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Homemade EZ-Just Air/Fuel Mixture Screw for Keihin Butterfly Carb
All,
I've searched high and low for an EZ-Just air/fuel mixture screw for a Keihin butterfly carb. They are available everywhere for the CV, but not the butterfly (although they are advertised at various sites, they have been discontinued and no longer available). I decided to make my own, originally from scratch I later decided to modify one that a member from another board had sent me (THANKS IRONMAN!). I think it came out pretty well though I haven't actually tried it yet. I drilled the original needle about 1/4" deep and turned a piece of brass to fit in the hole. The next part of the shaft that butts against the thread was turned a different diameter (the same size as the slotted top of the needle). Then I knurled the top. I soft soldered the original needle to the knurled portion.
Total price: $5.47 for the OEM needle (I already had the metal).
I've searched high and low for an EZ-Just air/fuel mixture screw for a Keihin butterfly carb. They are available everywhere for the CV, but not the butterfly (although they are advertised at various sites, they have been discontinued and no longer available). I decided to make my own, originally from scratch I later decided to modify one that a member from another board had sent me (THANKS IRONMAN!). I think it came out pretty well though I haven't actually tried it yet. I drilled the original needle about 1/4" deep and turned a piece of brass to fit in the hole. The next part of the shaft that butts against the thread was turned a different diameter (the same size as the slotted top of the needle). Then I knurled the top. I soft soldered the original needle to the knurled portion.
Total price: $5.47 for the OEM needle (I already had the metal).
Dave
Way to go Dave. You always take the Bull by the Horns.
Homemade EZ-Just Air/Fuel Mixture Screw for Keihin Butterfly Carb (followup)
Here's the air/fuel mixture screw installed. I have to use both hands to reach in there to turn it, but it's SOOOO easy. Before I put it on I engraved a reference line on top so that I can count the turns easier. Puts a little more shiny under the tank also.
She's adjusted and ready to go...
Last edited by chengdave2003; Jul 19, 2009 at 08:48 AM.
This is NOT really a under $50.00 because I dicked around so much, buying, machining without any clear ideas-----BUT the light went on and i realized dumping the stock speedo mount and getting an earlier one could be utilized along with a seperate top bar mount----I have attached a picture of my results--I intend moving the mount bolting to under the top clamp as it seem to be subject to vibration as it is now,
I now know that this type of mount can be made using older softail pullbacks and top bar mount.
The point of this exercise was to have the speedo mounted at the stock angle.
A savvy shopper could bring this in under $50.00 or very close.
Last edited by soldierbot; Apr 2, 2021 at 07:46 AM.
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Homemade EZ-Just Air/Fuel Mixture Screw for Keihin Butterfly Carb
