guessing its threaded rod/nuts from the Givi's? The 919 normally comes with a plastic cap over that hole. Many people remove these caps and there is a hollow frame piece that goes through to the other side ---- this hollow piece is used to mount frame sliders by a few companies because attaching frame sliders to the motor mount has caused cracked engine case issues. I'm sure the Givi's also used this in their mounting setup.
The frame and Engine mount connection (which you can see in your photo) is behind what you have circled..... all looks good.
FYI, that area really benefits from an added frame support!
The engine mounting bracket that sits a few inches behind that spot is made from fairly thin sheet metal and is the first part that breaks on high-mileage 919's. There is significant frame flex there and that repeated stress causes stress cracks. I'm sure handling is impaired by that frame flex as well.
I've built a few versions of a frame truss to fix this.
The first crude version:
And here's the final version:
Those pics are just awful because some knob who looks just like me painted them gloss black. These are made from 1/8" wall, 1.25" square tube and are really easy to make. I haven't have a chance to test them but they will definitely make the frame stiffer.