Question about 2001 Harley Davidson FLSTF - FLSTFI Fat Boy

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2001 harley fatboy caugh and pops back through throttle body when cold. runs find when hot.

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If you try to ride the bike or rev the engine up while it's cold, this is normal. Most engines will do this because the mixture is lean for a cold engine. When you start the engine, allow the engine to warm until it goes into the slower idle speed.

Good Luck
Steve

Posted on Nov 10, 2010

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Ok i have a 2001 fatboy i want turn throttle down so i can ride it until i get use to it then turn it back up to normal


well some have a small screw with a nut holding it tight by the throttle. Some times you`ll have to loosen the throttle cable with the cable adjuster by the carberator.
Hope this helps, God Bless :O)

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1 Answer

My 2001 Fatboy runs great on the highway but when I start to take off the engine cuts out. Also when I downshift the exhausts pops really loud


If your bike is equipped with a carburetor, your accelerator pump diaphragm might be worn out. Take your breather and air filter off so you can see into the carburetor. You'll see a brass nozzle standing up just inside the mouth of the carb. With the engine OFF, crank the throttle to wide open and watch to see if a stream of fuel is squirted from this nozzle. If not, your accelerator pump on the bottom of the carb float bowl needs to be rebuilt. The loud pop you are hearing from you exhaust is probably being caused by an air leak in your exhaust system. When you back off on the throttle at high speed, an extremely rich mixture is in your exhaust system. So rich that it should not be ignitable. If your system is sucking air somewhere, it leans this mixture into a combustable mixture and it ignites causing the pop. Check the gaskets and connections of your exhaust system.

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1 Answer

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1 Answer

Carb popping and spuddering on start ups sometimes.


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Sounds like a mapping issue with whatever f.i. add on you have. could also be the pintle sticking on the throttle body. take the air cleaner off, look at the inside of the throttle body. at the top there will be a little hole. that's where the pintle is. it retracts and expands for cold starting and hot idle as well. if you turn the bike on and off it should cycle. ( extend and retract ) if it doesn't then the pintle needs to be replaced.

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