sneezing shovel
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5th Gear
Joined: Feb 2008
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sneezing shovel
Can someone help with why a shovelhead will "sneeze"? Well that's what it sounds like. It had a Bendix now a Super E. It is a 76. I have a 77 with a Keihin that does the same thing. The 76 has a fit cold but settles out after warming but will sneeze at highway speeds occasionally. This sneeze is through the carb. The 77 is not as bad. I have had other shovels with the same sneeze. I am just curious as I have lived with it. Thanks
Tourer
Joined: Feb 2008
Posts: 269
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From: PA
I had some carb problems on my 76 shovel, that also had a super E, I tried this web site and adjusted it to specs and it's benn great ever since,http://www.millerscustomparts.us/sho...tuningtiPS.HTM...
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Intermediate
Joined: Nov 2008
Posts: 38
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From: Denver
Millers moved the tips but great info there. here is new link.
http://www.millerscustomparts.us/sho...tuningtips.htm
http://www.millerscustomparts.us/sho...tuningtips.htm
Jetting and intake leaks are the #1 cause for the cold symptoms you experience. There is one more factor though. The ignition. If you are running a duel fire (points or the original electronic) overlap of the firing of the cylinders will give you a "sneeze" occationally.
If you aren't running a single fire like a HI-4, I suggest you switch. It makes the motor run so much smoother, and gets rid of the overlap firing. That makes identifying jetting issues much easier.
If you aren't running a single fire like a HI-4, I suggest you switch. It makes the motor run so much smoother, and gets rid of the overlap firing. That makes identifying jetting issues much easier.
Cruiser
Joined: Feb 2009
Posts: 228
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From: Mich
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Banned
Joined: Jul 2008
Posts: 481
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From: Bgosh,WI
I still run the Keihin carbs, back then everybody threw them away and put on S&S because they didn't know what to do, I always want to stay original. Go richer on the idle, mid range and main jets, you will have to play with it several times, seal the plug on top near the Idle mix screw with paint, some had vac leaks there. You can back the timing up a few degrees. If all else fails Andrews makes a #1 cam to fix the originals faults for a stock motor. At the time the factory had to meet tuff emissions and stuff was set lean and timing was advaced to burn clean. My Lowrider runs on the rich side and on a 200 mi ride last year I still got 56 mpg.
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