• 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.

80 GS750L keeps dropping Cylinder #2..... No clue why

  • Thread starter Thread starter NatiKiD
  • Start date Start date
N

NatiKiD

Guest
I have a 1980 GS750L that was sitting for some time. Well in the last 6 months I have brought it back to life. This issue started a few weeks ago. I just was out riding the back roads of Ohio... and the bike starting loosing power.. Would barely accelerate and would stall every time I would stop. Got home and the valve cover was just puking oil out the front. So I let the bike sit for about a week. Cleaned off all the oil. Started the bike... Only running on 3 cylinders (1,3, & 4). I have spark... So thought it was fuel related (carbs where professionally cleaned and rebuilt over the winter), took the carbs off and inspected #2 carb for issues. Took the jets out, sprayed carb cleaner threw the ports, and put it back on the bike. Still not running right. So I decided to adjust the valves (never been adjusted). All the valves where out of adjustment. Took the bike out on the road, and it ran great! All 4 cylinders firing and noticed a big difference in power. 2 days later, go to ride the bike... Its running great, 20 mins into the ride, I could feel a lost in power, and difference in the exhaust tone. Pulled over and #2 pipe is warm, and the other 3 are super hot. Went to ride home, prob. 3 mins before I got to my house, cylinder 2 came back, and it ran great. Went for a ride today... Same thing. Had all 4 when I left, 3 when I got home....

Any ideas?

On a side note, fuel has dumped out of the hose that is connected between carb 1 and 2 when running. Happened twice. Once when I just put the carbs back on the bike and the second time was when I was sitting at a stop light right before I got home.

Here is my set up:
Rebuilt carbs w/ Dynojet Stage 3 jet kit
Straight pipes (no mufflers)
Pod Air Filters
Sportster tank w/ Harley petcock
 
Float level in carbs or a faulty petcock. Pull vacuumline off and check and see
If it has fuel i. It. If it does that is your problem
 
Check the resistance of your right side coil. Make sure its around 300 ohm. Also, unscrew the boot connected to the wire, and look for corrosion, if there is some, trim it back with wire cutters, reattach and you should be good.
 
Check your oil level, maybe your harley petcock isn't right or your "professionally cleaned and rebuilt " carbs have bad needle seats and your crankcase is overfilled with fuel.
 
Pull the vacuum line on the petcock and see if it has gas in it.
 
yoshisakan said:
Check the resistance of your right side coil. Make sure its around 300 ohm. Also, unscrew the boot connected to the wire, and look for corrosion, if there is some, trim it back with wire cutters, reattach and you should be good.
Click to expand...

Corrosion on coil side of the wire or plug side of the wire?

Thanks everyone for your input
 
You must log in or register to reply here.
Back
Top