Question about 2000 Harley Davidson FLSTF Fat boy

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No power when give it gas.

Stock 1999 fatboy except for added cam and Vance & Hines pipes. Problem is when I give it gas, it has no power! It is gutless! It just feels like it is trying to go but just dosen't have the power it should. Also, backfires when starting after a ride or when engine is hot.

Posted by Anonymous on

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  • Harley Davidson Expert
  • 438 Answers

Believe carb adjustment bad & carb needs to be rejetted to exhaust, believe you need to add a higher flow gas valve & possibly new plugs & wires

Posted on Jan 05, 2015

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6ya6ya
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Posted on Jan 02, 2017

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Pristonero
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SOURCE: 2003 Ultra Classic engine backfire when upshifting

go to basics replace the sparks

Posted on Oct 20, 2009

wd4ity
  • 4565 Answers

SOURCE: Mikuni jetting

If it's the Sreamin' Eagle Mikuni, it should come jetted close enough to take your bike to someone with an exhaust gas analyzer. That's the best way to get your card jetted correctly with the extensive amount of changes that you have made on this bike. I would advise that you take the bike to someone that has a dynometer that is equipped with an EGA and have the run the bike up. I would not want the mixture to exceed 14:1 at any time and preferrably run about 13.5:1. It's a bit on the rich side but it will help keep your engine running cooler. I've installed the carbs before but I cannot remember what jets they had in them. Sorry. Good Luck.

Posted on Jan 22, 2010

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atocrxr
  • 135 Answers

SOURCE: Backfiring on downshift. Have true dual headers

I had the same issue on my 1998 RoadKIng, it had true-duels and thunderheaders, looking from the back, the left pipe "driver's side" was a light brown color, while the right side was darker.
On decel it would **** air back in the left pipe and backfire. I removed the right muffler and installed a 1/2" bolt, just standing up in the pipe, then tightened down the clamp, which held it in place, this created a controled retriction, and forced more pressure out the drivers side pipe,,,, no more back firing. The idea works,,,, LOL

Posted on Apr 04, 2010

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Mikuni jetting


If it's the Sreamin' Eagle Mikuni, it should come jetted close enough to take your bike to someone with an exhaust gas analyzer. That's the best way to get your card jetted correctly with the extensive amount of changes that you have made on this bike. I would advise that you take the bike to someone that has a dynometer that is equipped with an EGA and have the run the bike up. I would not want the mixture to exceed 14:1 at any time and preferrably run about 13.5:1. It's a bit on the rich side but it will help keep your engine running cooler. I've installed the carbs before but I cannot remember what jets they had in them. Sorry. Good Luck.

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We have a 2006 night rod with 6,500 miles on it. The bike when new had a vance n hines fuel pack installed, wide tire kit and the label for fuel pack settings indicates it was done for d&d pipes. The...


im sure the valves and compression are good. as for changing pipes, the computer will adjust for it to a certain point. bringing everything back to stock will probably increase your power. if you want to keep the pipes and fuel pack, i would buy an after market ignition module as well

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