Good call, DRam. I've never done the line switch before, but can see how it could happen. You may be on to something there.
Other thing is float problems like you said.

Ironman, I can also probably snap a couple pics of the placement of my vac lines and such, or at least give a description when I get home. It may help, too.

 

The petcock vacuum line comes directly off the #1 cylinder vacuum port directly to the petcock on a non-CA bike.

If you had a tear in the diaphragm, I would think that the vacuum port would suck fuel past it and into #1 and not #2.

 

True, but I wasn't talking about the vacuum line to the petcock. I meant the fuel supply line from the petcock to the carburetors and the vent line that runs from the carburetors down toward the swingarm. If those are reversed fuel runs into the float bowls through the vent port and can flood cylinders. The bike might run for a while, but will eventually flood out.

Again, please don't ask me how I know that. It's just too embarrassing to talk about.

 

Just one of many. Sigh.

 

Over the years, bikes have given me a truly colourful vocabulary..........
The 1000F is no different.sigh

Oh and TBT the petcock vacuum goes to no 1 carb on the emission bikes too.

 

i got the fuel lines going to the bottom of the carbs and the vent lines r on the top portion of the carbs. but now that i think about it i got the vent lines plugged cause i thought it was a vac line. oops!!

 

r the carb vents the big ports between 1 and 2 , 3 and 4??

 

Yes, and should have pipes on them

 

Backwards, the fuel comes in on top and the bowls are vented from below.