86 Keihin Butterfly Carb question
#1
86 Keihin Butterfly Carb question
Hi.. I've posted here before on my hesitation issue. What I'm looking for help on before I take this carb apart /clean, get pissed and spend money on aftermarket lol.. Is this the Accelerator pump screw? Wondering if I adjust this like the SS I can get my hesitation resolved from idle. Tighten all the way, and start backing out until I have good throttle response. This is not my actual carb, just a pic I stole of what my carb is. I changed the pump diaphragm as I started to notice this hesitation, also notice when I would twist throttle, gas would come out of the boot. That is now resolved, but still have my hesitation at idle. I'm thinking just an adjustment? but I'm not familiar with these carbs. Don't want to start messing with the screws , not knowing what they are. Sorry.. Thank you in advance.
#2
This is the Accelerator pump...and yes...you should adjust just like an S&S... Which means,..the accelerator pump should be Off...for adjustment...
that is... the accelerator pump is the very Last thing you put into play [adjust]
If you are Not going to do it the correct way... you cannot expect any worthwhile results!!!
In general... those ka-sneeze carbs come from the MoCo set very lean...in order to be EPA compliant..so jetting is Required... ie No amount of "squirting" is gonna help anything!!!
that is... the accelerator pump is the very Last thing you put into play [adjust]
If you are Not going to do it the correct way... you cannot expect any worthwhile results!!!
In general... those ka-sneeze carbs come from the MoCo set very lean...in order to be EPA compliant..so jetting is Required... ie No amount of "squirting" is gonna help anything!!!
#3
This is the Accelerator pump...and yes...you should adjust just like an S&S... Which means,..the accelerator pump should be Off...for adjustment...
that is... the accelerator pump is the very Last thing you put into play [adjust]
If you are Not going to do it the correct way... you cannot expect any worthwhile results!!!
In general... those ka-sneeze carbs come from the MoCo set very lean...in order to be EPA compliant..so jetting is Required... ie No amount of "squirting" is gonna help anything!!!
that is... the accelerator pump is the very Last thing you put into play [adjust]
If you are Not going to do it the correct way... you cannot expect any worthwhile results!!!
In general... those ka-sneeze carbs come from the MoCo set very lean...in order to be EPA compliant..so jetting is Required... ie No amount of "squirting" is gonna help anything!!!
#4
Thanks .. As I mentioned, I didn't do anything but replace the diaphragm in the carb AP . However , after I fixed that, didn't cause hesitation to go away, but gas stopped seeping out of the AP boot. So I'm wondering ( I bought bike this summer) if the adjustment is out of wack on the AP screw since the diaphragm is now fixed. I'll give it a shot before I put SS on it. Maybe prolong this carb another year or 2. ha ha
#6
Thank you Sir. This step I've done. All good. No leaks. If I end up taking carb off, I'll replace all that when I put back together. I'm thinking/hoping , I just need to adjust AP screw. Obviously will be awhile since Ohio is cold now. lol
#7
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#8
After using the AP [Band Aid] and the lean from the Factory jets... I forsee yet another Keihin butterfly carb an the Market!!!!
May as well save some time and Buy, then learn to tune, something else!!!!!!
#9
Hi.. I've posted here before on my hesitation issue. What I'm looking for help on before I take this carb apart /clean, get pissed and spend money on aftermarket lol.. Is this the Accelerator pump screw? Wondering if I adjust this like the SS I can get my hesitation resolved from idle. Tighten all the way, and start backing out until I have good throttle response. This is not my actual carb, just a pic I stole of what my carb is. I changed the pump diaphragm as I started to notice this hesitation, also notice when I would twist throttle, gas would come out of the boot. That is now resolved, but still have my hesitation at idle. I'm thinking just an adjustment? but I'm not familiar with these carbs. Don't want to start messing with the screws , not knowing what they are. Sorry.. Thank you in advance.
I put an andrews accelerator pump kit on mine and it made noticible difference. They dont call these carbs a ka-sneeze for nothing!
#10
I never knew that the pump rod was not adjustable on the Keihin carb. Interesting... I'm currently running 42 HSR on a stroker Evo and the accelerator pump is disconnected but I've never had an issue with sneezing or coughing. The signal must be quite strong to be able to pull the fuel up without hesitation.. May be the reason it's so popular... But I still like my S&S carbs..
Last edited by 98hotrodfatboy; 11-18-2019 at 08:23 AM.