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Reset PMS or change pilot jet?

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  • Reset PMS or change pilot jet?

    Recently, I decided to check the plugs on my '07 R* to see how it was burning the fuel mixture. Three of the four plugs show what I 'think' is running a bit rich... a black powdery looking deposit. However, I discovered that 'somehow' the electrode on one of the front cylinder spark plugs was tighter than recommended. Could this have caused abnormal combustion? Do I wait until I've ridden a bit and recheck the plugs? Or should I just go to a smaller main jet or pilot jet?

  • #2
    Boomer how does it run? Before jumping in and start changing things tell us your intake, exhaust and current carb setup.

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    • #3
      Its been running pretty well. Mileage isn't all that great, but then again, I have to ride at 80 in a 70 MPH area just to keep from being run over. That, plus the aroma of gasoline seems to permeate the area around the bike (its pumpless).

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      • Duke
        Duke commented
        Editing a comment
        If your gas cap is modified to vent, you will get a gas smell most of the time.

    • #4
      Replace the plugs with stock NGK gapped at
      ​​​​​​. 035 and see if that does it. I had an issue where plugs out of the box were gapped inconsistently/too tight.
      LET'S RIDE

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      • #5
        Gas cap has not been altered.

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        • #6
          Does it start too easy without too much choke/enricher?

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          • #7
            Yes. Warms up quite quickly.

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            • #8
              what size main jet and pilot jet is in it? easy starting and quick warm up is an indication of a large pilot jet

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              • #9
                175 main jet, 40 pilot

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                • #10
                  Originally posted by boomerA View Post
                  175 main jet, 40 pilot
                  If you have baffles in aftermarket exhaust/ and a K/N type air filter and are using a Barons jet kit you should have a 172.5 mikuni main jet ,40 pilot clip in the 4th groove of the needle and about 2 1/2 turns out on the pms

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                  • #11
                    ,Seedstar needle, Cobra Dragster pipes.

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                    • davej
                      davej commented
                      Editing a comment
                      with a Speedstar needle you should be OK with the 175 main jet.

                  • #12
                    You could also have a problem with the choke cable. These are known for the one end not doing what the other end tells it to do

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                    • #13
                      I recently replaced the ENRICHENER cable and coasting enrichener cover and diaphragm.

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                      • #14
                        Yeah I live in Florida and only one of my road Stars really needs to choke unless it's cold of course. On my trike I screwed the PMS into one and a half turns out and now it needs more choke to start so correct me if I'm wrong but turn the PMS in is about the same thing as going to a smaller PMS jet and screwing it out. One thing I can't get over is how the oil always smells like gas on these road Stars even with the petcock turned off religiously. Could that be because they Yamaha bulletinized the float level up to 4-5 mm above the seam on the left rear hand corner of carb while the bike is sitting vertical?

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