Super E hiccup while coasting
Thread Starter
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Cruiser
Joined: Jun 2015
Posts: 104
Likes: 2
From: Olympia, WA
Super E hiccup while coasting
'75 FX with 80" kit, 3 5/8" bore. I have an older Super E installed (without a main jet air bleed, just the hole), and an aftermarket air cleaner. I've been through the carb guide repeatedly, and have got it very close after bumping the intermediate jet to .031 (it was hiccuping on throttle at low speed constantly.
Now it is only hiccuping when I am coasting or changing gear. As I roll on throttle and release clutch it wants to cough, sometimes hard enough to kill the motor.
I can't imagine the current jet sizing being to small at this point. Could this be a problem with the accelerator pump assembly? It is all pretty new (rebuild kit put on by shop last summer.)
I've followed the letter of the carb guide, and have gotten it almost there, even removing the bowl vent plug due to the different air cleaner. Thanks for any advice.
Now it is only hiccuping when I am coasting or changing gear. As I roll on throttle and release clutch it wants to cough, sometimes hard enough to kill the motor.
I can't imagine the current jet sizing being to small at this point. Could this be a problem with the accelerator pump assembly? It is all pretty new (rebuild kit put on by shop last summer.)
I've followed the letter of the carb guide, and have gotten it almost there, even removing the bowl vent plug due to the different air cleaner. Thanks for any advice.
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,625
Likes: 3,388
From: Cental, MI
My Concern revolves around
"and an aftermarket air cleaner"
Difficult to improve on the S&S air cleaner...and If you are Not using a K&N filter in any air cleaner.. Good luck...I can't help.
Thread Starter
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Cruiser
Joined: Jun 2015
Posts: 104
Likes: 2
From: Olympia, WA
As for the air cleaner it is one of those V-twin sandwich style with th perforated sides. Foam filter. Thanks
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,146
Likes: 7,659
From: Poolville
Sorry should've asked how long have you owned the bike and what changes you made.. For the air bleed you mean that there is no jet in there? And that the casting of the carb body is wide open?
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,625
Likes: 3,388
From: Cental, MI
The Early S&S had just a hole... on those we drill and tap for the replaceable air bleed "Jet"..Unless it simply comes into it, and you do Not intend a ThunderJet...which is where the Replaceable air bleed "jet" came from in the first place
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Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
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From: la la land jerzey
go after the intake first a 31 is a big jet for that size motor and using a stock cam - that could be part of the problem but intake air leak is on the page to do - it has o rings they are always suspect in tuning out issues
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Stellar HDF Member
Joined: Apr 2007
Posts: 3,008
Likes: 464
I learned the hard way, and "fixed" everything imaginable until I discovered the leak and sealed it.
My bike ran like crap, and fouled plugs like crazy, until I cured the intake leak.
Tourer
Joined: Apr 2009
Posts: 307
Likes: 108
Ditto on intake leaks. Carb braces are mandatory and the stouter the better. I and many others use "aircraft" style manifold clamps.
Those sandwich style air filters with the perforated wraparound are quite restrictive. I'd install the correct S&S air cleaner assembly ASAP.
Those sandwich style air filters with the perforated wraparound are quite restrictive. I'd install the correct S&S air cleaner assembly ASAP.