• 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.

Jetting issues and pilot screw location?

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

Guest
OK, carbs on , carbs off, rinse and repeat...
trying to dial in my 83 gs1100E with single replacement cone filter in place of the airbox and Yoshimura 4into1, painful experience so far.

At this point, I am running mikuni 130 mains, the stock stock pilots and I have my stock needles shimmed up about 3.5 mm, I have tried to set the air screws ( the ones on top of the outlet side of the carbs, but to max the idle, I have to put them about 3 turns out.

On riding the beast, it kid of stumbles off idle, tehn starts to pull hard at about 3K, but I am getting a lot of popping on decel as well.

On reading other posts (jetting seems to be a popular topic) I have seen mention of air screws and pilot screws, is this something I should be adjusting as well? if so, where is it?

any other suggestions would be gratefully accepted,

TIA
Derrick
 
The screws at the top outlet side of the carbs are the pilot screws. I think people have refered to them as pilot, air or mixture screws.

Did you check the float height? When it pulls at 3k does it pull all the way through the rpm range?

Does it run differently when cold verses it warmed up? Cold being choke off and idling normally, warmed up being well warmed up.

When I was jetting my bike (dynojet kit and individual filters), I would think I had it right and then once it warmed up it would sputter when acceleration off idle and pop on decel. Raising the needles seemed to be the cure. FYI the stock needles are definately fatter than the dynojet needles.

if you could swing buying a kit it may save you some hair :)
 
Hey Pano,
You may be right, when i can swing the cash, a kit may be the ticket. If for nothing else, to get a set of adjustable needles.

I have not noticed a difference between warm and cold, but I have been messing with it for two days and have not really ridden much.

I did not check the float height, but cnce it comes on at 3K, it pulls hard all the way to the redline.

I have tweaked the needles again, I realized (duh) that shimming the needles was not doing any good because the retaining piece sets the max height. I wil test ride in the morning and see how it goes.
Do the jet kits come with new retaining rings or caps that allow the needle to sit higher?


thanks,
Derrick
 
Hard to say how much your intake increases air flow. Not sure what stage jet kit would best match your intake set up either.
On your carbs, you have mixture screws. Turning them out increases the mixture of fuel and air. This is considered richening the mixture. Only the VM carbs have true air screws.
Generally, if your mixture screws have an effect on your "highest rpm" adjustments, and you haven't turned them past 4 turns to achieve that, then you shouldn't need to increase the pilot jet size. But I've seen exceptions.
Shimming seems to create more trouble. I always go with jet kits.
You have to SYNCH the carbs too as an important part of any re-jetting.
 
Do the jet kits come with new retaining rings or caps that allow the needle to sit higher?
Click to expand...

The jet kit will come with a new needle that has a different taper and notches in the needle shaft that accept a circlip which can be moved to either raise or lower the needle height.
 
You must log in or register to reply here.
Back
Top