Kawasaki vn 1500 drifter fuel injected it has hesitates under throttle

SOURCE: 1999 kawasaki Drifter Vibration

I have owned my 1500 since new, the vibration around 50mph I would say is normal for this motor..I think it is just the resonance of the engine at this RPM...On my own bike I replaced the U joint( which wasn't defective) wheel balance and brg problems eliminated,etc. As for the remaining vibration by pulling in the clutch and the vibs go away.Gagets stated in an
e-mail it could be rubber harmonic balancers in the engine that got brittle may be the problem..Also I think worn motor mounts may contribute to the problem. My only concern is getting stuck somewhere...My drivetrain is ok so I'll live with a little vibration until I have to take the engine apart for some reason.

Testimonial: "Thanks alot! Also is yours the 99'?...I heard they have a defective clutch (mines slipping) I wonder if that may be a contributing factor???"

SOURCE: 1999 Kawasaki 1500 Vulcan Drifter clutch slips

Well i would say the clutches have sat dry to long. You may change the oil and it solve the problem but more than likely new clutch discs.

Testimonial: "Thank you very much!"

SOURCE: hard to start when it is hot

try doing a compression test, could be small valve clearances, or bad rings

SOURCE: 2002 kawasaki vn 1500 classic.electrical fault.

Check the ground wire at the battery, at the negative post at the battery you'll find a smaller (black/yellow) wire, it must be plugged into the main harness, it might have become unplugged, the connections will be right close to the battery.

SOURCE: Kawasaki ZZR1100 C3(1993). Bike

Yes, it should rev much higher. All your driving problems are caused by an air/fuel mixture problem - it's too lean.
You will have to clean the carburetors - the jets are surely dirty by now - and check the level in the bowls. It would be a good idea if you would also clean the tank.