Lowering the bars on a budget
From Ninja250Wiki
This article will help you lower your handlebars without spending a bunch of cash or making your body into a pretzel via clip-ons.
First, get a set of risers from an early model Kawasaki ZX600, or (most unlikely) a 1986-87 Ninja 250. This set of ZX600c risers were obtained online for $12.00 shipped.
These require a little modification to fit, as the end is slightly curved, whereas ours are straight.
Find yourself a grinding tool and square off to the 250 shape. Once you've done that, it's an easy swap.
WARNING: Kawasaki's usual Big Bunch O' Loc-Tite is on the bar bolt.
Lower than stock; higher than clip-ons.
Finished product looks like this: