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Weak idle until hot

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    #16
    Originally posted by Rob S. View Post
    Any bike without a hand shifter and manual spark advance is for wimps.
    Need a foot clutch, too.
    Dave
    '79 GS850GN '80 GS850GT
    Only a dog knows why a motorcyclist sticks his head out of a car window

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      #17
      Happened again this morning and she cut out twice in traffic. Ran fine a few minutes later when warmed up. I'm wondering if it's a float level problem. Could a needle valve get stuck closed and starve a carb for fuel until it warms up enough to get unstuck? It really feels like it's firing on three until it warms up full.

      The odd thing is it's idling fine off choke when it's cold. It's a weak idle only after running for 5 min

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        #18
        Stop fishing. Time to go back to square one and verify everything. Start with cam timing. Valve clearances. Ting advance working right and not stuck and no freeplay in the counterweight springs. Then dynamic timing. Carb sync with guages. Mixture screws set right. Are plugs sooty or ash grey... .. everything matters. To me it sounds that when its hot it leans out for some reason. Are the pilot and main jets the right size according to the manual.....
        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.

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          #19
          Service manual here in case you dont have one.

          BikeCliff's Website​
          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.

          Comment

            #20
            Originally posted by chuck hahn View Post
            Stop fishing. Time to go back to square one and verify everything. Start with cam timing. Valve clearances. Ting advance working right and not stuck and no freeplay in the counterweight springs. Then dynamic timing. Carb sync with guages. Mixture screws set right. Are plugs sooty or ash grey... .. everything matters. To me it sounds that when its hot it leans out for some reason. Are the pilot and main jets the right size according to the manual.....
            Appreciate the advice. The leaning out is what I'm thinking as well. Maybe it's a case where some cylinders are rich on idle and some are lean.

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              #21
              I would look up what stock jets are per tge service manual. IFF you dont have STOCK pipes and airbox go up one size on jets. Also i asked what the plugs look like. Sooty is rich and TOO RICH makes it run like crap because it can burn alll the gas. Same with ashy white plugs. too lean and not enough gas to produce power. You need to check it all and guessing isnt gonna cut it
              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.

              Comment

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