787 died at wot - now 12v low

[610Mike]

96 GSX w/ 787

Rebuilt the carbs (genuine mikuni) and changed the grey lines
Ran great about 10 hours

Started stumbling around 4500/5000 rpm ... did not replace fuel selector switch when doing gas lines, but suspecting that may be the issue, I switched the fuel selector switch to reserve and it straightened out for about 10 mins.

Was running wide open and died. Could not restart - turned over but never started

While trying to restart noticed 12v low was flashing - has not done that previously.

With ski off, attach key, two chirps...no 12v low. Press starter button and ski turns over, but does not start. 12v low begins flashing.
Battery checks out. Recently cleaned connections.

Before I start chasing fuel delivery issues, what am I missing with the 12v low flashing?

 

[mikidymac]

Your battery is probably a little low is all.
If they voltage gets too low it’s possible to crank but not fire the ignition.

12V low will not prevent it from running by itself.

 

[610Mike]

Your battery is probably a little low is all.
If they voltage gets too low it’s possible to crank but not fire the ignition.

12V low will not prevent it from running by itself.

Thanks for the quick reply.

The 12v low persists with a fully charged battery as well as witha battery swap with a known good battery.

 

[Ckrawiec]

Thanks for the quick reply.

The 12v low persists with a fully charged battery as well as witha battery swap with a known good battery.

Ah, the dreaded 12V low problem...here are some items for your reading pleasure...FWIW.

These skis are very sensitive to voltage, so good batteries and properly performing charging systems are key to keeping these skis starting and running well. If the charging system is not doing it's job of keeping the battery maintained then the ski is feeding off the battery (instead of generating it's own electric power), so eventually the battery suffers.

Don't assume that a battery is good just because it meters out to 12.6/7/8 volts in a static state, it could have a bad internal cell that is not allowing full voltage for the operations of the ski. Simply have the battery load tested at an auto parts store, that'll tell you quickly if the battery is up to snuff. After that, you'll need to dig into the charging system components.