It sounds to me like your chain has stretched unevenly. I had the same issue on my ST2 and it behaved like you describe.
I got my chain and sprockets from California Cycleworks and highly recommend them. Chris Kelley doesn't sell anything that isn't top quality and he has very good prices as well.
I don't know if you're going with standard gearing or not. Stock is 15/42 and I found that 15/44 felt best on my ST2. I had previously tried 14/42 for a short while but felt that 15/44 was the best all around gearing for me.
__Scott R. Nelson, Folsom, CA
--- In st2_owners@yahoogroups.com, "jerea99" <ducati@...> wrote:
>
> I noticed a couple of issues riding my 99 ST2(44,000 miles) back
> from Cape May, NJ when we were evacuated for Hurricane Irene.
> In 1st gear the bike was jumping and lunging for the first few
> thousand RPM's. Also when accelerating in higher gears, like when
> entering a hi-way from the entrance ramp, in the higher gears at
> higher RPM's the bike was shaking unusually hard. When I got home
> to Rhode Island, it ultimately came down to the chain, which was
> incredibly loose. A free play of way over 1.09", measured at the
> 1/2 way point of the swing arm. I tightened it up and all problems
> are gone. But the rear sprocket needs to be changed, so front
> sprocket, too and I will also change the chain, even though 16
> links measures within the work shop manual tolerance of just
> over 10".
>
> So, I am asking for your opinions on what to buy and where to buy.
> Thank you in advance.
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