S&s super e problems

[Blackiron99]

I'm having problems with my carb. My bike is a bitch to start, warm or cold. It pretty much has to be choked. When running it frequently pops in the carb when I blip the throttle. It's very strong while running down the road, however I'm having a very difficult time adjusting the accelerator pump, seems no matter where it's set, it stumbles when you blip the throttle.... I just can't get it to crack. Also, while at highway speed when I let off the throttle it snaps and pops in the pipes..... So I have a few issues.

[STEINBVG]

Originally Posted by Blackiron99

I'm having problems with my carb. My bike is a bitch to start, warm or cold. It pretty much has to be choked. When running it frequently pops in the carb when I blip the throttle. It's very strong while running down the road, however I'm having a very difficult time adjusting the accelerator pump, seems no matter where it's set, it stumbles when you blip the throttle.... I just can't get it to crack. Also, while at highway speed when I let off the throttle it snaps and pops in the pipes..... So I have a few issues.

You sound lean. Make sure there are no manifold leaks.
What kind of pipes you have? Might be a bitch to do jetting/tunning, especially intermediate circuit if they are short, open and unequal.

[Blackiron99]

I have Santee 50 cal pipes, no baffles. I believe they are 1 3/4, and end at the rear axle.

[Blackiron99]

Oh, and I don't think I have manifold leaks..... My intake gaskets are brand new, and just to make sure they sealed I sprayed wd40 around tgem while it was running, and didn't notice a pickup in rpm's.

[Shovel52]

The popping sounds lean...also the hard starting sounds like starving for fuel...
Maybe you need a good cleaning....Have you tried pumping the throttle while you are on the starter button....? Mine won't crank unless I have gas shooting in,,,,How about if you use starter fluid?with the air cleaner off? Does this make a difference in cranking? you may be looking a t doing a good cleaning..

[Blackiron99]

Originally Posted by Shovel52

The popping sounds lean...also the hard starting sounds like starving for fuel...
Maybe you need a good cleaning....Have you tried pumping the throttle while you are on the starter button....? Mine won't crank unless I have gas shooting in,,,,How about if you use starter fluid?with the air cleaner off? Does this make a difference in cranking? you may be looking a t doing a good cleaning..

The carb was just rebuilt. It has a brand new carb body, so it's clean. So why do you think it's lean? And which one do you think is lean?

[Blackiron99]

Originally Posted by Shovel52

The popping sounds lean...also the hard starting sounds like starving for fuel...
Maybe you need a good cleaning....Have you tried pumping the throttle while you are on the starter button....? Mine won't crank unless I have gas shooting in,,,,How about if you use starter fluid?with the air cleaner off? Does this make a difference in cranking? you may be looking a t doing a good cleaning..

I just rebuilt the carb, and ended up buying a brand new body because my other was broken. So everything is clean. What do you think is making it lean? The main jet, or intermediate?

[Blackiron99]

I just rebuilt my carb, and ended up buying a new carb body because my other was cracked. So everything is clean as can be. What do you think is causing a lean condition? My main, or intermediate jet?

[Blackiron99]

Originally Posted by Shovel52

The popping sounds lean...also the hard starting sounds like starving for fuel...
Maybe you need a good cleaning....Have you tried pumping the throttle while you are on the starter button....? Mine won't crank unless I have gas shooting in,,,,How about if you use starter fluid?with the air cleaner off? Does this make a difference in cranking? you may be looking a t doing a good cleaning..

My carb is clean, fresh rebuild, and brand new carb body (original body HAD a crack at the A/F mixture hole. What do you suspect is causing the lean? The main jet, or intermediate. And why am I unable to find any sweet spot on the accelerator pump setting?

[Captain America]

If it's popping out of the carb it's lean, out the pipes is rich, the condition of your plugs will tell you quite a bit also. When you twist the throttle are you getting a good pump shot that you can see? If you're accelerator pump well is clogged from dirt or not full because of an incorrect float setting you won't have much of a pump shot. That being said, what engine do you have and what ignition system are you using?

[Blackiron99]

Originally Posted by Captain America

If it's popping out of the carb it's lean, out the pipes is rich, the condition of your plugs will tell you quite a bit also. When you twist the throttle are you getting a good pump shot that you can see? If you're accelerator pump well is clogged from dirt or not full because of an incorrect float setting you won't have much of a pump shot. That being said, what engine do you have and what ignition system are you using?

Ok, I have popping in the exhaust at highway speed only when I left off the throttle. I have pop in the carb when sitting at idle and I blip the throttle. S&S tech says I need to increase the main jet. And make sure I don't have a manifold leak. My manifold gaskets are brand new, and I sprayed wd40 on the while the bike was running. I didn't observe any pickup in rpm's.... still stumped.... especially since the jet combo the tech is suggesting foweled plugs before...

[STEINBVG]

Granted, you do not have manifold leak[ i'm not sure wd40 is reliable, i pressure tested the integrity of manifold while spraying flanges with soapy water]

Overall It sounds like you might be lean on intermediate jet[thus hard starting, needing choke and popping when try to open the throttle] and perhaps rich on main[ thus, when you let go off throttle, the engine compression still sucks gas in, throws it through straight wide exhaust[not the best for tuning] where it continues to burn and pop.

You actually have to shut off the acc. pump to do the jetting correctly- initially intermediate, then main.

[Shovel52]

From what I read, usually a lean mixture causes more of a thunk in the exhaust pipes than a pop. the pipes are running hot and igniting the gas that is not completely burnt up..Popping means rich in the pipes..So that is a little confusing........Don't forget the air cleaner also.....too thin of an element or velocity stacks , cones,etc...can cause lean.....Tape off part of your air cleaner and
en richen it up slightly ...take it for a ride..

[Blackiron99]

Originally Posted by Shovel52

From what I read, usually a lean mixture causes more of a thunk in the exhaust pipes than a pop. the pipes are running hot and igniting the gas that is not completely burnt up..Popping means rich in the pipes..So that is a little confusing........Don't forget the air cleaner also.....too thin of an element or velocity stacks , cones,etc...can cause lean.....Tape off part of your air cleaner and
en richen it up slightly ...take it for a ride..

I have the s&s tear drop, with k&n filter.

[STEINBVG]