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    stalling out/ driveability issues

    I just recently picked up what I was hunting for a while; a relatively clean '89 Hawk. Seems to have a couple issues however, and I could use some advise for narrowing down what they could be. BTW, sorry for the wordy description below!

    I'm not sure how the fuel pump is supposed to function, but it seems to not work consistantly. 3 times now, once I've gotten ~80-90 miles on a tank, the bike will sputter and die, regardless of what the petcock is set to. The bike will misfire once or twice as a warning, then within ~ 20 seconds, sputter down and cut off. I've taken the cover off the pump, and the metal flapper doesn't consistantly click back and forth; just bumps sporatically.

    I thought this was the only issue, so I just made sure to top off every 80 miles are so. However, this evening, after only 40 miles on a full tank of gas, I heard it sputter once briefly while I was on a highway ramp, then a few seconds later, it began to misfire, lose power, and ultimately cut off completely. Since I was on a busy highway, when it began to sputter, and gave it full throttle, and it pulled smoothly as it should for several seconds, then the sputtering got worse. Once parked, I was unable to get it started, and the battery died quickly.

    A friend showed up with jumper cables, and the bike cranked right back up (roughly 25 minutes after quitting.) This has been the case each time, although obviously, this time with less mileage on the tank.

    Should I be looking at a faulty stator? Maybe a bad ground? Almost definitely a fuel pump?

    The bike has 12k miles on it, the main jets have been changed, and it has a full Two Brothers exhaust. Supposedly the battery is new, and one of the previous owners had said that the fuel pump cut off on him once, but he just popped the cover off, and pushed the center pin in to get it started again..

    Here's a picture of the lil' devil;

    #2
    Did the bike sit for a while??? I had a bike once work like this intermitantly and it was gum in carbs, a quit rebuild and she ran like new...Maybe a blockage in the fuel system in one of the filters maybe?
    Damn right it's a Hawk GT

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      #3
      Mine does almost the same thing- and it sat for awhile before I bought it. The difference between your symptoms and mine is that mine usually starts right back up. Doc helped me clean out the carbs back in March, but I'm guessing that there is still more cleaning to do. After this riding season I plan on soaking the carbs in cleaner to see if that solves the problem.
      '88 Hawk GT
      '89 Harley FXSTC
      2008 Yamaha V-Star 1300 tourer

      http://www.hawkgtforum.com/viewtopic.php?t=948

      "...my performance ain't perfect, but its loud, and its fast..." -Widespread Panic

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        #4
        Actually, mine did sit for a while too, but how long, I'm not certain. Sounds like it's time to strip her down and do some serious cleaning!

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          #5
          BTW, where's the best place to get a service manual? I haven't stumbled upon any on Ebay yet..

          Comment


            #6
            At the top of this section you posted in!

            http://www.hawkgtforum.com/viewtopic.php?t=1404

            Bill

            Comment


              #7
              Keep lookig on E-bay if you have to have a paper copy.
              There is an electronic .pdf format free with a cool wiring diagram in color attached to the top of this forum section as a sticky.
              -I'm sorry....I did not know she was your sister.
              -If Buckleys cold mixture went rancid......how would anybody know????
              -Dont piss off the quiet guy with the chain saw.

              Comment


                #8
                http://cgi.ebay.com/ebaymotors/88-91...spagenameZWDVW
                '88 Hawk GT
                '89 Harley FXSTC
                2008 Yamaha V-Star 1300 tourer

                http://www.hawkgtforum.com/viewtopic.php?t=948

                "...my performance ain't perfect, but its loud, and its fast..." -Widespread Panic

                Comment


                  #9
                  Maybe a clogged fuel filter?
                  Brian - Richland, WA
                  1991 Hawk GT
                  1997 VFR

                  Comment


                    #10
                    get compressed air and blow backwards through the petcock (with fuel cap open)...........drek can clog intake tubes sometimes.

                    as for fuel pump, it does NOT click continuously in normal operation. if pump does click continuously, it most likely means that pump is not getting fuel from tank. pull inlet line to fuel pump and check that you get a good free flow of fuel from tank. something to remember about fuel pump: it does NOT suck fuel, only pushes fuel it gets.

                    stator or ground irrelevant to this problem, but charge your battery until it shows at least 12.6 volts.

                    good luck
                    "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.

                    Comment


                      #11
                      Yeah the fuel pump is designed only to run when theres no or little pressure in the line , otherwise it shuts off...One thing you might want to do is run the troubleshooting test out of the manual on your fuel pump relay...
                      1989 Hawk Gt

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                        #12
                        ...and if all that carb/fuel/pump/relay checking fails, check your grounds and your spark plug cables. Intermittent, inconsistent misfiring/dying old ass cables/connections acting wonky.

                        Comment


                          #13
                          doh, there meant to be a "could be" in between "misfiring/dying" and "old ass cables/connections".

                          need more beer to help the noggin.

                          Comment


                            #14
                            Thanks for all the quick replies! I'll probably tear into it tomorrow evening, and have a look-see. I rode it to a GTG nearby tonight with no issues (of course), but I'm not chancing getting stranded in das ghetto again

                            Comment


                              #15
                              Update #1:

                              Pulled the tank, pump, and fuel lines. I've sloshed the tank around a bit, but still haven't noticed any floating debris. However, the inside of the tank is a bit nasty.. I honestly don't know to what degree though.

                              The pictures make it look worse, but this is a wet section (with camera flash);



                              The streak on the upper left is where I rubbed my finger;


                              So.. could this be the issue? Little bits of debris clogging the carbs and stalling the motor?

                              I used a Kreeme treatment on my old GS500, but it was a miserable job. What other options am I looking at?


                              Also, the petcock doesn't seem to have a functioning "off" position. Fixable, or am I spending some more $$?

                              Comment

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