I'm really not that much of a mechanic, but I determined that a front sprocket change would be both easier and more economical. Although I did have a bit of a hard time breaking the front sprocket nut, a three-foot piece of conduit pipe attached to the proper socket wrench did the job. I also did the same on my previous ride (Ninja 250).
I don't recall what the rpms were prior to the change, but now rpms are 5000 at 70 mph. I think it was a drop of about 500 at that speed. I've been very satisfied with the change. Good luck and welcome to the forum.
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Dark Arrow Slip-On Exhaust, Spencer's Seat, Alaskan Sheepskin Buttpad, Givi Windshield, Givi E460 Topcase, SW Motech Crashbars, SW Motech Alu-Rack, Cortech Sport Soft Saddlebags/Tailbag, 16T Front Sprocket, Kawasaki Z-1000 Mirrors, Speedy's Handlebar Riser, Speedy's FlatFoot, MFW Highway Pegs, Gerbings Heated Gloves