My recently purchased 2004 sportster will sputter and die if you push the choke in, even after warming up. it has the baffles pulled and a screamin eagle intake added. also waht is rhe knob below the tank marked ''fuel and off'' for.
First how long has she sat up before you got it. If she sat up 6 months or longer you may need to clean the carb(s). The valve you are asking about, is called a petcock, it turns the fuel off/on to the carbs. Turn it off when you leave it setting for a week or longer. If you want to leave it sit a lot longer, crank up the engine and as its running turn off the valve (gas) let her run out so the fuel (gas) does not gum up your Carb.s Now back to why she quits unless the choke is pulled out. What is happining is the choke shuts off some of the air going into the carb.s This forces the gas to be pulled in past any stoped up gumed up vents, ports what have you. So she runs but not great. You can try this. Turn off the tank valve start her up, to run her out of gas. Get your hands on a Turkey baster, some Seafoam (it is a fuel cleaner) Take the line off of the tank valve, force some Seafoam into the carbs with the baster. Let it sit over night. Start her up next day, (get her outside she will smoke up the house). Hook up your tank, put in some freash gas. Do it again if its not any better. If after 2x it does not clear up. You will have to take the carb out and phy. clean it. repost if you need help with that.
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