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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 16th April 2012
marktm200 marktm200 is offline
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Default newb carb help

Hello everyone, so i bought my first sportster its a 03 1200 the other day the previous owner hasnt ridden it over the last 2 years. i bought it off him knowing it would only run on half choke and that the carb would need to be cleaned. I took the carb apart like i have done before to japanese bikes and cleaned the ports and replaced the intake gaskets as a friend recomended i do at the same time. It ran much better but not great. It has a 180main and 45pilot jet with vance and hines pipes and screaming eagle air cleaner. My problem is it seem so be running lean "popping" on deceleration hesitating every once and a while and the carb farts a lot. I have the air screw out 3 and 1/2 half turns and stopped. when i cleaned it i noticed there was not a spring on the air screw i plan on ordering a cvp spring kit but could this be my problem? should i go up to a 48 pilot it seem like alot thanks for you help
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  #2  
Old 16th April 2012
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PiousDevil PiousDevil is offline
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check for intake leaks? Diaphragm look ok? I dunno, order a new 42mm mikuni and breath some life into that thing.
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  #3  
Old 16th April 2012
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that spring can stick up in there, btw, did you actually take the carb off and get a good look in there?

Last edited by PiousDevil; 16th April 2012 at 00:33.. Reason: spring, not screw. spring!
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  #4  
Old 16th April 2012
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cowboy770 cowboy770 is offline
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First welcome to the forum. The 45 should be fine. I would change the main to a 175. That's what I would try
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Old 16th April 2012
marktm200 marktm200 is offline
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thanks everyone, I took the carb off of the bike twice now. the previous owner said it ran good with the 180 main and 45 pilot. I sprayed wd40 over the intake/head area and it did not change rpm to i dont think its the intake and the diaphram looked ok to me. I was on the cvp website and i was thinking about ordering one of there deluxe tuners kits and start over with there recomended jet sizes, are they any good? Also i took the plugs out of it and they were really gray they looked like they had been in there for some time could it have been like this for a while now? any ideas appreciated
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Old 16th April 2012
semjpm semjpm is offline
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Air screw needs a spring and an o-ring.

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Old 16th April 2012
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Quote:
Originally Posted by semjpm View Post
Air screw needs a spring and an o-ring.

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  #8  
Old 16th April 2012
marktm200 marktm200 is offline
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I just ordered a cvp kit with the replacement o ring and spring i'll have to see what it does when it comes in
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