$$ of boyesen rad valve
$120 + shipping from rocky mountain (add 'mc' and a dotcom).
I paid considerably more for the one I just got...but I'd rather spend my money locally than with a dotcom.
The '89-01 200/'97-01 220 is a RAD-14XA. It comes with pro series reeds.
Improvement on my 200 was much better than 'marginal'..but I had the RB carb mod to start with. Bottom end pull AND snap was a large step up.
To each his own. Maybe riders that don't like the rad valve didn't rejet right..I have no idea. I know it works like a champ in my 200! Rates up there in the 'biggest bang for the $' category.
Oh...to be fair, I also retarded my timing a notch. The bike ran better when the rad valve was put in..but ran better-n THAT with a timing change.