RRP (Rosini Racing products), Kessler, and Pro Pilot.
I'm not recommending any of these, just giving you a place to start.
RRP used to tune ATV suspensions. I would call them first.
Kessler does some of the best bike suspension tuning around, but he admits to having limited experience with ATVs.
PP does mostly bikes and has a following in NJ. I'm not one of his followers because he did questonable work for me years ago.
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2004 Yamaha YFZ450
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