GS750 generator

[andyp62]

Hi all.
My 1977 GS750B generator has melted the rota, despite trying for 2 days now i can not budge it from the crankshaft, has anyone any tips to get it off before i have to take the whole bottom end to a local engineer and ask them to try get it off?.
Thanks
Andy

[Nessism]

Did you buy a rotor puller?

[Rich82GS750TZ]

I gotta ask. Is it the coating of the stator windings that’s melted? Or actually the rotor? Not doubting. But I wanna see pics, just for my own education.

[andyp62]

not a puller as such but tried the slide hammer as advised in the workshop manual

[andyp62]

The black resin that is around the outside has melted and broken away getting the case off

[Rich82GS750TZ]

WOW. That’s a first for me.

[bwringer]

not a puller as such but tried the slide hammer as advised in the workshop manual

I've never seen one melted like that, but that's not why it's stuck.

In my experience, a slide hammer simply does not and cannot work (I once tried an absolutely gigantic slide hammer on a scrap engine; the rotor did not budge, but I'm pretty sure the crank and cases were damaged). You need a high quality threaded puller, some grease, and an air impact.

I don't know which puller is correct for your engine; if you believe Google, it seems to be basically a large hardened bolt with 16mm x 1.5mm threads. For these bikes, I use a grade 12.9 socket head bolt (I have an impact-rated bit socket for this.)

A low-quality puller or bolt will only destroy itself.

Again, don't believe me or Google; measure those threads and verify what you're dealing with.