stock, the starting circuit only gets a ground for the secondary winding of the starter solenoid from the main harness...
id suspect a stray short in the right handlebar switch as a first place to look... sounds like your grounding more than the starter when you press the button.
With the key on, unplug the yellow/red wire at the starter solenoid and ground it to crank the engine, see if that blows the fuse. If that blows the fuse connect a temporary (fused)jumper wire from the black wire connection to the positive battery post. Operate the electric starter and see if that pops the fuse.
incidentally, on a properly functioning electrical system, there is no current in the starter circuit that that passes through the main fuse. both positive sides of the starter solenoid attach directly to the battery...the energizing circuit ground yellow/red is the only wire for this circuit in the main harness at all.
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