Hot Start Problem Fixed.

SPEED TRIPLE 2007.
After 18 months with no fix to an intermittent hot start problem , Its finally sorted.
Wont bore you too much with history , Ive heard and tried all the fixes with heavier cables , bigger batteries , reg/rec upgrades etc etc etc.
The problem is the poor design of the standard denso starter.
Every starter I have worked on has the brush plate or the negative brush in firm contact to earth.
Either bolted into the starter body or the brush soldered to earth.
Not so the denso.
Disassemble one and you will see the brush plate is in no way connected to the starter body/earth other than being held in place when the starter is assembled.
The only fix , as well as polishing the brush plate and contact surfaces of the starter body before assembly is to solder a wire directly to the earth brush where it contacts the brush plate, drill a hole in a suitable position through the starter motor body aluminium base and connect the wire directly to earth outside of the starter body.
No more hot start problem and it starts quicker than ever before.
Hope this helps someone.
Googling Speed triple hot start problem seems to show theres a LOT of people out there clearly frustrated.

 

^^^ That is a good observation , the wire is about one half the guage of the brush wire.
It travels only a short distance to earth unlike the other battery leads coming down from under the seat and also interferred by the starter solenoid circuit.
The starter brush wires are also way smaller than the battery cables.
What I assume is happening over time the brush baseplate gets a patina on its surface and as its only held in between starter body sections and not bolted or soldered , loses its conduction surface.
Add heat to the equation and it wont pull enough.
Its possible that without using the extra earth backup wire that just polishing the brushplate and all surfaces in the starter body it contacts would fix the problem .
Over time Im thinking the problem would return.
Hence the earth lead.