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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 30th October 2016
ElJeffe ElJeffe is offline
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Default Rejetting and throttle position.

Hey guys, new sportster owner here. Need a little help.
04 sportster 1200 #48 pilot and #175 main.
K&N filter and air box mod, drag pipes
The bike takes a while to get to where I can run without the choke even in 85 degree weather. Looked at plugs and they are blackened. I ordered at 46 pilot and a 180 main and plan on retunning. The question I have is about the butterfly position. I've looked all over and can't find anything about it. The way I got it the butterfly was open about the thickness of a credit card maybe a little more. Where do I need to set the position to start tuning? What is the stock position as far as screw turns go? Any thoughts or suggestions on jets are also welcome.
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  #2  
Old 30th October 2016
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The throttle plate should be fully closed with the throttle closed, and should open fully.

Have you read the threads in the Carb: Tuning, Jetting, How To Sticky Index ?

I suggest that you start with this one:
Read this First - Jetting 101
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  #3  
Old 30th October 2016
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Here's the Sportsterpedia section regarding preparing for tuning the carb:
http://sportsterpedia.com/doku.php/h...ur_information

That section flows into the section regarding setting everything else up correctly before actually tuning the carb so that your tuning effort is effective...

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Old 30th October 2016
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IXL2Relax, that got me fixed up. Apparently it needs to be between the idle port and transfer ports to start with. Thanks!
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Old 31st October 2016
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Quote:
Originally Posted by ElJeffe View Post
IXL2Relax, that got me fixed up. Apparently it needs to be between the idle port and transfer ports to start with. Thanks!
That's the target location - You don't want the transfer ports feeding fuel and overwhelming the idle setting... You want the transfer ports to feed in 'during the transfer from idle to throttle'...

But do pay attention to the other parts of the system - fuel lines, vacuum lines, linkage, etc. - They can have an affect on the quality of your tune...

Good Luck - Post up again with further questions/problems - Someone on here probably has seen every issue at least once...

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