Sounds like a gummed up carb. Rebuild it and do a complete tune up.

 

The carb may have a torn/leaky vacuum plunger diaphragm.

 

I'd start by running out that tank of gas and running ethanol free high octane. Assuming, of course, you're not already running pure gas.

 

That won't hurt it, especially when the engine's initially warming up. One of Harley's tests is to idle these bikes all day in the Arizona heat. Oil is still circulating and going through a baffle plate in the oil pan, taking time to cool before returning to the engine.

 

Well I hope its as simple as running some carb cleaner thru it. Ill report back

 

Dude, what year is your bike? STOP until you answer this question. Don't put no stupid bull **** in your gas tank, because I have a pretty good idea what your issue is.

 

I haven't bought anything yet. I have a 2001 Dyna Lowrider.

 

The bike in question is a 2001 right? The bike with the sputter issues?

 

Yes its a 2001

 

Ok, I figure it was an evo as intake leaks are a common problem, but twin cams share a very similar intake set up as evo's, carb'd twin cams anyways. You say when you pull the enrichener out, that the issue goes away. This tells me that you have a lean condition and the engine is starved for fuel. While it may be a good idea to pull the carb apart and clean it, which means replacing the jets (theyre too cheap to bother cleaning), soaking it in cleaning vinegar for a while, replacing the float needle and cleaning the needle seat, and a new bowl gasket, I would do this first.

Fire the bike up, warm it up. At idle, spray some WD-40, or brake cleaner (NON-CHLORINE BRAKE CLEANER!!! SUPER IMPORTANT!!! YOUR LIFE COUNTS ON IT!!!!) around the intake manifold where the flanges meet the heads. If the bike sputters or stumbles, you have an intake leak, and you know what your problem is. Clean up your carb, and replace the intake gaskets. Because the enrichener fixes this issue you're having, it has to be an intake leak. I would still clean the carb anyways though.

There is no stupid snake oil fuel additive or cleaner that you put in your gas tank that will fix these problems. Those things are for stupid people with no mechanical knowledge or ability but have all the money in the world to spend.