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Rubber Mount Sportster Motorcycle Talk (2004-2006) This area is to discuss issues, problems and anything else unique to the 2004 and above Sportster motorcycles

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air, dies, fuel, power. loss

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  #1  
Old 27th February 2010
pearlblue pearlblue is offline
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Default 2004 883c power loss at 65 mph

VERY frustrating issue - any of you have it?? I have an '04 883C carbureted, and there is an intermittent total loss of power (air? fuel?) when decelerating from 70 to 60...it does not happen all the time.....sometimes the bike DIES altogether! Twenty seconds later it's fine. Scary when in the fast lane. Two dealers unable to solve - any XLForum readers know of/experience this??? THANKS! -pearlblue
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  #2  
Old 27th February 2010
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I have the same bike and I have not heard of that issue. Good luck
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  #3  
Old 27th February 2010
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First thing I'd check is the battery leads. Very common thing for them to be loose and/or corroded and cause all kinds of problems similar to yours.

If you strip the leads off, clean up the contacts, refit but still have the problem then I'd take a look in the carb for gunge floating around the floatbowl or a sticking float. Just give it a good clean-out.
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Old 27th February 2010
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+ 1 on what Foxy says, although one would hope that the 2 dealers you've visited already would have covered most of these options.

If you still can't find any faults I would take a look at your petcock especially if you still have the standard vacuum one. I personally don't like the vacuum petcock and have just changed mine.

I hope this helps,

OR........
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  #5  
Old 27th February 2010
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+2 on battery leads.

DO you have pigtails on for a trickle charger? I had issues with corrosion on their connection to the battery that caused strange problems on the highway. The screws appeared tight, but they were actually welded in because of the sparks the corrosion caused. After that I made sure I clean all connections to the battery with a wire brush and use a battery terminal protectant spray whenever I change my battery.
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Old 27th February 2010
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It sounds like a fuel problem to me. Your main jet may be blocked by a piece of dirt or old gasket material. It can be sucked up and plug things completely, usually under full power and maximum suction, close off fuel and then when you let off of the throttle, with less demand, the foreign object drops down into the float bowl---ready to attack again and cut off your fuel supply!

Check the fuel petcock filter also as they can become dirty too.

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Old 27th February 2010
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Crank position sensor... Spare yourself a lot of scratching around on the carb and check that out first. There is a sticky on this on the forum.
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Old 27th February 2010
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Quote:
Originally Posted by deonc View Post
Crank position sensor... Spare yourself a lot of scratching around on the carb and check that out first. There is a sticky on this on the forum.
Could be. Didn't sound quite like the usual symptoms but
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