• 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.

Best way to find an air/vacume leak

garyS-NJ

garyS-NJ

Forum Mentor
Over the years, I have tried propane, carb cleaner, brake cleaner, and water. I think the propane worked best.

I have these bst34's on my '90 kat11 and as purchased not running, and after cleaning carbs, the idle is sticking high but sometimes drops down and then it's real low and misfiring. Really seems like an air or vacume leak.

I've posted in the katriders forum without too much love yet.. after the initial carb clean, I cleaned all the plugs (they looked new) and trimmed 2 of the plug wires to get it firing on all four. It pulls hard with the throttle open but I will check compression. It's jetted for a k&n air filter and 4:1 pipe and I moved the fuel mix from 1&7/8 to 2.5. And I tried the stock air filter without changing anything else..

Oh the air leak, I couldntg locate anything with sprays but I changed the intake manifold o-rings and made sure my intake and airbox boots are sealing well. I'm really thinking it's the choke plungers.. but they are actuating nicely and go all the way home.

Oh, locating air/vacume leaks?
 
I have found using a really long piece of fuel hose as a stethoscope works great. Stick one end in your ear and probe around with the other end, I found you can hear some vacuum leaks, this also works for exhaust leaks too.
 
Do you use a vape, e-cig, or whatever the kids call them now? I have always wondered if since they produce a dense cloud of vapor, maybe slowly blowing it around the engine some would reveal an intake leak.
 
Surprised I didn't get more responses here. Maybe if I asked about oil or tires.. anyway, thanks fellas.. I got a few pops spraying carb cleaner near #2 even tho I just changed the intake boots and the clamps seemed tight. But I'm yanking them and found a spare set of intake manifolds gonna Give that a try. This shouldnt be that hard... thanks fellas.
 
Maybe not much love since you covered all the bases already in your initial post. I use carb spray and it was already on your list. Have you checked the screws that plug the holes for syncing the carbs and any vacuum lines for leaks?
 
what did I check?

what did I check?

thanks. there is only one vacume line coming off the carbs for the fuel petock. I have it plugged while tank is off and didn't detect a leak at the other side although its hard to shoot card cleaner down there. for t sync ports they are threaded holes in the carbs and Ive had this problem before and after installing the motion pro tubes

gsrick said:
Maybe not much love since you covered all the bases already in your initial post. I use carb spray and it was already on your list. Have you checked the screws that plug the holes for syncing the carbs and any vacuum lines for leaks?
Click to expand...
 
You must log in or register to reply here.
Back
Top