My 2006 Carbed FLST dies at a stop, after I have ridden it for about 30 miles straight or so. The problem never shows up when I have ridden it short distance. I installed a Mikuni HSR42 on it because the factory one had a crack in the bell behind the air cleaner. I bought the bike used to I'm guessing it got over torqued at some point. Also the bike has a screaming eagle air cleaner, and pipes. Also I noticed after I left it idling on the side stand, when I picked it off the stand it sputtered and died. The tank was full with 93 octane, so I know it has gas in it. I'm at a loss, any help would be appreciated.
https://www.jpcycles.com/product/400...carburetor-kit

 

Does it restart after dying? Maybe some vapor locking..?

 

It will but takes a couple cranks to get it, what would cause it to vapor lock? Never had a bike do that before. This is my first Harley, so I am learning as I go.
UPDATE: I found a video talking about the vent in the gas cap, mine was rock solid. So I pushed a little harder and it now just rattles around in the cap. Do I need a new cap now?

 

Hard to assess from an internet description, but if you think you damaged the gas cap, get a new one... a poorly venting tank can cause what you describe.

You also have a vent nipple on the front of the tank, that ends with a vapor valve, but I believe that controls the release of vapors from the tank, not for the tank to "breathe".

I always thought vapor lock only happens in sections of metal fuel line, but I could be wrong.. So, when you installed the Mikuni, did you replace another Mikuni or the OEM Keihin CV40...? I ask, because with an other than OEM carb, the fuel line may have been routed differently to accommodate the new carb. Whoever routed the fuel line, if different than the OEM fuel line route, could have it touch/pass close to a heat source that could cause the gas in the line to vaporize, thus form a vapor lock...

Good luck with the fix.....

 

I ordered a new gas cap, the bike was doing this before I installed the carb. But if it hadn't been for the issue I would have never seen the crack in the original. Hopefully the new cap will be in this week, and I will take it for a spin and see what happens.

 

Not saying its vapor locking, but gas in the carburaor bowl can actually vapor lock if it gets hot enough. It's not just limited to fuel lines..

 

I'm going to continue to troubleshoot, see what happens. Thanks for the help.

 

Could be electrical. Like a coil going bad or a switch.

 

I'll keep that in mind also, but the vent in the cap wouldn't move at all, until I pushed it real hard. Now it just rattles around in the cap. The new one is on the way, will keep ya'll updated as to what happens.

 

I think you can use a hairdryer to see if the coil is breaking down with heat.