Vibration/Shudder around 3500rpms

I recently picked up the Speed Triple in trade, it was a straight trade for my 03 KTM525sx. It's a 98 with only 4700 miles on it. Bike runs fairly decent, some off-idle stutter but the thing the drives me nuts is this shutter/vibration thing that happens somewhere around 3000-5000 rpms depending on if I'm accelerating up a hill or a flat. Seems to be related to the load on the machine. If I'm real delicate through that rpm range and riding on level ground no shudder.

I've seen some other comments around the web of some people having this same symptom, but have not seen any fixes. My guess is it's clutch-related.

Anyone know of a fix ?

sounds like fuel injection to me. get a pciii & a custom map and that will go away. another good solution is to buy a tuneboy. harder to get a custom map done at a dyno shop but more flexible otherwise.

I've got a 98 t-509 that does the same thing, although it usually does the shutter from about 2000-3500 rpm and then at about 4000 I'm smooth as silk. I just don't drive it in that rpm range and i've never had a problem. bike has 23k on the clock and runs like a top.