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  • setup carburetor

    [COLOR=rgba(0, 0, 0, 0.87)]I have a yamaha road star 1700, filter k & n open, empty exhausts, main jet is dyno jet 195, pilot jet- 35 mikuni.it is a poor mix, it is from the silencer and the free spins are freezing[/COLOR]

  • #2
    Do you also have a dynojet needle? If so throw the 195 main jet away(Way to rich) and replace it with a Mikuni 172.5 main jet. Also buy a Mikuni 40 pilot jet to install. Put the needle clip in the 4th groove with the plastic spacer and 1 silver washer under the clip, turn the PMS screw to 2 1/4 - 2 1/2 turns out. You may still get a little popping on decel due to your gutted exhaust with no back pressure but it will be jetted about as close to perfect as you will get with your setup.

    BTW

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    • #3
      Thanks davej ,
      [COLOR=rgba(0, 0, 0, 0.87)]I had such a setup before and it is still a lean mixture, and besides, it goes out of rotation for a long time and the engine runs unevenly on free[/COLOR] This works beautifully
      https://youtu.be/JXx2vrKkVJQ

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      • #4
        Sounds like your idle is set too low. It should be set at 900 rpm when the bike is warmed up after a ride.

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        • #5
          If that bike in the vid is warm, the idle is very low.

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          • #6
            Your idle is too low like said above. If you have a lean mix with the jetting you said with a 195 main jet that tells me you have an air leak somewhere. A 195 main jet should be very rich. The jetting I recommended is the jetting that has been proven correct for your bike. If you are having a problem with a lean condition you have an air leak somewhere

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            • #7
              [COLOR=rgba(0, 0, 0, 0.87)]I checked and left the left air everywhere[/COLOR]
              [COLOR=rgba(0, 0, 0, 0.87)]my spark plugs[/COLOR]
              Attached Files

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              • #8
                Check the color of your plug against this chart.

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                • #9
                  Thanks for the help and what are your spark plugs looking like?

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                  • #10
                    ]in my engine the engine speed with the pms of 3.5 outputs stops increasing

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