Ride it without the belly tank. It's only an expansion tank.
Just make sure the overflow hose (the one that feeds into the top of the tank) doesn't drop coolant on your back tyre.
I rode without one for months in the late 90s.
In other news I've started getting Otto back on the road.
Have ordered new fork springs from Murph and will be getting the wheels powdercoated in dark graphite or black.
I'd prefer the dark graphite as that should match better with the matt black paint.
If only this damned sciatica would go away!
![Angry >:(](http://zggtr.org/Smileys/default/angry.gif)