701 spark traveling up the pulse line

[Justinvan_]

Maybe someone can help. I have a 1994 701 61x motor that fires over with 150psi in both heads and a carb rebuild. Fires right up but runs like crap. Seems like its losing spark. Anyway I've noticed a spark that runs up the pulse line into the carb. This can't be good and probly the reason why its running like crap. I don't know what this means or why it's happening. Has anyone else seen or heard of this before?? Please help

 

[vomitspot]

spark in the pulse line
now thats a 1st for me ?

 

[Justinvan_]

spark in the pulse line
now thats a 1st for me ?

Yeah its like a fireball blowing up the pulse line. Can't find anyone that's seen this before

 

[yamanube]

Check your ignition timing (stator position) and make sure your flywheel key is installed.

 

[LBS4]

Not trying to be smart but can you take a pic &/or vid before you fix this? I'm honestly shocked & amazed to hear this is real.
LB

 

[DAG]

Now I've hurd everything

 

[Justinvan_]

Not trying to be smart but can you take a pic &/or vid before you fix this? I'm honestly shocked & amazed to hear this is real.
LB

Yes will do. Ski runs but runs like poop. Constantly dies out like its a spark issue. Just had the carb cleaned and top end reads 150psi in both heads. Will upload a video when i get home

 

[DAG]

If you truly have balls of fire puffing out the pulse line only thing it could be is a loose stator plate or a sheared woodruff key but even then it seems far fetched.

 

[Justinvan_]

Everyone check it out

 

[Justinvan_]

 

[SXIPro]

Firefly get in your gas tank?

 

[Big Kahuna]

What is the wire attached at the bottom?

 

[Factory928]

Wtf how's that not catching fire?

 

[Wake Rider]

When you shut it off, have you noticed any smoke coming out of the carb? If so, it might be the reeds.

 

[smoofers]

I'm going to agree with DAG and yamanube and say it's gotta be timing related, especially if the ski runs like crap. Most likely a sheared woodruf key.

 

[yamanube]

When you shut it off, have you noticed any smoke coming out of the carb? If so, it might be the reeds.

The pulse line is on the outside (crank case side) of the reeds, so while the reeds might be bad, flames in the pulse line is not indicative of bad reeds.

 

[Vumad]

Not sure why some are making a big deal about this not being real or now having heard everything. We run spark arrestors for this very reason.

 

[yamanube]

It's probably not a bad idea to rebuild your carb once you figure out your issue. Maybe move that primer line out of the fuel line feeding the carb to the return line as well.

 

[Justinvan_]

What is the wire attached at the bottom?

Ground wire right by the pulse line..

 

[Big Kahuna]

Why is it attached to the pulse fitting?