I need more information. Is the bike carburated or fuel injected? Did it just start this or has it been doing this for a while? It sounds like either an ignition or a fuel problem.
If it has a carb, I'd say that it's jetted way too rich or the main jet has come loose in the carb maybe. Tell me what kind of carb is on the bike if it is indeed carburated. I need the year model of the bike and the name of the carb on it. Maybe I can tell you how it's supposed to be jetted. If the main jet has come loose, you will lose control of the amount of fuel going into the engine at wide open throttle.
You may have a bad spark plug as well, either get a new set or have the ones you're running now cleaned. When you pull them out, look and see if they're really black and sooty looking. This is indicating a rich mixture. Check your spark plug wires and make sure they're in the coil correctly. Check of loose connections at the coil primary (small wire connections) connectors. Make sure that chrome cover over the coil is not loose shorting out the ignition.
Fuel injected, I can't help you with that as it takes a special device to make any adjustment in that system.
Testimonial: "Thanx for the info guru. I will try these and let you know what kind of carb I have. It is a 99 electra glide and is carburated"
Tremp1657:
Your bike came equipped with a Kehien CV carb, I may still have the original or it could have been changed to another type. The S&S Super E and the Screamin' Eagle Mikuni are popular swaps. If it's still the stock carb, it will have a large square looking top on it, about 2 inches square. If so, has anyone been into it recently? The reason I ask is that if the "jet needle" is put in upside down, it will cause this problem. But, if no one has messed with it, I'm still putting my money on the loose main jet. Did you buy the bike new? If not, someone may have put a DynoJet kit in the bike and put the weaker spring over the diaphragm. This will allow the slide to raise too quickly causing the problem as well. There are several different things that will cause the problem and figuring out what it is is sometimes difficult. Good Luck!
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