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Has anyone braced the 400 frame for more rigidity? I'm interest in supporting the swingarm pivot (D in the pic) and the steering head to swingarm (A). I know its a katana frame but something similar should work on the 400.
The 400 is plenty rigid for the street. You'd get more bang for the buck installing bronze swing-arm bushings, better fork springs, and better rear suspension.
I have slightly over-sized tires and found that it improved handling. I've gotten my knee down at speeds as low as 15 mph