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Harley Riders USA Forums » Harley Davidson Motorcycle Models » Sportster » 2003 Sportster Carb carb questions

Sportster 883, 883 Custom, 1200 Custom, 883L, 1200L, 1200S, 1200 Roadster and Nightster.

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  • 1 Post By FLHTom1948

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Old 07-20-2018, 09:56 PM Top   #1 (permalink)
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specsphere is infamous around these parts
Default 2003 Sportster Carb carb questions

First off thanks to all the threads on the board for the info i could read and showing me tips on what images to show.

I recently got a 2003 sportster 883 with 3300 miles. The bike only wanted to run when the choke is 100%-50% open but I managed to get that down some with a carb cleaning and some idle tuning but it is still not running right and it has a hiss sound. When still I get on the throttle, I get a hesitation or a backfire from the carb(video in link attached). I looked at the mixture screw and noticed that the previous owner had already pulled the plug and covered the hole with silicone, so someone has tweaked it. I have a few questions about the set up and I am hoping to get some help. I have read through the 600 pages HD resource manual but am not able to find it all my answers. I have attached as many photos as I can think to help with everyone’s input. IF more are needed please let me know,
1) Does anyone know from close what the screw turn out should be? I believe that it is 2.25 turns after the head of the pin has broken the carb hole.
2) The main get is 160, is that enough?
3) The other Jet is 43, is that enough?
4) Any idea what is cause the hesitation?
5) What is the vacuum sound?
6) Some one told me that I have an intake leak, so one of the videos has me covering my intake hole with my thumb so you can se the response. There is another video of what the bike sounds with the choke all the way in, it is the where its barely running.

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Old 07-21-2018, 05:08 AM Top   #2 (permalink)
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We have a member called Carbjoy, his our resident carb expert send him a P.M.
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Old 07-21-2018, 11:25 AM Top   #3 (permalink)
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spray wd40 around carb base and intake manifold joints. If idle speed/quality changes, you may need new seals. check vacuum with gauge, if low there are problems with leaking gaskets/intake seals. Check that intake valves adjustment isn't too tight. Using new spark plugs, accelerate to around 60 mph, cut engine clean, and inspect plugs; should be light tan color. Hesitation can be vacuum or jetting issues -don't forget to check acceleration pump adjustment. Check float level. You do have a manual, right?
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