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  #1  
Old 29th June 2019
brendan brendan is offline
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Default Help identifying which keihin butterfly version I have and necessary jetting

Hi all,


I just bought a 71 900 Sportster and I am trying to identify which keihin butterfly carburetor it came with. When I opened it up it had a size 160 main jet and a size 75 intermediate jet, which in my research does not appear to be a stock configuration in any of the keihin butterfly models.


When I brought it home I had a pretty solid idle but at maybe half throttle in any gear it would just flutter and not make any power until I let off on the throttle again, turns out when I opened it up the main jet wasn't even seated in the threads, it just fell right out. I am thinking the previous owner hardly threaded the 160 main jet on instead of bumping up to a larger correctly sized jet.


I'm just trying to get a baseline on jet sizes to accommodate using this carb on my 71 900 with drag pipes, which is proving to be difficult as I don't know what jets came stock in this particular carb model and how they have already been altered. Any insight would be hugely appreciated.
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Old 29th June 2019
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Here are some photos of the carb - https://imgur.com/a/OZvcuGo
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Old 29th June 2019
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Imagine that, a jetting problem at half throttle with drag pipes!
Drag pipes suck!
This is a proper exhaust.

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Old 29th June 2019
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Quote:
Originally Posted by ryder rick View Post
Imagine that, a jetting problem at half throttle with drag pipes!
Drag pipes suck!
This is a proper exhaust.

Just trying to work with what I've got...
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Old 29th June 2019
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I know of No way to fix it working on the carb. Many have tried.

Work on the exhaust, you can apply band aids but not eliminate the problem.

Stock head pipes and slip on mufflers is pretty good, I think the head pipes with the crossover might be better.
Some drag pipes will accept slip on mufflers but most get tangled up when the second muffler is added.

You might be able to do a stepped pipe with the drags but that is not as effective as a megaphone and has no scavenging effect (which is like free supercharging) a 2:1 will provide.
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Old 29th June 2019
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71 came with a Tillotson carb.
Here is the link to IH carbs and information in the XLFs Sportsterpedia.
http://sportsterpedia.com/doku.php/t...xhaust_systems
Keihin information is on that page also.
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Old 30th June 2019
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Quote:
Originally Posted by brendan View Post
Just trying to work with what I've got...
A lot of us do that.
If your not into racing, or your not anal about impeccable tuning, you can tune the carb close enough to ride around the mid-range stumble. It's yours work on it ride it and enjoy.
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