related thread:

https://www.hondashadow.net/threads/...button.573587/

 

Thank you - yes I’d seen that one. It backs up my initial thoughts but it just seems odd when I’m getting decent voltage both static and while cranking. I’m going to investigate further today. If I can’t find anything then I’ll just get a new battery so that I can either solve it or eliminate that possibility.

I’m also intrigued with the pictures above from the VFR getting 13+ volts. I would expect that with engine running but not while just standing. That’s a monster battery!

 

Yes, lithium batteries have fully-charged voltage of 14,3v. Highest my charger goes is 13,8v for lead-acid batteries. So it'll always be slightly under-charged, which is fine, extends life not being at 100% all the time.

 

Good news - seems back to normal.

Started this morning with lots of voltage checks, including hooking it up to a car but everything stayed as before and there were no indications that I was on the right track.

Then I traced the main earth as I wanted to check the connections. It goes straight to the starter motor and is then passed to the chassis. But getting to it would mean removing throttle bodies, draining coolant and removing thermostat housing.

So, desperately hoping I wouldn’t need to do all that, I started pulling apart every connector I could find and cleaning them.

All connectors looked good until I got to the connection from the rectifier/regulator output to the loom - this one looked a bit dry with light corrossion. Cleaned it up, reconnected it and the bike started properly.

So, assuming this wasn't just a pure coincidence, can anyone explain why a dodgy connection from the regulator/rectifier have caused this symptom? The connector that I cleaned didn’t include the 3 feeds - it just had the +ve & -ve DC out.

I can well imagine a link but I can't quite come up with a solid explanation. It would be comforting to be able to explain it!

 

In case it helps anyone else, this was the connector that I cleaned (circled in yellow).

 

Redo voltage measurements. Bike off and during cranking.

May be one of other connections on way to ignitor. Just unplugging and re-plugging connector often is enough to clean them.

 

There's no change in the bike off reading. The bike doesn't now crank long enough to be able to get a reading while cranking!

 

awesome!