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    #1

    i have no idea

    i have a 79 gs 850 that was layed down a few weeks ago. i messed up the right side points in the crash, and replaced both points. i set the points to the propper gap the bike ran right then started acting up. backfireing all through the rpm range. off the line if i give it gas it just breaks up, i have to ride the clutch out and VERY solwy give it gas just to get it going. and it wont go over 65mph and it falls on its face at about 4500rpm, and uses large amounts of gas. it runs like its out of gas but its not. sometimes if i mess with the points and set the gap again it will run right for a few miles then start acting up

    its weird becaus after i replaced the points it ran great for a week then i took a 60 mile trip and half way through it is when it started running like it was out of gas and i had to short shift and i could not get the bike over 60. thats when it all started.

    it has,
    brand new points
    good gas
    clean carbs
    proper gas flow

    i really dont know whats wrong and its starting to annoy me

    please help, nick
    Tags: None
    #2
    Greetings and Salutations!!

    Hi Mr. nick gerofsky,

    I'll offer a few suggestions. If you are absolutely sure that the ignition is sorted out then I'd look at the carbs. It's possible the "lay down" stirred up rusty sediment in your tank and it got sucked into the carbs. In which case a good carb cleaning and rebuild (with all new O-rings) would be in order. Or it could be that the vacuum line to the petcock was damaged or loosened. Or it could be that now you have a sticky float in one of the carbs. Also, check the "Electrical Odds and Ends" page of my website for ignition troubleshooting tips and other information. That's about all I've got for now except for your "mega-welcome". It includes a couple of maintenance lists necessary to restore/keep your classic GS in top condition. And you'll find lots of GS850G lovin' on my website. Let's get started.

    I just stopped by to welcome you to the forum in my own, special way.

    If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....

    Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", the Carb Rebuild Series, and the Stator Papers. Now let me roll out the welcome mat for you...

    Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

    Thanks for joining us. Keep us informed.

    Thank you for your indulgence,

    BassCliff

    Comment

      #3
      Check the advance/retard unit on the end of the crankshaft. It is in a very vulnerable position and could be easily damaged in an accident. Make sure the cam is free to rotate and allow the ignition to advance correctly as the revs build. If it is notchy or not smooth, or binding in some way then pull it apart and do the necessary repairs to have it operating smoothly.

      Comment

        #4
        Originally posted by Suzuki_Don View Post
        Check the advance/retard unit on the end of the crankshaft. It is in a very vulnerable position and could be easily damaged in an accident. Make sure the cam is free to rotate and allow the ignition to advance correctly as the revs build. If it is notchy or not smooth, or binding in some way then pull it apart and do the necessary repairs to have it operating smoothly.

        This is most likely the culprit. When I went down a couple of months ago, my points were mashed up and the bolt which held the advance in place was slightly bent, making it impossible to set the points. Replacing the bolt fixed it. Fortunately the advance unit wasn't damaged.
        1979 GS750E

        Comment

          #5
          I agree it sounds like timing. Can you put a timing light on it and check the timing? I did that with an off-brand bike I owned prior to the GS.
          If you don't own one, chances are you can rent one at your local auto parts store, like AutoZone.

          Comment

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