07 Classic: Bike quit running, lost spark on two cylinders

[TURBO200R4]

Ok, so I've been looking and testing all the connections, haven't yet removed any
coils an now I have spark to all cylinders but the spark looks weak.
So looking for a ground issue, thank you Son of dog for the wiring diagram.

if u have low volts on the positive side (bad splices/corrosion bad crimps) u will have low spark.
the grounded side is direct to the ecu. but if u have a ground prob it could effect the ecu ground.

 

[Tripps]

I initially was going to say coils but two coils, leads, or terminals at exactly the same time seems unlikely, so IDK.

 

[TURBO200R4]

I initially was going to say coils but two coils, leads, or terminals at exactly the same time seems unlikely, so IDK.

u have a pos wire that is spliced to go to 3 coils not unlikely a bad splice would take out one or all of the coils.

 

[TURBO200R4]

just a thought
if your charging sys breaks down then eventually the bat will run down and when the bat volts gets to about 10 the coils/injectors start malfunctioning. have u checked the battery to see if u have at least 12 volts. i know that u said u were cranking w/o plugs and i dought it would take much to turn over with plugs out.

 

[Rumbleboomer]

The spark looks weak on all three so I put it back together to try it, it hits on
number one but won't start, I think I will take the plenum off and try squirting
just a little gas into two and thee to see if it starts momentarily. have the charger
on it, thanks for all the help guys

 

[Bob R]

@Rumbleboomer What's happening with your ride, getting it sorted out yet?

bob

 

[Rumbleboomer]

Didn't get to work on it today, charged up the battery (maybe the cause of the
weak spark) I was thinking I didn't get a half mile after I filled up with gas,
maybe I got some water... I got all the gas I can out of the tank and added a little
alcohol. Tomorrow I will try squirting a little gas into two and three to see if it will
maybe idle for a second or at least pop on those cylinders, will keep you posted.

 

[Bob R]

You didn't lift your tank before this started, did you?

bob

 

[Rumbleboomer]

You didn't lift your tank before this started, did you?

bob

I haven't been under the tank for two mouths or so but before that I had taken the
whole bike apart to install a new alternator stater so I could screwd anything up!

 

[Bob R]

I was thinking maybe a pinched vent line but if it has been a while we can rule that little thing out. Have you ever changed out the fuel filter? I had a 240Z that would run like crap and try to strand me if the filter got just a little dirty.

bob