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Sportster Motorcycle General Discussion and Problems For discussing problems about your Sportster motorcycle that don't fit anywhere else.

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  #31  
Old 4 Weeks Ago
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No idea. The bike is a 2002, I'm the second owner and I'm sure the first owner never pulled the petcock. Chemical anomaly's in the fuel? Something dropped in the tank? Very fine thread like.
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  #32  
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Quote:
Originally Posted by Tomcatt View Post
Take a look at the petcock. I have a huge dislike of vacuum petcocks. Check the vacuum line. Then there's the screen, "filter", that sits over the petcock inlets inside the tank that rarely gets looked at. There's also an issue on older bikes where the owner never runs the fuel down and uses reserve. Then when they do use reserve they pull accumulated crud from the bottom of the tank clogging things. Normal fuel pick-up is thru a standpipe on the petcock and is pulled from an inch or so above the bottom of the tank.
+1 on the vacuum petcocks. I had my '02 start going lean and loosing power right after I got it. The other odd problem was reserve didn't seem to offer any more fuel than the regular setting The vacuum lines on my '02 were replaced a couple years before I got it, and had already started leaking. When I pulled it there was also crud on the petcock screen most of the way to the top. A new petcock without the vacuum feature is pretty cheap, and solves the problem. Replacing the petcock also allows the opportunity to clean all the accumulated crud out of the bottom of the tank.
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  #33  
Old 4 Weeks Ago
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The screen over the petcocks' standpipe is the fuel filter. That's where all the crud hopefully accumulates before it gets to, and clogs, passages in the carb. When you pull the petcock, and you should occasionally, you see crud on the screen that would be hidden if you had an inline filter instead. When there was room I'd toss the screen and run an inline filter between the petcock and carb instead. There you also have to be careful as many of the smaller inline filters are pretty restrictive and you have only gravity feed to the carb.

If you toss the screen, run an inline filter and use reserve regularly (no reason you can't run on reserve after filling up, just remember to switch back) you won't get (or will limit) crud buildup in the bottom of the tank.
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  #34  
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Hate to throw out another "wild goose" to chase but if it's not doing it now that you're home could it be an altitude related misfire?
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