M90 Handlebar weights

I don't know if the M90 uses the same bars as the 109 or not. If they do, they have welded in weights, but they aren't too hard to remove. After removing the grips you can look underneath the bar and see one or two depressions. Those are holes that were drilled in the bars, then the weights inserted, and welded to the bars through the holes. Just take a drill and drill the welds out.