Join Date: Jan 2012
Location: Chattanooga, TN, USA
For #3, I'd be tempted to pull the carbs and go over them. Take everything apart. Spray cleaner and compressed air thru each passage. Then, set your float height. If your float height is low, your bowls can get drained at high rpm causing it to cut out. Set the needle and air mixture screw to stock. The air mixture screw wouldn't really cause the problems you are indicating, but the needle could. If the needle is too high, you are dumping too much fuel to the point it won't light. This could explain the carboned up plugs, but several other things could as well that are no-neverminds. If the problem persists after cleaning out and setting the carbs to stock, I'd move on to spark. The problem is, its hard/impossible to test the ignition system under load. You can test everything statically, but that isn't really your problem.
2018 Multistrada PP, 2012 Hypermotard 1100 Evo SP, 1995 900SS/SP