• 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.

What is up with vacuum?

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

Anonymous

Guest
I have noticed my bike runs great without the the vacuum tube(on carb three) plugged, in other words,open to vac the outside air. When plugged the exhaust pops and the number two carb backfires. I installed a K&N airfilter and have been told that could cause the carb backfire(I'm currently checking into that), I have found no leaks in the exhaust, however I could be looking in the wrong places.
Why would the bike run better without the vac line plugged and how does one check the exhaust for leaks?
 
Not sure what you are talking about here. I have a 1000 and the input between #2 and #3 is the fuel line input with the 5/8" nipple. My vacuum line is above that coming off #3 carb. Could you have those hoses switched? One vacuum line goes back to the petcock to pull the diaphragm open to allow fuel into the carbs only when the engine is running. the other two vacuum lines should have long rubber hoses on them and can just drop down behind the engine since they are not used.
 
If the hoses are hooked up correctly, and bike runs without vacuum tube hooked up, then your vacuum-operated petcock (assuming that is what you still have on the bike) is shot.

(Unless you're running it in the PRIME position)
 
The vac line runs from the #3 carb while the other hoses are routed up and around the back of the airbox. The diaphram of the petcock is non-functional(a rebuild kit is on the way) so when I bought the bike it was not hooked up, just hanging. Another member said I should plug the vac hose so I did and all heck broke loose!(see above!). When I UNplugged the hose all returned to normal and it rides just fine. I just completed about 5 laps around the neighborhood without any pops, backfires, and without the bike running way too hot, something else it was doing with the hose plugged. When hooked up to the petcock is the hose completely "plugged" or does it take in "some" air? It certainly does NOT like being completely stopped up! 8O
 
kevin mannion said:
The vac line runs from the #3 carb while the other hoses are routed up and around the back of the airbox. The diaphram of the petcock is non-functional(a rebuild kit is on the way) so when I bought the bike it was not hooked up, just hanging. Another member said I should plug the vac hose so I did and all heck broke loose!(see above!). When I UNplugged the hose all returned to normal and it rides just fine. I just completed about 5 laps around the neighborhood without any pops, backfires, and without the bike running way too hot, something else it was doing with the hose plugged. When hooked up to the petcock is the hose completely "plugged" or does it take in "some" air? It certainly does NOT like being completely stopped up! 8O
Click to expand...

Not sure, but if you were told to disconnect and plug the vacuum line, then you were probably also told to switch the petrooster to Prime. If not then this would explain the erractic running and overheating condition...
Bike would be starving for fuel...extreme lean condition.
 
You must log in or register to reply here.
Back
Top