LRMzx636

I ran out of gas, I knew it was low, on the way to the gas station, its happened before since my fuel light does not work properly. So I put some in it from a can from a buddy, bike now runs on 3 cylinders.

the 4th injector does not produce enough fuel to get adequate fire. I swapped plugs, tested the coil packs, all have power etc.

This is he kicker...

I can unplug the 4th injector plug and there is no change in bike performance... so. I took the throttle bodies off, cranked it over, and fuel does spray out, im not sure of the amount.

Ran some seafoam in it to help clean it out. Im going to try and remove the fuel rail and clean it out, I didnt have a phillips head with me that would get in there without stripping them.

What are your thoughts?

CLeaned the injectors, cleaned the fuel rail, swapped fuel pumps. Problem persists.

ToKwik

I'll think I'll take a wild guess and say.................................



Bad coil stick!



I'm still not too sure how that got missed yesterday.

LRMzx636

Its hard to focus when your wig keeps gettin split

old man roger

i was gonna say switch #4 injector and the # 3 injector and then if the dead cylinder was then 3 you would know it was the injector and if not it was electrical but it sounds like you already found out what it was

ToKwik

Yeah, he did that.

It was a bad stick coil in #4.
It was sparking (I tested it myself), but apparently not sparking enough.

For future reference...
Primary windings: 1.2 - 1.6 ohms (Lornes = 11ohms)
Secondary windings: 8.5 - 11.5 kohms (Lornes = 10ohms)

Swapped it out with a known good stick and smoothed that cylinder right out.