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  1. #1

    Default Q: S&S super B help / jetting issue ?

    Bike hasn't been run in years. After a few months work, it is about ready to go starts on the first try. The problem is that the choke needs to be on for it to keep running. I've messed around with other settings but not sure if I should break open the carb and see what is going on.

    Thoughts?

  2. #2

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    Btw, it is a 78 ironhead. Here is the build thread...
    First Project Bike is a 78 Ironhead http://www.chopcult.com/forum/showthread.php?t=34708

  3. #3
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    yes. break open the carb and look.

    Maybe your float need adjusted.

    Pull out your jets.....push a pin through them to make sure they arent gummed up. Be sure everything is clean.
    Put it back together and try it out.

  4. #4

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    Your pilot jet is either stopped up or way to small

  5. #5
    ARBY
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    Yep, the idle jet is probably plugged not to mention some of the internal passage ways. My advice would be to pull the bowl cover, remove the jets and the float and soak all the metal stuff. You can soak it in carb cleaner for that purpose or if you don't want to mess with the caustic chemicals you can do this:

    If I have a cruddy carb or one that has been lying dormant for a while I'll soak it for a day or two in a non acid solution of PineSol (household cleaner) and water.

    I cut open a gallon milk jug, fill it with hot tap water, pour in a few ounces of PineSol, drop in the carb parts and let it sit for 24 to 48 hours stirring the solution every now and then. When you take the stuff out brush off the parts under hot running water and it'll all come out looking brand new!

  6. #6

    Default

    Thx, guys. I took the bowl off, leaving the carb attached to the intake. Things looked pretty clean. I blew carb cleaner and air in every passage/hole.

    I took out the idle screw and it was a little crudy. Cleaned it and reinstalled.

    Now I can't get the bike to start at all. Argh!

  7. #7
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    Clean the entire carb real good. Every litle hole, etc......Put FRESH gas in it. If it ran before with the jets in it now, leave it alone.

  8. #8
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    Default

    Quote Originally Posted by Britome View Post
    Thx, guys. I took the bowl off, leaving the carb attached to the intake. Things looked pretty clean. I blew carb cleaner and air in every passage/hole.

    I took out the idle screw and it was a little crudy. Cleaned it and reinstalled.

    Now I can't get the bike to start at all. Argh!
    Turn the idle mixture screw in until it just bottoms out then turn it out about 1 1/2 to 1 3/4 turns, pull the enricher up and, if it's a kicker , give it about three kicks to prime it. DO NOT TOUCH THE THROTTLE!!! if you do you will lose the vacuum and have to start all over. Once it is primed, turn the bike on and kick it to life. If it's and electric start set the carb the same way and hit the button until it is primed and starts. After it starts let it idle for a minute or two then close the enricher. Then adjust the throttle screw to set the idle rpm's.

    Trying to clean the carb without taking it off might have just blown the crap farther into it. I'd take it off and give it a thorough cleaning and then put it back on and try again. B carbs are very simple and really shouldn't give you too much trouble. At least nothing that can't be fairly easily figured out and resolved.

  9. #9
    ARBY
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    Quote Originally Posted by Slosh View Post
    Trying to clean the carb without taking it off might have just blown the crap farther into it.
    What he said.

  10. #10

    Default

    Ok. Guys. Thx. I'll let u know.

  11. #11

    Default

    It could be less than perfect gas. Should it be premium gas?

  12. #12

    Default Q: S&S super B help / jetting issue ?

    I put new premium gas in it and still the same symptoms. Starts immediately but then peters out after 10 seconds. Goes out immediately when letting off the choke. I'm going to thoroughly clean and see if that is the ticket. I'm up for other coaching.

  13. #13
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    Default

    Is your float set correctly? Is your tank vented?

  14. #14

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    Hmmmm. Perhaps not. I don't have a vent on my tank. Just a petcock and the hole to put gas in.

    How do I know if the float is set correctly? Everything is currently soaking in sea foam.

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    If that needle was "a little cruddy" odds are there is enough crud in one of your jets or float valve to make your bike not run.

    I dunno if anyone has said this yet or not, but pull the carb off, check the jets.
    If they're crusty run a piece of wire or something through to scratch that stuff off. Carb cleaner really doesn't do much for that kinda build up.

    I'm just assuming the bike sat for a while and obviously has ethanol gas in it which is bad for....everything.

    PULL THE CARB. Its two bolts.
    Look at it.
    Watch a youtube video about it or something. S&S has a lot of great videos.
    Really it isn't hard.
    If you're still not confident enough to do it then just take it to a professional.
    Last edited by Bandersnatch; 02-21-2014 at 11:47 AM. Reason: not just aluminum

  16. #16
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    Quote Originally Posted by Britome View Post
    Hmmmm. Perhaps not. I don't have a vent on my tank. Just a petcock and the hole to put gas in.

    How do I know if the float is set correctly? Everything is currently soaking in sea foam.
    The vent is in your gas cap. When you take the gas cap off turn it over and you should see a rubber gasket inside of it. Check to see what kind of shape it's in and if there is any kind of build up on the inside of the cap. Soak it in carb cleaner or a similar product to get it clean. Take the gasket out first or the carb cleaner will probably ruin it. Then used compressed air to blow clean and dry it.
    You can run the bike with the gas cap off. If it runs fine with it off and then dies when you put it back on you have found your problem. If you don't want to go through the hassle of cleaning it you can get a new gas cap.

  17. #17

    Default

    Thx for the help, guys. Everything is soaking in sea foam right now. I'll try the scratch test and the cap tomorrow unless I decide to soak longer. A lot of dust at the bottom of the sea foam after only 12hrs

  18. #18

    Default Q: S&S super B help / jetting issue ?

    I soaked for 24 hrs in sea foam and then individually cleaned all parts. Here's what was left behind.

  19. #19

    Default

    Bike will run but not with choke fully off. If I hold it 1/4 open, it runs. A lot more smoke than before. Help!

  20. #20
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    The smoke might just be the residue from the sea foam burning off. We used to pour a little in the carbs of our cars when we were teenagers just to make them smoke. Have you tried adding the sea foam to the gas and running it. Sounds like it still might have some gunk in it or you don't have something adjusted quite right.
    Have you checked for air leaks around the gaskets or at the manifold?

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