Question about 2000 Harley Davidson FLSTF Fat boy

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The bike peaks at around 90 have problems passing its a bit sluggish want to bump up top end speed and take off speed

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  • dnd_toolbox
    dnd_toolbox May 11, 2010


    Need a little more infomation before rendering a solution...

    Has the bike had any modifcations? Please list them.



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If it's a stock bike, you can change the air breather, carburator, camshafts, and exhaust systems. Lots of High Performanc parts available if legal in your area.

Posted on Sep 24, 2009


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1 Answer

My bike can not pass 85 to 90

Hi, Anonymous and the usual suspects are:
1. Idle speed improperly adjusted.
2. Inlet system air leak.
3. Damaged or restricted fuel tank venting system.
4. Dirty or damaged air cleaner element.
5. The accelerator pump is inoperative.
6. Vacuum piston assembly malfunction.
7. Enrichner valve is not seated or leaking.
8. Restricted fuel supply tract.
9. Plugged bowl vent.
10. Loose or plugged fuel and air jets or passages.
11. Improper fuel level.
12. Worn or damaged needle or needle jet.
13. Loose or plugged main jets or passages.
For more information about your issue please visit the websites below. Good luck and have a nice day.

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What could be wrong?

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good maintnance what you did. but these bikes lacked power in high gear and I used to always have to gear down and pick up more spead. remember that they are a touring bike so you shouldn't even be in 5th at 50mph. try this build enough speed and stay in 4th and don't go up to 5th unless you hit at least 60mph or a bit more. I have an 04 now and guess what, they are all the same you gotta build enough speed before 5th, I toped the 110mph on mine just last week. moral of story, don't treat them like normal cruisers, stay in 3d gear when around town. 4th is just as you get on the freeway and 5th is only for freeway.
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