• 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.

Carb fuel passage clog?!? Lost power.. ideas

  • Thread starter Thread starter theswedishthing
  • Start date Start date
T

theswedishthing

Guest
Cruising home on the highway last night on my '86 GS400E (canadian model), running like a dream as usual. Get out from behind a truck in a single lane construction area at the start of an uphill onto a big bridge, throttle up a bit, shift up into 5th... nothing there.

Make it over the bridge, then down shift, down shift etc and stall out on the steeper uphill after the bridge. Check for leaks, obvious things wrong etc.. Get it going again and limp home another 15km with a real feeling of underpower and starvation of something.

It will start on choke fine, but not rev up, and will not idle (have to turn the throttle a quarter. The throttle stop is in its usual place; the cable slides well. I haven't taken the carbs apart yet, but am thinking there's something in a fuel passageway or blocking the intake. Any ideas, thoughts?

Cheers
 
Could be the gas tank vent isn't venting. Could also be a chunk of something blocking some carburetor passage someplace, but that would only take out one cylinder. Could be a petcock issue.
 
If it runs/revs on 1/4 throttle but won't idle without choke, what does it sound like when it dies?

Have you tried starting and idling just on PRI?

Can you coax it into idling with the idle screw turned in more (i.e., similar to 1/4 throttle)?

You haven't changed the carbs, but do you have a fuel filter inline? Maybe the filter or other part of the line is clogged and refusing to let in enough fuel to keep the bowls filled. Start with the tank and follow the fuel path like tkent says - tank vent -> petcock -> fuel line and filter (if you have one) -> fuel T connection and pilot fuel jet (though it seems odd that all the pilot jets would crap out at once).
 
I don't have a fuel filter in my lines. I will start with the tank & petcock, I guess. Although it bums me out to take the cock off as you never know what it'll do to the gaskets! Always better to keep things together - unless you have no choice like in this case. :)
Thanks for the suggestions. I'll get back to you with a progress report come Monday-Tuesday.
 
You can check the petcock without ever removing it.
But usually the O ring or gasket is fine to re use.
 
tkent02 said:
You can check the petcock without ever removing it.
But usually the O ring or gasket is fine to re use.
Click to expand...
Yes, but the only way to tell if petcock filter is in good shape,is to remove petcock ; you probably will have to get new two special "sealing washers"- try your hradware store.
 
You must log in or register to reply here.
Back
Top