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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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View Poll Results: What jets do you typically use? Choose all that apply.
#42 slow 80 10.51%
#45 slow 483 63.47%
#48 slow 126 16.56%
#165 main 31 4.07%
#170 main 110 14.45%
#175 main 158 20.76%
#180 main 226 29.70%
#185 main 93 12.22%
#190 main 62 8.15%
Yes my needle is shimmed 146 19.19%
No my needle is not shimmed 237 31.14%
Other, explain. 81 10.64%
Multiple Choice Poll. Voters: 761. You may not vote on this poll

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  #231  
Old 31st May 2017
gpydeski gpydeski is offline
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My 45/180 is on my 1200 Shovel with two into one with a great sounding aftermarket muffler. I have a question though. What are the purpose of the shims under the needle?
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  #232  
Old 31st May 2017
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Putting a shim under the needle raises the needle, and, in effect, changes its length. Once the needle starts to rise, it brings the taper in sooner, and at any particular point while the taper is in play, it make the mixture richer. As you can no doubt imagine, the changes are very small. This is very much about fine tuning.
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  #233  
Old 18th August 2017
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'06 1200
no name slip-on drags
stock AC w/ HD filter
CVP kit
extended screws
45 pilot, 180 main


having trouble with maintaining even throttle, engine power. seems like it was to burb, hiccup, chug, missfire in gears 1-3 @ speeds of 0-35mph.

first time tuning a carb and i just can't figure it out. i understand the basics and have read all the links.... not sure what i am experiencing and don't know what to exactly call it to find help resolving.
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  #234  
Old 19th August 2017
CVPerformance CVPerformance is offline
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Your jetting sounds fine and the conditions described are more likely the result of a vacuum leak (most common) or perhaps the need to adjust your mixture screw. If you have the CVP kit that comes with the EZ-Just then the below link talks about adjusting that mixture to find the sweet spot in the transition between idle and mid range.

Mixture Screw Adjustment

It cannot be emphasized enough that vacuum leaks can really throw things off. Having said that, here are some of the other common problems encountered before or after rebuilding a CV carburetor:

https://cv-performance.com/harley-cv-carburetor-tuning-issues
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  #235  
Old 31st August 2017
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42, and 160, screw ~3 turns out. I am not sure, but I may be a little lean, once in a while i get a slight cough at the carb. Normal?
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  #236  
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2002 1200S
Kerker 2 into 1
Air Hammer Impact
200 MJ
46 PJ
NOKK Needle
No shims
2.5 turns out- mixture screw
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  #237  
Old 1st September 2017
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Quote:
Originally Posted by frankjc View Post
42, and 160, screw ~3 turns out. I am not sure, but I may be a little lean, once in a while i get a slight cough at the carb. Normal?
I wouldn't try to drown out a "once in a while slight cough at the carb" with too much fuel if your mixture is otherwise correct and your bike runs well. Your jetting/settings don't sound far off for an 883 with a decent exhaust rather than drag oipes.
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  #238  
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Quote:
Originally Posted by Don Burton View Post
I wouldn't try to drown out a "once in a while slight cough at the carb" with too much fuel if your mixture is otherwise correct and your bike runs well. Your jetting/settings don't sound far off for an 883 with a decent exhaust rather than drag oipes.
+1

Nice to hear from you again Dan.
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  #239  
Old 1st September 2017
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Quote:
Originally Posted by Don Burton View Post
I wouldn't try to drown out a "once in a while slight cough at the carb" with too much fuel if your mixture is otherwise correct and your bike runs well. Your jetting/settings don't sound far off for an 883 with a decent exhaust rather than drag oipes.
I think I am going to leave as it is for now, thank you.
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  #240  
Old 1st September 2017
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When I bought my bike, a 97 1200, it had drag pipes, stock air set up and stock jetting 42/170. I switched the pilot jet to a 45, which made it run better but it still had a decel pop.
I just put on Samson 2 into1 pipes and it ran horrible, no power, popped like crazy, so this morning I switched back to a 42 slow. The decel pop is still there, but huge improvement in performance.
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