I went out to my 05 750 last week to a nasty surprise. The starter button was completely unresponsive to anything and the bike wouldn't turn over at all. I tried all the normal stuff. Made sure the bike was in neutral, held in the brake and clutch (just in case), tried with the kickstand up and down. Nothing.
I then started tinkering on it. The only thing that got it to turn over briefly was tapping on the throttle housing. It worked for a few seconds and then went back to unresponsive. I figured that wiring that led up to the housing was bad or must've corroded or something so I ordered a new right throttle assembly and pigtail.
In the meantime, I cut apart the pigtail of my old throttle assembly and started jumping the wires to simulate the starting connections. I could touch the black/red wire to one of the black wires and it would turn over just fine, so I figure it must be localized to this pigtail harness. Unless I'm jumping the wrong wires...
Fast forward to today, I get the new throttle assembly. Plug it in and press the start button while it's in neutral... AND NOTHING!
I don't quite understand what else could be wrong. If I can jump the wires from an old harness to get it turn over but a fresh, brand-new-lookin harness won't do the trick, what else could it be?