keihin spit and sputter
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Mine is behaving pretty much the same, but sounds like yours is worse. If you have a bad intake manifold, gaskets, etc. and you are sucking air after the carb, then you will have a lean mix and it will pop on decel. If you are coughing through the carb, same issue, BUT it could be a jetting problem. If you want to keep the orignal Keihin, what you can do is rejet both the low speed and high speed jet and it will help. Use a .88 for the low speed and a .180 for the high speed jet. You can buy these at J&P Cycle Parts. VERY cheap. This will help, BUT it will never run great until you replace it with a better carb. You should also look at your pipes. Have they been replaced? If you are running drag pipes, that will change how your engine breathes and runs too and you will have to rejet accordingly. Valves OK? You should have at least 90PSI in each jug for compression. Less than that and you may have valve and/or ring problems.
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I call that a Government cough! Seems like since they started choking our bikes this has been the result. The Keihin on my '78 FXE started doing that not very long after I got it. Nothing I did would stop it for very long. I finally put an S&S Super E on it and never looked back. Keihin is now a parts part.
I had a Bendex on my '52 Pan/Shov. and it was a good carb except for a hesitation burp at low speed when turning, like a u turn. May have been low float, but I never investigated.
I had a Bendex on my '52 Pan/Shov. and it was a good carb except for a hesitation burp at low speed when turning, like a u turn. May have been low float, but I never investigated.
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Those old Keihins could be made to run very nicely with a little work and a few new parts . Harley started capping the mixture screw boss so you had to drill that and open her a couple turns . A new main jet tube or re do yours if you have the itty bitty jet drills that rare now , add the andrews bigger volume accel pump & re aim the jet so itshot about a 15 deg off center to the front and those behaved very well @ 45 to 50 mpg on stock motors . My S&S 's never got over 40 on a good day .
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Those old Keihins could be made to run very nicely with a little work and a few new parts . Harley started capping the mixture screw boss so you had to drill that and open her a couple turns . A new main jet tube or re do yours if you have the itty bitty jet drills that rare now , add the andrews bigger volume accel pump & re aim the jet so itshot about a 15 deg off center to the front and those behaved very well @ 45 to 50 mpg on stock motors . My S&S 's never got over 40 on a good day .
Like TwiZted said, I'm proof. Very very few coughs. And starts fine. runs smooth, idles low when Cold. But on an FLHTC I get 40 mpg tops. Before I rebuilt this carb it ran like yours. We have E10 so a rebuild was needed for an aged ride. but always look for intake leaks.... I have compliance intakes so I would check there first.