Announcement

Collapse
No announcement yet.

Running but don't ask for much above 1/4 - 1/2 throttle

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Running but don't ask for much above 1/4 - 1/2 throttle

    Hello again.

    !982 GS 850G. I should have never let this thing sit! Got it runnig at idle, great, then wouldn't go much over 45, it literally ran out of gas, or felt like it. Still an air problem, or a gummed up petcock. Pulled and checked petcock, clean, flow is apropriate. Next down the line Vacuum. Surely this 38 year old line wouldn't be leaking...replaced. Replaced one side of the airbox seal, the access for the filter. The other side seemed okay, and this may be a problem, I didn't change it. As far as the drain hose on the left side I replaced it, used part of the old hose to fit in the airbox, nice tight fit.

    Went for a nice, 100 mile ride yesterday! As long as it was flat and the engine required no real load it ran beautiful. However the test was the 12 mile 65mph hill out of Bullhead City coming home. She would pull at 55, so 1/4 throttleish. Ask more than that and forget it, 65, pushing half throttle, it would run but not smooth. Pulled plugs, looked okay, but I stupidly started it this morning before that. Pulled carbs, I thought there may be crud in the needle jet bores, nope clean. I did notice the tops of 3 needle jets were wet. Now when I put these together I heed the warning about soft brass and stripping so I did not or haven't bee gorilla tightening them. Today I did indeed go tighter, seat the jet, and 1/4 turn or so. I am thinking you have have some tightness to pull the needle jet down and seat it in the carb body. Maybe I was too loose before and there was a leak? Yes I will seal the other side of the airbox.

    I took a hose (no not a compressor, lung power) and blew in to the passage for the slides, just enough to raise them to the top. All went up and back down. Three of them are original, one is 10 years old, as well as the 3 spares in my tool box. No holes but you can tell they are old. I am saving these expensive pieces for a failure. If the old ones ain't broke, why replace them? Or am I being cheap and foolish. I know one day they will become Unobtainium.

    When I checked the petcock I applied constant vacuum, gas flowed nice. But I notice the engine applies vacuum at a pulse, could there be an internal petcock failure I am not picking up? I did see if it would leak down when I had it off and was checking the 38 year old vacuum line for leaks (it did leak either but got replaced).

    Thanks
    Val

    #2
    Vacuum pulses regularly. time for the carb rebuild with new orings to get the jets and passages in the bodies clean again.



    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


      #3
      Hey pvasc, check your private messages.
      1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

      Comment


        #4
        Originally posted by pvasc View Post
        I took a hose (no not a compressor, lung power) and blew in to the passage for the slides, just enough to raise them to the top. All went up and back down.
        Please give more details on this.

        There is no "passage for the slides" that you can blow into to raise them.

        They are raised by air going under the slides (through the venturi) and into the engine.

        .
        sigpic
        mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
        hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
        #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
        #2 son: 1980 GS1000G
        Family Portrait
        Siblings and Spouses
        Mom's first ride
        Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
        (Click on my username in the upper-left corner for e-mail info.)

        Comment


          #5
          he means the oval at the top of the venturis...blow in them and air velocity will raise the slides. air velocity entering the carb is trapped with the oval to an extent..which makes slides rise. Tape one over and blow all you want through the venturi and nothings gonna happen
          Last edited by chuck hahn; 03-02-2020, 09:02 AM.
          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

          Working...
          X