[dhgeyer]

S-40 shocks are made for a different, heavier bike with a different suspension system. Installing them on a GZ250 will likely affect handling and ride. This could be dangerous. When engineers design a vehicle, they have to make sure everything matches in order to get stability, particularly when cornering. I would not put any suspension components on any bike that wasn't made for it, or at least made to be compatible with it. That doesn't rule out the aftermarket. Even when you buy aftermarket suspension components, they are designated by the manufacturer for certain bikes. The problem is that for this bike there isn't much of an aftermarket.