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More carb. sillness

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    More carb. sillness

    Roll on the throttle and acceleration is a bit soft until 4500 rpm when the bike takes off like a rocket to 8000 rpm.The same in all gears...The engine is smooth, no stumbling or misfiring, no surging ,just down on power until 4500...Applying the choke slightly makes no difference .Uni filters, vacuum chamber vents clear ,smooth consistent idle, starts quick hot or cold..Spark plugs show no signs of an over rich or lean mixture..Maybe the slides are slow to rise up?

    #2
    Have you put a carb kit in? Stock jets? Needles?
    Brian - Richland, WA
    1991 Hawk GT
    1997 VFR

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      #3
      The jets have the word Factory on them, the needles are not stock style

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        #4
        Then you could maybe try raising the needles a notch.
        Brian - Richland, WA
        1991 Hawk GT
        1997 VFR

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          #5
          Originally Posted by bk94si View Post
          Then you could maybe try raising the needles a notch.
          . yes.....I noticed the needles have corrosion pit marks...I just spoke to J Hord and ordered a new jet kit. He thinks it's jetting but said on occasion diaphrams that appear perfect may not be...








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            #6
            If you don't have a spare set of the diaphragms, you might consider getting them as the ordering process is precise and then they are on the shelf or in the bike for the rest of it's life. Rubber parts that are 30+ years old are pretty suspect.

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              #7
              read and study the tuning instructions furnished with factory pro and k&n/dynojet carb kits, both available online.
              "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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                #8
                7CDA6DA2-23AB-46BB-86B8-FB220DCAD323.jpeg I stopped dicking around and bought a new Factory Pro 3.0 kit from JHord.....#42 pilots, clip in needle middle notch, 158-153 mains,floats at 9.2mm.Uni filters, Cheap Ebay 1-3/4 core muffler. Checked the carb synch again with an air flow meter, best idle with screws 3-1/2 turns out.....the engine starts instantly cold with the choke needed for a minute or two...Good power off idle , no surging or flat spots and pulls cleanly to 8000 rpm...I am satisfied...
                Last edited by Hillbilly Bike; 09-26-2021, 09:05 AM.

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                  #9
                  Great news!
                  1988 Hawk
                  1989 Hawk
                  1998 ST1100
                  1999 ST1100
                  North Georgia

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                    #10
                    you might want to try #45 idle jets cuz with mixture screws out that far they loose spring tension and could fall out.
                    "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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                      #11
                      1. I had that happen once... A dab of RTV sealer will keep them in place and will easily break free if they need an adjustment. The low speed response seems excellent and I really don't want to mess with it again..My usual riding friend is a Euro bike snob, lol ...He rode the NT and actually admitted it's a nice backroad machine with a responsive engine.

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