I have a 93 K75 that I bought about 6 months ago. It has been well maintained by the PO. as I did find some water in the fuel. My throttle response improved after doing this and was hopeful the problem was fixed. Another symptom is backfiring through the exhaust on decel.
When decelerating close the throttle completely; a partially-open throttle often causes backfiring. The throttle position switch might need adjustment.
If water was in the fuel, the drain system might be clogged. When the fuel cap is open a hole will be visible in the left side of the cap assembly flange. That hole is designed to drain water accumulating around the cap's perimeter by diverting it through a pipe that goes though the tank then exits as one of the two ports beneath the rear of the tank. It either deposits water into a cup hanging from the frame or a hose is attached to it and the hose should exit behind the right footpeg plate. Check the pathway to be certain it's open.
The crankcase breather hose should be checked for cracks and replaced if it has any.
Clean your bike's 4-pin under-tank connector and verify that it is a tight connection; don't just look at it. The same goes for the ignition switch connector under there. DeoxIt is usually recommended here.
This bike might need a tuneup consisting of spark plug replacement, air filter cleaning or replacement, throttle body balance and throttle switch adjustment. When were those performed last? Have you looked at the air filter?
You'll sort out this problem. Plenty of information can be found in the
Repair Guidance Master List section.
