S&S Super E questions
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Joined: Oct 2025
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From: TX
S&S Super E questions
1) I occasionally get a POP when starting my bike. I recently adjusted the carb (started at baseline settings and then adjusted per instructional video and seemed well sorted out and it runs great in general). But I get the POP.
2) If I adjust the idle (when warmed up) to be roughly 800-900rpm then it is too low when I start the bike to idle without giving t a tiny bit of throttle. Do I need a larger idle jet?
Thanks
2) If I adjust the idle (when warmed up) to be roughly 800-900rpm then it is too low when I start the bike to idle without giving t a tiny bit of throttle. Do I need a larger idle jet?
Thanks
Last edited by FWR; Dec 23, 2025 at 04:21 PM.
Grand HDF Member
Joined: Sep 2022
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From: Florida
Don’t leave the enricher up a long time. You’ll just start fouling plugs and building up carbon in your chamber. Not to mention “some” small potential of washing your cylinder walls causing piston and cylinder wall wear. Use the enrichner to start it, maybe leave it up 10-15 seconds, but then close it at least half way and fully within 20-25 seconds. If it won’t idle start over tuning your bike. You can have the idle screw at about 900 once warm. No lower.
Usually,,, not always, if your idle mixture screw is more than 1 1/2 full turn out… you will wanna try the next jet up. It might be too much, but usually it’s an indicator of the jet size. If it’s like almost all the way in, try a smaller jet.
Usually,,, not always, if your idle mixture screw is more than 1 1/2 full turn out… you will wanna try the next jet up. It might be too much, but usually it’s an indicator of the jet size. If it’s like almost all the way in, try a smaller jet.
Last edited by Rains2much; Dec 23, 2025 at 06:08 PM.
Cruiser
Joined: Oct 2008
Posts: 143
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From: omaha NE
Dont leave the enricher up a long time. Youll just start fouling plugs and building up carbon in your chamber. Not to mention some small potential of washing your cylinder walls causing piston and cylinder wall wear. Use the enrichner to start it, maybe leave it up 10-15 seconds, but then close it at least half way and fully within 20-25 seconds. If it wont idle start over tuning your bike. You can have the idle screw at about 900 once warm. No lower.
Usually,,, not always, if your idle mixture screw is more than 1 1/2 full turn out you will wanna try the next jet up. It might be too much, but usually its an indicator of the jet size. If its like almost all the way in, try a smaller jet.
Usually,,, not always, if your idle mixture screw is more than 1 1/2 full turn out you will wanna try the next jet up. It might be too much, but usually its an indicator of the jet size. If its like almost all the way in, try a smaller jet.
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Joined: Oct 2025
Posts: 53
Likes: 44
From: TX
Yes, good info. Truth is I haven't been messing much with the enricher, so I will do that. (Still getting acquainted with this old Harley).
So what about the POP on startup? That is even when warm.
So what about the POP on startup? That is even when warm.
Grand HDF Member
Joined: Sep 2022
Posts: 4,476
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From: Florida
Im not there.. kinda tough to diagnose. Im thinking it could be your timing.
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Seasoned HDF Member
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From: Cental, MI
There is an S&S Carb tuning guide ...even available Online!!
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From: Cental, MI
Never heard "weird noises" from my S&S... Mikuni??? There gonna be some Noises... That Slide rattle makes me crazy