Yep dodgy battery is a distinct possibility, and a faulty ground lead would hamper the starter as well, but note the dim light on cranking, maybe time for a recon on the starter itself, do they have brushes like a car starter? If so then replace them, and CAREFULLY clean the commutator. Do the earth lead first, then try starting with the car battery only next. Then look to the starter motor itself. Also check all bearings and bushes in the starter while you're there, when they wear the starter will draw more current too.
Most of these things are gradual and insidious, they sneak up on you and all stack up 'till collectively they becoming an issue.
I have a GN250 which I wired a switch in the headlight circuit so I can flick it off while starting, much easier on the battery.
(I know some smaller bike starters are just reversed alternators, not sure about this bike tho.)
A man without religion is like a fish without a bicycle
Bookmarks