• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

1980 GS850 with BST36SS carbs pilot jet tuning

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Guest
I noticed recently that my GS850 is running a bit lean in the pilot circuit. It is running BST36SS carbs with Uni filters and a baffled 4 into 1. The main and needle circuits are perfect but Im getting some popping on deceleration that is more noticeable at night when the ambient temperatures go down as well as some very slight bogging. the fuel mix screw is turned 3 turns out already so its time to either go down 1 air jet size or up one pilot jet size. Im leaning towards going down one air jet size to keep the amount of fuel waste as little as possible. Is this the way to go or should I switch the pilot jets instead?

Thanks
Matt
 
BST36SS's are very large carbs for a 850, has the bike got some internal mods done or is it stock?
 
As far as I know it's stock. It seems to work really well though.
 
Right. I meant internally it seems stock although I didnt pull the head to check the size of the bore in the cylinders.. When I did the valve clearances the cams appeared stock. The carbs do work well with the bike and it doesn't feel overcarbed at all. Should I downjet the air jet or upjet the pilot jet to compensate for the lean condition on the pilot circuit?
 
Can you post pics of the carbs ? What intake pipes do you have on the bike? Not sure 36's would fit stock the intake pipes.
 
go up 1 step on the pilot still may not stop the decal lean misfire. might take 2 steps - and a clip level adjustment on your needle. -- what is in there? 45 or 47.5?
 
trippivot said:
go up 1 step on the pilot still may not stop the decal lean misfire. might take 2 steps - and a clip level adjustment on your needle. -- what is in there? 45 or 47.5?
Click to expand...

I think those sizes are stock 1100 pilots...
 
You must log in or register to reply here.
Back
Top