Mine runs strong, pulls like a freight train, idles perfect, for me being use to a slightly hotted old R90S, this K is a power stroker. It had some strange things entered on old service records that have been rectified. Valves were way out of spec, way too tight. All dealer maintenance previous to me. So, like any new used bike, have slowly gone through every bit. After all, it's a machine, it was put together, can be taken apart and fixed.
Last winter tore into it, put '87 front on with the nice integral brace. Swapped out TBs, ECU, FICU, new HES, always following the niggling problem of that tick tick tick once it got warmed up. Cold at start up, smooth as glass right through rpms.
All warmed up, feel it in the bars, just a little knock, hard to describe. In neutral after a ride, twist the throttle up, 2-3-4-5k, and it almost seems like an ignition problem? So, I think a lot about it. New plugs, new wires, plugs always way nice color. Gonna check the coils again tonight after dark, just for fun. It's like a hobby, a mystery. Ran very, I mean carbon black pipe rich. Did lean drop routine and backed off the mixture. Didn't stop the tick.
So now I'm thinking maybe just maybe there's a leaking valve or two since they were so tight. Just glad I got something I like to do.
Forgot to mention, compression is 161,153,156,156.