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Thread: Getting close to giving up, bike wont run on all 4 cylinders

  1. #1
    Join Date
    Sep 2020
    Location
    Rochester New York
    Posts
    23

    Angry Getting close to giving up, bike wont run on all 4 cylinders

    Hi everyone. Mysterious, unsolvable problem with my 82 650gl that no shop around me is bothered to look at

    New parts: Air filter, plugs, coil pack, and carbs were just cleaned with new air flow screws
    All intake boots are good and every air connection is tight. Petcock works fine, gas instantly pours out full stream when on prime and actuates when on vacuum.

    What works: Good compression, good spark in all four, gas is reaching the carbs, carbs are cleaned and gas is getting to engine.

    The issue: No matter what I do, this bike will not run on all 4 cylinders. It has no problem starting up and running as long as it can, but it will only run on 2-3. When it's like this, it will only idle at 4000 rpm, is slowly responsive to gas but rpms will increase all the way, and nothing will lower the idle. The other option, when moving around plug boots, is it will run on 2-3-4. When it does this, it idles fine at 1500, but dies if you give it any throttle. Before doing the carb rebuild, it would run on 1-2-4, so I know cylinder 1 is fine.

    What else can I check? Running out of options here. Maybe Ill get the carbs professionally rebuilt? They weren't that dirty when I cleaned them, I don't think thats an issue.
    1982 GS650GL

  2. #2
    Join Date
    May 2009
    Location
    Norman, Oklahoma
    Posts
    24,924

    Default

    Bench sync them and vacuum gauge vsync them once running. do valve adjustments. check float hts per the service manual specs
    MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
    1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

    NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


    I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

  3. #3
    Join Date
    May 2009
    Location
    Norman, Oklahoma
    Posts
    24,924

    Default

    STORE THIS PLACE. service manuals and carb turtorials on right margin

    http://members.dslextreme.com/users/bikecliff/
    MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
    1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

    NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


    I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

  4. #4
    Join Date
    Sep 2008
    Location
    Omaha, Ne.
    Posts
    2,749

    Default

    My only concern is how well the carbs were cleaned and by who.
    They MUST be completely torn apart and either soaked overnight in Berrymans carb dip or ultra sonic cleaned. No shortcuts permitted.
    As Chuck says, follow up with a good bench sync then vacuum sync.
    Larry

    '79 GS 1000E
    '93 Honda ST 1100 SOLD-- now residing in Arizona.
    '18 Triumph Tiger 800 (gone too soon)
    '19 Triumph Tiger 800 Christmas 2018 to me from me.

  5. #5
    Join Date
    Sep 2008
    Location
    Omaha, Ne.
    Posts
    2,749

    Default

    I also see no mention of the last time you checked valve clearance. Very important.
    Larry

    '79 GS 1000E
    '93 Honda ST 1100 SOLD-- now residing in Arizona.
    '18 Triumph Tiger 800 (gone too soon)
    '19 Triumph Tiger 800 Christmas 2018 to me from me.

  6. #6
    Join Date
    May 2009
    Location
    Norman, Oklahoma
    Posts
    24,924

    Default

    I do rebuilds. Contact me via a PM should you need me.
    MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
    1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

    NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


    I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

  7. #7
    Join Date
    Sep 2020
    Location
    Rochester New York
    Posts
    23

    Default

    How could valve clearance cause this issue though. I know the all cylinders are capable of running since they have before, but besides that all compression is good.
    1982 GS650GL

  8. #8
    Join Date
    Sep 2020
    Location
    Rochester New York
    Posts
    23

    Default

    Personally cleaned, they weren't soaked just sprayed. But again from my perspective they really weren't very dirty, which is why I am hesitant to putting money into getting them professionally done, but I'll look into it
    1982 GS650GL

  9. #9
    Join Date
    May 2009
    Location
    Norman, Oklahoma
    Posts
    24,924

    Default

    ok.....so youre problem is most likely still dirty tiny passages in the carb bodies or way out of sync. i would try doing a very very careful bench sync first. set the top mixture screws at 1 1/2 out from gently seated. Be sure the tips arent broke off inside the holes too.
    MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
    1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

    NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


    I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

  10. #10
    Join Date
    Feb 2018
    Location
    Davis,CA.95616
    Posts
    651

    Default

    Quote Originally Posted by chuck hahn View Post
    ok.....so youre problem is most likely still dirty tiny passages in the carb bodies or way out of sync. i would try doing a very very careful bench sync first. set the top mixture screws at 1 1/2 out from gently seated. Be sure the tips arent broke off inside the holes too.

    This is good advice,thanks Chuck

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