shudder

Bought a 2005 SV1000 with 17 000Km on the clock - When Idling there is no engine knock/shudder from cold start. Listening with a Screw driver on the clutch cover I can hear a slight knock/shudder but when I pull in the clutch it is gone. How ever between 2500 and 3700 RPM the bike has a loud...