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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 12th August 2021
Kramer Kramer is offline
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Default Keihin Butterfly Question

Hello Gents,

I have a 1988 FXR (I know, wrong forum!) with Keihin Butterfly Carb. Trying to get it tuned and found this sub-forum.

Recently put in an Andrews cam. Andrews instructions recommend their “high flow” accelerator pump upgrade for Keihin Butterfly carbs. Unfortunately, this pump is no longer in production.

Hopefully someone on this forum can point me where to obtain one, or perhaps has one they’d be willing to sell.

Also, my research indicates that this is the same pump housing which came standard on Keihin Butterflies prior to 1980.

Thanks,
Kramer
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  #2  
Old 12th August 2021
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Here's a link to the instructions for installing the accelerator pump kit, in xcase it might be helpful...
https://1drv.ms/b/s!Aqi8K9NoC4jihT5m...vAbqI?e=paGVee
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  #3  
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Thanks Mick
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Old 12th August 2021
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Info in the Sportsterpedia.
http://sportsterpedia.com/doku.php/t...ihin_butterfly

Flowmaster carb accelerator pump kit improves throttle response on Keihin carburetor models with a greater volume of fuel from the pump circuit.
Makes since as Andrews used to make the Flowmaster carb.

Vtwin has this one.
https://vtwin.parts/index.php?_route...-9050&limit=50

Woops, sorry Mick.
Didn't check your link to see it's the same as mine.
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Last edited by Hippysmack; 12th August 2021 at 07:35..
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Old 12th August 2021
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Quote:
Originally Posted by Hippysmack View Post
... Woops, sorry Mick.
Didn't check your link to see it's the same as mine.
My link was to just the instruction sheet
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Old 12th August 2021
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Thanks much Hippy. Unfortunately, the VTwin link shows the Flowmaster Kit out of stock.
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Quote:
Originally Posted by Hippysmack View Post
Info in the Sportsterpedia.
http://sportsterpedia.com/doku.php/t...ihin_butterfly

Flowmaster carb accelerator pump kit improves throttle response on Keihin carburetor models with a greater volume of fuel from the pump circuit.
Makes since as Andrews used to make the Flowmaster carb.

Vtwin has this one.
https://vtwin.parts/index.php?_route...-9050&limit=50

Woops, sorry Mick.
Didn't check your link to see it's the same as mine.
Thanks for the Sportsterpedia link! It indicates the Andrews Kit is actually the same as the Harley OEM accelerator pump housing from the mid 1970s. Harley part number 27364-76.

If any of you guys happen to have the early Keihin Butterfly with this housing, I’d like to purchase.

Thanks much!
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