MechN

Yeah thanks that what I thought, I only ran it with the new battery for half a minute max to see if the voltage was ok, so I imagine that one will be fine. I actually drove the bike with the previous battery for quite a bit and turned it off running before I found out the battery was slowly expanding so I think I might have been lucky and only the r/r and the battery died (it was actually still charging/working). We'll see as soon as I have found a new r/r to order. I am definitely installing a volt meter now btw, I feel it should be standard on the dash, might have saved the battery and prevented any worse (pretty sure I went at least 20 km on a battery being charged with what, 40 volts?).

I should also say I measured the rectifier resistance (0.5 ohm) and the diodes (closed) and this seemed to be all correct

So i bought a new battery after the previous one died, revived after push starting and then grew significantly in size. Now i just put a new battery and when i start it the voltage starts from ~13 V and slow goes up to 16+ (in not more than 30 seconds). Is a fried rectifier the only possibility or are there any other things i should check? (i checked the rectifier for visual damage after the first battery but I didn't see obvious burns etc.) thanks! kind regards.