Put a multimeter on the batt when it's running and check to see it is charging at 14 volts or so. The weak spot is the sprag clutch and rectifier. I got the same bike same miles same deal too, only silver. so your red one should be a little faster(to the cops)
It had left the other guy stranded. He said the batt was new, as a fix.
It left me 1600 later. Jumped it, got it home. It had been slow starting and getting worse. It would grab and let go or crank and crank. Fix:
New Rectifier from Ricks' it plugged right in.
New sprag clutch kit from Triumph via Bandit, larger diameter fits fine under cover plate.
Made up heavier #4 wires from marine store Batt-solenoid-to starter. They're as fat as can fit. A 3amp fused wire set from batt(so if by some freak there is a short in the charger it won't catch fire) to a two prong trailer light plug for a small solar charger(reversed charger plug to keep positive post sheilded on bike and have a cover for charger +). a new batt. Don't use a cheap battery the bike depends on good current.
It transformed, starts almost instantly every time. If there is a weak spot it is that situation. It had neoprene on the fairing touching the rectifier so I cut that part off to allow air flow.
I think the sprag took a beating before I got it due to charging troubles, reason why it was so cheap.
The other fellows had no mechanical skill and feared a thousand dollar bill...sprag costs about 500 but is super easy to DIY. Rect. 130 . Wire change likely not necessary but nice.
If you hunt for Decosse rectifier upgrade infornation on forum and sprag clutch stuff you'll see all. Other than that the thing is rather bullet proof. People complain about the focused beams on ramps and dark corners. Thye're fine with me but it is the defined line of the focus that is the trouble not the ammount of light so much...I put a metzeler sport bike tire on the front
to replace cupped origional tire...I like it more every day. It is a really nice machine, the best I ever rode.