• 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.

running on 3?

  • Thread starter Thread starter steveq
  • Start date Start date
S

steveq

Guest
:confused:gidday guys, i hope you can help as this problem is the only thing left to do.took my 77 gs 550 for a quick spin around the block- definate lack of power on returning home, i noticed that numbers 1,2, and 4 header pipes were hot to the touch, but no. 3 was only warm, also, on removing spark plugs, all had colour except for number 3, the plugs were wet just no colour on number 3. ive cleaned and adjusted the carbys correctly and the bike starts second kick from cold. just seems to be only running on 3. could i have a faulty coil? also, i havent checked the timing yet -could this be part of the problem? thanks regards,steve.
 
steveq said:
:confused:gidday guys, i hope you can help as this problem is the only thing left to do.took my 77 gs 550 for a quick spin around the block- definate lack of power on returning home, i noticed that numbers 1,2, and 4 header pipes were hot to the touch, but no. 3 was only warm, also, on removing spark plugs, all had colour except for number 3, the plugs were wet just no colour on number 3. ive cleaned and adjusted the carbys correctly and the bike starts second kick from cold. just seems to be only running on 3. could i have a faulty coil? also, i havent checked the timing yet -could this be part of the problem? thanks regards,steve.
Click to expand...
Just so we all agree- #1 carb is on left, under clutch hand? Does this bike have a vacuum operated petcock? If so, where is the vacuum hose connected?
A faulty coil would likely show up on two cylinders- timing problem is unlikely, but you could also have misadjusted valves.
 
On your 77, the VM carb vacuum line goes from #3 to the petcock. Is that line attached? Does it have gas in it? Is your crankcase oil level overfilled?

All of the above are signs of a faulty petcock, which can affect cylinder #3


The coil itself is not bad, as it is firing #2, which is on the same coil. The #3 coil wire could be bad. Have you checked for spark on #3? Swap the plugs around and see what happens.

Timing being off shouldn't affect #3, as #2 fires off the same point. However, your timing should always be spot on if you want the motor to last. You do have points?
 
gidday, just went out and lifted the tank to check the vaccum line,although it hasnt been started since last nite, should there not be at least a small amount of petrol residue in the line itself?when i removed the line from the tank and inverted the hose, it was empty-no fuel does this mean fuel tap problems conected to number 3 cylinder?regards, steve
 
steveq said:
gidday, just went out and lifted the tank to check the vaccum line,although it hasnt been started since last nite, should there not be at least a small amount of petrol residue in the line itself?when i removed the line from the tank and inverted the hose, it was empty-no fuel does this mean fuel tap problems conected to number 3 cylinder?regards, steve
Click to expand...
Nope,not a good test, cuz it could all drain to #3 carb as it sat.This is a vacuum line- it should have no fuel in it. Plug the fitting at the carb end and at petcock and take a spin ( dry off #3 plug). But first, remove oil cap and take a whiff- does it smell like petrol? Is oil level higher than usual?
 
steveq said:
gidday, just went out and lifted the tank to check the vaccum line,although it hasnt been started since last nite, should there not be at least a small amount of petrol residue in the line itself?when i removed the line from the tank and inverted the hose, it was empty-no fuel does this mean fuel tap problems conected to number 3 cylinder?regards, steve
Click to expand...

Sorry,mate, but you've got to answer all the questions! :)

Not just one!

Shouldn't take you more than 15 minutes to check all that
 
thanks,i just got home so i started her up and done a plug test -taking the plug cap off numbers 1,2 and 4 the motor wanted to die, when i did the same to no.3 no difference, so started her up and removed cap to no.3, put in a good plug and there is real good spark- so that eliminates that, so i took your advice and checked the oil, only slightly higher,but it definately has a fuel smell im guessing that all this points to a faulty petcock vaccum? i'll remove the tank and test the vaccum by doing the suck/blow test on the vaccum line-is this the correct proceedure? what i dont understand is - why a faulty vaccum only affects number 3 carby and not the rest? kind regards, steve
 
The reason the carb/cylinder with the vacuum line is affected is because there is a diaphragm in the petcock that leaks and the fuel ends up in the vacuum line.
 
You must log in or register to reply here.

Similar threads

P
Starter cranking slowly
Replies
7
Views
148
adam83
adam83
S
Bike randomly died while riding.
2
Replies
28
Views
587
stossboss_gaming_and_news
S
crazyramen
Low Compression in 3 Cylinders 100 Miles After Rebuild
Replies
16
Views
323
rphillips
R
DimitriT
Weak idle until hot
2
Replies
31
Views
691
DimitriT
DimitriT
W
Choke Plunger Replacement
Replies
4
Views
158
Wright 83 GS650
W
Back
Top