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  #1 (permalink)  
Old 05-13-2018, 11:14 AM
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Super E stumbling at about 4000 rpm

I just changed the air filter on my AIH Texas chop to a cone filter.
The bike also has a short 2-1 exhaust with torque cones.
The carb is a Super E. Engine is an S&S 111.

Took it for a first test right after the AF change. In a moderately hard acceleration
the bike bogs down at between 3500 and 4000 rpm. If I wack the throttle wide open while it's bogging it will come back on and continue to accelerate.

I'm thinking that the intermediate jet could be the culprit and that I need to go up a size.

Any advice would be really great!
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  #2 (permalink)  
Old 05-13-2018, 12:28 PM
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Quote:
Originally Posted by chuck1073 View Post
I just changed the air filter on my AIH Texas chop to a cone filter.
The bike also has a short 2-1 exhaust with torque cones.
The carb is a Super E. Engine is an S&S 111.

Took it for a first test right after the AF change. In a moderately hard acceleration
the bike bogs down at between 3500 and 4000 rpm. If I wack the throttle wide open while it's bogging it will come back on and continue to accelerate.

I'm thinking that the intermediate jet could be the culprit and that I need to go up a size.

Any advice would be really great!
How did it run with the original filter?
If the the new filter is less restrictive - you may have leaner condition for either jet. You will need to do the proper jetting.
The rpm above 3k is tipically the main jet realm. Lean condition manifests by higher temp, explosiveness- pops through carb. Rich- more sluggish , fouls plugs, poor economy, at times pops to pipes on deceleration - the unburned gas.

Wacking the throttle may I engage the acc pump spray and overcome lean condition faking recovery.
To correctly jet, I would shut off the acc. Pump completely. You can ride bike without it and it should smoothly idle, accelerate through all the rpm with regular twist of a throttle . Aftter it,s all done, you open acc pump back to minimum to have a crisp wack without smoke coming out of the pipes.
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  #3 (permalink)  
Old 05-13-2018, 12:49 PM
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Thanks Vitaly. It ran fine with the original filter. That was the stock AIH unit...about the same size filter as an S&S teardrop. The new filter is the cone type. May actually a bit smaller in filter area.
To turn the acc pump off, do you turn the screw fully CCW? I could try that and see how the bike accelerates. Looking at the plugs right now, I'm on the lean side. Center electrode is white and the ground electrode is light grey.
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Old 05-13-2018, 01:55 PM
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Quote:
Originally Posted by chuck1073 View Post
Thanks Vitaly. It ran fine with the original filter. That was the stock AIH unit...about the same size filter as an S&S teardrop. The new filter is the cone type. May actually a bit smaller in filter area.
To turn the acc pump off, do you turn the screw fully CCW? I could try that and see how the bike accelerates. Looking at the plugs right now, I'm on the lean side. Center electrode is white and the ground electrode is light grey.
Here,s good article and video about the adjustments.

https://www.sscycle.com/tech-info/in...rb-quick-guide

One thing I would do differently is keep acc. Pump closed(CW) till I,m completely done with jetting of both jets. If it,s operational, it may interfere with jetting.
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SORRY FOR THE UPPER CASE. I AIN'T YELLING. I JUST MAKE TOO MANY TYPOS IN THE LOWER.

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Old 05-13-2018, 07:30 PM
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Some of the cone filters will not pass enough air for a big cube motor. Thats why HD came out with the larger SE Heavy Breather filter. Also if you filter has a cover try running it with it removed. You cam most likely make it better with tuning but you are masking the problem.....It will make more power if it can get more air.
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Old 05-13-2018, 08:28 PM
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It's the cone..I went through that, and also helped someone here that ran into the same problem..You will have to partially block off some air intake..I used a home made gasket with the hole cut to proper size..you will have to experiment...He ended up shoving a partial tennis ball into his cone and fixed his.. he had a double cone..Mine still never ran as good as the stock air filter... It also has to do with the type of paper they use..
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  #7 (permalink)  
Old 05-15-2018, 04:29 AM
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Pushrod243, it does looks like I'm getting enough air. I removed the filter element and cover and still got the same result. I have a feeling it's just running really lean. I have an old friend who's a long-time v-twin tech. Once he's in the shop today I'll get his read on the situation.
Thanks everybody for contributing!
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Old 05-15-2018, 02:17 PM
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I ran a similar filter on my BBC. I found that it was getting too much air, it was like a Venturi effect. I put in a small round screen with rubber around the edges. No more problems after that.

If its getting too much air, you need to increase the fuel. Bigger jets. Also, isnt the E carb for 100" motors and smaller.
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Old 05-16-2018, 05:04 AM
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Hey Golfish. My misquote. It is a G.
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  #10 (permalink)  
Old 05-18-2018, 12:07 AM
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Quote:
Originally Posted by chuck1073 View Post
Hey Golfish. My misquote. It is a G.
Good deal. Can you change the angle of the dangle? I assume you have the cone pointing straight? Try pointing it up or to the back. See if that helps.

What size jets are you using?
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Old 05-18-2018, 01:24 PM
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I might be able to rotate the cone to vertical. Tomorrow's gonna be rainy so, that's a quick project. I have re-jetted. The largest intermediate jet in the kit was .033. That's really minimized the small stumble going from the intermediate to main jet. I've got an .036 coming. I have a feeling that may solve the problem completely. Right now, with the accelerator pump off, it just lags a little bit. With the pump on, about 1 1/2 turns, it's even better.
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Old 05-18-2018, 03:21 PM
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I don't know if this would help you, and I don't know if you can get them on your side of the pond.
I've used this in the past on Jap 4 & Brit twins and it's helped me no end.

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  #13 (permalink)  
Old 05-20-2018, 09:12 PM
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I might not of explained my issue very well. My bike would stumble at speeds higher than say 30 mph. Its was just getting too much air. If I turned the cone pointing up it was all right. I just didnt like it pointing up. When I installed the screen , it would break up the venturi effect.

OPs problem sounds more like a jetting issue.
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Old 05-21-2018, 02:39 PM
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Problem solved. Ended up going to a .036 intermediate jet. It now pulls smoothly all the way up. Like a freakin' tractor!
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