Bike gets hot and shuts down - Help

[Iceman]

Last weekend after 70 miles my Interstate started to sputter like it's out of fuel and within a minute I had to shut it off. It was full of fuel.
5 hours later when it was cold it started right up.
I replaced all 3 coils and it did it again today after 11 miles.
Any suggestions?
Thanks.

[Beardo]

Gas tank vent issue is my first thought. As the fuel gets used up and creates a vacuum in the tank, won't let fuel to the carbs. 

[98valk]

petcock rebuild might be in order.

[gordonv]

Gas tank vent issue is my first thought. As the fuel gets used up and creates a vacuum in the tank, won't let fuel to the carbs. 

Caused by a pinched vent tube. Tank been removed?

Open you case tank cap, place a "straw" into to break the seal, and ride. Or, when the bike stops, open the cap listening to a seal air rush in.

Another member had a problem only in high heat. Seems someone noticed he had an aftermarket fuel filter added to his bike. We are waiting on this years summer desert ride to hear if it's removal has fixed the problem.

[Willow]

Occurring in the heat can also be because of a little extra fuel line.  If the fuel line has been recently replaced with just a little bit (a very little bit) of extra length it can form air bubbles where you don't want them.

[Hook#3287]

I'm wondering why you swapped the coils?  They don't seem to be a concern at all to the thousands of 20 - 16 year old Valks out there. For all 3 to go seems highly unlikely.  

Sounds like fuel starvation to me and it can be caused by several reasons, some already mentioned.

Like Beardo and Gordon stated, try putting a second key in the cap lock, when the stutter starts, open the tank and if the stutter stops, you know it's a tank vacuum being produced somehow.

Then you got to find out what causes it.

[Tfrank59]

Well the majority of responses have to do with fuel starvation --do you think that's what's going on?   You were looking at the coils and changing those, so do you think it's an electrical problem? When a motor cuts out because of fuel starvation it does so slowly and sputtering like you mentioned. When a motor cuts out due to an electrical problem, such as  a bad coil so no spark, I think it's usually abrupt and instantaneous. If you can determine what is lacking, spark or fuel or possibly air, then you're on your way to diagnosing the problem

[hubcapsc]

It would be a "regular" Valkyrie problem if it was your petcock (an easy cheap rebuild) ...

It would be a "weird" Valkyrie problem if it was your coils or something like that...

-Mike

[sutterhome]

You might want to check the main fuse the flat strip one.Not sure what is called.But had one that was cracked and would open up when riding and shut that thing down.Once cool she was good to go. My 2 cents