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  #1 (permalink)  
Old 07-13-2017, 06:12 PM
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S&s super e problems

I have an 80 ci evo that's a case breather (1991 style) with 10:1 compression, and a big can (has double valve springs) running Santee 50 cal pipes (no baffles).

My bike was setup too rich, it fouled plugs about once a year. It had a .0295 intermediate jet, and a .74 main. Even though it it was rich, it would frequently pop in the carburator when I would blip the throttle. I changed the jets to .028 and .72 respectively. Got it dialed in, but when going at highway speed and I let off the throttle it would snap and pop out the pipes, and it would still pop in the carb while stopped, when I blip the throttle. So I pulled the .028 and put the .0295 back in. I have adjusted the A/F mixture from too lean to too rich, and set it half way in between. So now it still snaps and pops at highway speed when I let off the throttle, it's still popping in the carb when I blip the throttle, and it's cold blooded as hell, meaning starts with the choke fine, but a real pain in the ass by just manipulating the throttle while cranking it....... I'm lost, my bike used to run great, except for fouling plugs.

Oh, I'll throw one more thing in here. Before I began this rejecting adventure, I hadn't been riding my bike much (new family) so I rebuilt my carb, in doing so I discovered who ever helped me set it up originally gorilla fisted the A/F screw, so my carb body HAD a crack in it. Go figure, like I said, it ran fine except for fouling plugs. So I bought just the carb body, and rebuilt the carb (round 2) but now I have that new air bleed change that s&s made...... So like I said, I'm lost...... I know tons of you guys are carb guru's (I'm not new, been on here for years, but my old info wouldn't let me log on, so I had to create a new account.)

Thx in advance for the help!!
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  #2 (permalink)  
Old 09-09-2017, 08:30 PM
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Make sure your accelerator pump is working properly ,pipes with no baffles tend to pop. Weak coils or ignition module cause weird shit to happen .
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Old 09-10-2017, 07:47 PM
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Improper air filtration can cause it too, the wrong air filter can cause the same symptoms as turning a screw..or changing a around with your air intake a little.....don't take's a so and so air cleaner and it should work...approach..

2004 Ultima 127 Chopper
1975 Harley Davidson Shovel head Chopper
Shreveport Louisiana

Last edited by Shovel52; 09-10-2017 at 07:50 PM..
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Old 09-11-2017, 07:10 AM
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I've always run S&S carbs, and they always seem to run a little rich, unless you jet them way down. I guess they figure to be better on the safe side for those of us that like to ride hard!

In any event, I've found that if I can make it run and start well from idle, the rest is just fine tuning. These carbs are pretty easy to set up, and have taken a lot of guesswork out of tuning. I have called S&S directly in the past with issues, and they are the best resource for each individual problem. Might be worth a free phone call.

I too was unable to sign in to my old account (rootercycles) and had to create a new one. They're trying to weed out the Riff/Raff I guess...
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