Is the solenoid integral to the starter? Or are they separate parts that I need to investigate? If it's integral, does this appear to be the correct part?
TRIUMPH ROCKET III STARTER MOTOR SOLENOID REPAIR KIT. The Nippon Denso starter motor fitted to the TRIUMPH can be prone to failure and is very expensive to replace. YOUR STARTER WILL HAVE THE FOLLOWING NUMBER.
I personally don't subscribe to the higher wattage starter option, at least on a std motor
Its going to draw significantly more current and the battery voltage will take an even bigger hit than it currently does. I would say the cons outweigh the pro's. JMO