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    Fuel starved?

    Bought a Hawk a while back. As far as I know, motor's stock except a Delkavic shorty slip-on. I thought there might be a problem with one of the cylinders cutting out at high rpm and big throttle openings, but wasn't sure. It happened rarely. Decided to have the airbox replaced with pod filters, jets, etc., the work being done by a highly reputed mechanic. Still has the cut-out problem, maybe worse do to more air and fuel being on demand. I changed the fuel filter and removed the pet-cock screen; didn't solve problem. I was advised to check the fuel pump, but the filter was clean that I changed, and it seems the fuel pumps a sealed unit that would just have to be replaced to check. Thinking maybe a float level problem in a carb; the problem seems more likely to occur going up hill. Thought I'd see if anyone else is experienced with this problem and can suggest possible causes.

    #2
    You need to buy a manual. It is possible to check the fuel pump although I doubt that is it. Could be a lot of things. Spark plugs, float levels, torn diaphragms, valve adjustment.
    Brian - Richland, WA
    1991 Hawk GT
    1997 VFR

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      #3
      Thanks; Sounds like good advice.

      Comment


        #4
        Originally Posted by bk94si View Post
        You need to buy a manual. It is possible to check the fuel pump although I doubt that is it. Could be a lot of things. Spark plugs, float levels, torn diaphragms, valve adjustment.
        Faulty tank vent.....intermittent ground........only 3 things in diagnostics....Fuel/Fire/Air.......always one or the other.... change one thing at a time.......

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          #5
          Originally Posted by efishone View Post
          Bought a Hawk a while back. As far as I know, motor's stock except a Delkavic shorty slip-on. I thought there might be a problem with one of the cylinders cutting out at high rpm and big throttle openings, but wasn't sure. It happened rarely. Decided to have the airbox replaced with pod filters, jets, etc., the work being done by a highly reputed mechanic. Still has the cut-out problem, maybe worse do to more air and fuel being on demand. I changed the fuel filter and removed the pet-cock screen; didn't solve problem. I was advised to check the fuel pump, but the filter was clean that I changed, and it seems the fuel pumps a sealed unit that would just have to be replaced to check. Thinking maybe a float level problem in a carb; the problem seems more likely to occur going up hill. Thought I'd see if anyone else is experienced with this problem and can suggest possible causes.
          Maybe you're just encountering the rev-limiter? 9200 rpm? Stock CDI kills ignition at 92-9300 rpm.

          Comment


            #6
            maybe replace sparkplugs and do a carb cleaning.
            "It's only getting worse."


            MY rides: '97 VFR750, '90 Red Hawk, '88 Blue/Black Hawk, '86 RWB VFR700 (3), '86 Yamaha Radian, '90 VTR250, '89 VTR250 (2), '73 CB125, '66 Yamaha YL-1

            Sold: '86 FJ1200, '92 ZX-7, '90 Radian, '73 CB750, '89 all-white Hawk, '88 blue Hawk, '86 FZ600, '86 Yam Fazer 700 , '89 VTR250, '87 VFR700F2, '86 VFR700F.

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              #7
              What jetting do you have in it?
              Don't spend money and buy, spend time and learn.

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                #8
                Originally Posted by bk94si View Post
                You need to buy a manual. It is possible to check the fuel pump although I doubt that is it. Could be a lot of things. Spark plugs, float levels, torn diaphragms, valve adjustment.
                You don't exactly have to buy one... You can even download one.

                https://drive.google.com/file/d/0B0G...8Z_GecZYXYZAmw

                88 Blue Hawk GT - Under construction but rideable (guest approved)
                89 BlackHawk 2.0 - On the lift and being assembled
                90 Hawk GT (color as to yet be determined) - Still on the shelf in crates

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