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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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adjustment, idle mixture, ironhead sportster

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  #1  
Old 7th September 2013
nucklhead13 nucklhead13 is offline
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Sportster/Buell Model: 1000 xlch
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Default Idle Mixture Adjustment

My ride is a 1980 thousand CC chopper from a Sportster XL model. After the engine got rebuilt the shop sold me a S@S Super E carb. Now I'm trying to get the right jets and all the adjustments made.
Now it runs nice and smoothly around town around 3500 rpm. It's just that there are times when I let off the gas that it back fires. I put in new spark plugs right after I changed the jets to see if they would fowl. The ones taken out were fowled black. I haven't checked in a couple weeks.
I got stock exhaust pipes after an accident because they were the only ones available. I turned off the acelerator pump before I adjusted the idle mixture just like the manual says. Then I tried to adjust it. Then my ride didn't run real smoothly around town. I went ahead and shut it off again and tried to readjust the idle mixture again.
I think it is getting close, but there are times when the engine just dies when the throttle is let off.
Will that happen with the idle mixture adjusted too rich or too lean?
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  #2  
Old 7th September 2013
Mosey Mosey is offline
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Default

Yo nuck! Hope you enjoy the time ya spend with yer chop. A pic or two of it would sure dress up this thread and give us sumpin' to look at while we're thinkin' about yer problem.

Before ya go any further with the carb, I think you need to check for leaks in the intake and the exhaust. popping on decelleration is commonly a sign of an exhaust leak. There is a lot of info in the Stickies about testing and fixing a leak.

Have you seen this...

http://www.sscycle.com/tech-info/carb-quick-guide/

Let us know what ya find. Good luck.
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  #3  
Old 7th September 2013
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brianbbs67 brianbbs67 is offline
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Sportster/Buell Model: xlch
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Default

What he said and then start at S and S setting for start up and then adjust. That way you're not just stabbing in the dark.
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  #4  
Old 7th September 2013
nucklhead13 nucklhead13 is offline
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Default

Sure, I've been trying to get the right jets for my home elevation. I also have had to learn how to coat thefoam air filter because I haven't been able to find a replacement that is just like the original one. Now I got another thing to check.
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  #5  
Old 7th September 2013
Mosey Mosey is offline
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Default

Try setting yer carb to baseline settings listed in the S&S link I posted and then do a little reading on jetting. It's not hard once ya wrap yer mind around the concepts.

But first check for those leaks - it's free to check and free to fix. Well, almost free! You might hafta buy a beer or soda to make exhaust shims...
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  #6  
Old 8th September 2013
nucklhead13 nucklhead13 is offline
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Default

I've been trying to find the right jets for some time now. I've even kept a log file instead of write notes in some notebook. I ended up picking 26.5 as intermediate jet because the other one I got, 24, is too lean. That jet is used where I get parts, Amarillo Texas and that elevation, 2605 is only 1451 feet lower than mine. The manual says the jets are good at elevations 7000 feet different.
I use a main jet of 66 which is also used down in Amarillo. It passed the hot rod up a hill test.
I can see that learning how to adjust it right is needed. That has made me get an electronic RPM gage so I can follow the instructions in the manual. Once this skill is mastered I'll be able to adjust the carb when needed as the elevation calls for it.
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