Need some ideas on where to go with this. I still need to test my stator and r/r.
Have on the bike: TPE stator, MOSFET R/R, Two-Wire mod, AGM battery... all about 2 years old except the wire mod.
Below is a quote from me in another current thread by mick.park with similar symptoms.
mick's thread: https://www.vn750.com/forum/19-electr...ml#post1123306
Part of my post there today:
I'm almost at a loss for ideas, as I now have a very similar problem, starting yesterday. It's the darkest charging brownout I've ever seen, around 12.5-13v hot/idling with the fan on. Once the fan shuts off, the voltage is 14-14.5v.
What actually tipped me off to a problem ... The engine suddenly began popping from one cylinder on decel, and sometimes popped back out of one carb on takeoff, with a poor idle. I naturally thought it was the carbs again, which I just cleaned. As soon as the voltage went back to normal, it ran and idled fine, with no popping/sneezing.
While checking on possible carb problems, I unplugged the front cyl. spark plugs and determined it was that cylinder doing the popping, but it was at least firing.
Just before deciding this was a voltage problem, I dumped 3.5oz of seafoam into the tank. Meanwhile the bike had cooled and voltage became normal, so it ran fine immediately on startup for that test drive and for the next 20 miles. Was ready to declare a seafoam miracle, because it seemed just having it in the tank cured the problem. As soon as I got into slower speeds and the fan kicked on, brownout to 13v again. Back up to 35+mph for a minute... 14.5v. Going to start a post of my own so I don't get too far afield here with my own headaches.
I've got some testing to do, but for now I'm thinking fan/fan relay/JB .. or I'm losing the stator or r/r. Maybe my battery is getting weak, the bike has been parked a lot this summer.
I'm all open for suggestions if the stator and r/r check out good, and will start testing ASAP. JB finally bit the dust?
I thought I was immune to this dammit! (charging problems)