You are correct. Hili-Bars stretch both the cables as well as the brake hoses to their max. Unfortunately, almost everything on a GL1800 is cut to it minimum length. Such examples are wires, cables, hoses, and emission hoses. To my knowledge, many custom seats move the rider's riding position back about 1 inch. When done, if your cables and hoses passes these tests, you should be good.

- the throttle needs to snap the throttle body closed when the bars are moved to a full right, full left, and center position.
- if the brake/clutch hoses are under any stress (taught) in full left, full right, and center positions. As well as full fork extension and full fork collapse while under full left, right and center position.