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1999 Bandit 1200 needs mechanic

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    1999 Bandit 1200 needs mechanic

    Recently purchased 1999 Bandit 1200 S. Great bike "BUT", while just crusing, just maintaining speed, 40, 60, 75, engine misses & blubbers constantly. As soon as the engine gets in the slightest pull or strain, give the thing the slightest throttle or start up a moderate hill, the engine smoothes out, purrs, pulls, & runs like a perfectly tuned engine. I've ridden it appx. 1000 mi. & it doesn't seem to be hurting anything yet, I haven't noticed any differences so far, but I know it can possibly keep getting worse. With mechanics charging towards $90 pr hr. won't take many hr. labor & it may not be worth fixing. Just looking for suggestions. Thanks
    1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

    #2
    Does the bike have a modified exhaust and/or intake system? Is the air filter clean?
    Ed

    To measure is to know.

    Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

    Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

    Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

    KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

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      #3
      V&H slip on, orig air box & clean filter, don't know about carb jetting.
      1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

      Comment


        #4
        If its anything like our old GSs even a small air leak can cause trouble. Is the airbox lid tight ? Are there leaky boots or gaskets between the engine and carbs ?
        82 1100 EZ (red)

        "You co-opting words of KV only thickens the scent of your BS. A thief and a putter-on of airs most foul. " JEEPRUSTY

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          #5
          I'd try tweeking the pilot screws, assuming the bike has them. Most likely the exhaust has messsed up the mixture.
          Ed

          To measure is to know.

          Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

          Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

          Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

          KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

          Comment


            #6
            I've got far enough in life my eyes, hands, fingers, & brain don't work like they did 30 yrs. ago. I've tried to see the boots were straight & all the way on, clamps were tight, & covers were properly in place. Everything looks good & unmolested, but I'm not sure of anything
            1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

            Comment


              #7
              Wondered about the exaust, a complete system should affect the carbs but figured a slip on was for sound & weight.
              1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

              Comment


                #8
                Check you float heights. These bikes are temperamental as crap with that... Trust me check em!. 14.7mm is the sweet spot. While your in there make sure your still running stock mains. 102.5 off the top of my head.

                I'll tell you though I'd recommend upgrading to a K&N filter with 2" hole. In the air box. Run 127.5 mains and 35mm pilots. Also add a shim to the stock needles. It will be a new bike trust me... good luck!
                Jedz Moto
                1980 Suzuki GS1000G
                1988 Honda GL1500-6
                2018 Triumph Bonneville T120-
                2020 Honda Monkey Z125
                2001 Honda Insight - 65MPG
                Originally posted by Hayabuser
                Cool is defined differently by different people... I'm sure the new rider down the block thinks his Ninja 250 is cool and why shouldn't he? Bikes are just cool.

                Comment


                  #9
                  i had a guy who's pilots would close up twice a year on his 1200 and i would have to clean them.(lack of riding)
                  if you had a set of rs36/38's to toss on it and go for a ride you will see it's a carb problem.
                  just my opinion.

                  Comment


                    #10
                    Thanks guys, Of course I baught it like this so I don't have a clue how long it's been like this, Don't have a clue when the V&H was slipped on or if it's been running like this since then, or may have sat for an extended time, then when got out & fired up it may have been like this. 8000 mi. on a 13 yr. old bike, it's sure sat sometime, no way to know when or how long. Also not sure of jets or shims, I got no history as I baught the bike from a "used car lot", of course they knew nothing about it. I apreciat the opinions, that's what I was was wanting, but if anyone has a guaranteed fix, come on down & I'll pay you to fix it. Thanks again guys
                    1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

                    Comment


                      #11
                      +1 with Terry. Clean out your carbs first. Sounds like she's starving in the pilot circuit. You can try running seafoam through a couple of tanks but a proper cleaning is definitely in thr cards. Also get you floats to the proper height. I was chasing a similar issue on my old B-12 and it was the float heights the whole time. To avoid the issue run Stabil marine formula every fill (blue Stabil). I cleaned my carbs once on my B-12 and never cleaned them again after all the adjustments were set..of course the bike never sat and saw 10-15k Miles a year...

                      FYI...
                      Jedz Moto
                      1980 Suzuki GS1000G
                      1988 Honda GL1500-6
                      2018 Triumph Bonneville T120-
                      2020 Honda Monkey Z125
                      2001 Honda Insight - 65MPG
                      Originally posted by Hayabuser
                      Cool is defined differently by different people... I'm sure the new rider down the block thinks his Ninja 250 is cool and why shouldn't he? Bikes are just cool.

                      Comment


                        #12
                        Little help with pics

                        Originally posted by Jedz123 View Post
                        Check you float heights. These bikes are temperamental as crap with that... Trust me check em!. 14.7mm is the sweet spot.
                        can you post a pic of that? I'm goin' thru the carbs on mine right now and want to check. X2, the pilot circuit got gummed up after the last go round.
                        1981 GS750L (sold)
                        1981 GS750L (current)
                        1978 Yamaha RD400 (RD = Race Development)
                        1981 Honda CT70 (86+ MPG at WOT most of the time)
                        1983 GS1100GL (needs work: update, gone to a new home)
                        1956 Simplex (with a TS250 motor)
                        1985 GS1150E (Hammer Time!!)
                        1998 1200 Bandit (Rattler)
                        1980 GS1100L (Janice)
                        Do I continue?

                        "An unarmed man can only flee from evil, and evil is not overcome by fleeing from it." - Col Jeff Cooper
                        e tan, e epi tan

                        Comment


                          #13
                          Love too... But I sold my B-12 to Lurch awhile back.

                          Currently looking into doing a partial trade and my coin for HJFisk's ZRX 1100 but if that falls through I'll be bringing my monies to someone with a B-12...
                          Then I could post some pics.
                          Jedz Moto
                          1980 Suzuki GS1000G
                          1988 Honda GL1500-6
                          2018 Triumph Bonneville T120-
                          2020 Honda Monkey Z125
                          2001 Honda Insight - 65MPG
                          Originally posted by Hayabuser
                          Cool is defined differently by different people... I'm sure the new rider down the block thinks his Ninja 250 is cool and why shouldn't he? Bikes are just cool.

                          Comment


                            #14
                            Originally posted by rphillips View Post
                            V&H slip on, orig air box & clean filter, don't know about carb jetting.
                            I had a '98 B12 for a while and I know exactly what you are talking about. It too would "surge" ever so slightly when the throttle was held steady during highway cruising. The induction and exhaust system on mine was completely stock. As they came from the factory the bikes were jetted boderline lean. With the V&H slip-on I imagine your's is a bit more leaner than stock and that is showing up in the steady state "surge" and occasional "burble" while cruising. Bump the jetting up a notch and I would say the problem will be resolved.

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