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REAR PLUG dry black, front OK

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  • #41
    yes 172.5 is what i meant, i have the standard RSC and barons recommended 4th clip, one washer and plastic under. she really is running well now, im gonna wait and see. and check a plug. docV, there were conflicting opinions on whether the choke knob trimming really made any difference(at our OLD RSC). where are we at now with this question? it still needs only a tiny bit of choke , which must be turned off quickly or it sputters(at 85 degrees F) im wondering if i should just go ahead and reinstall the OEM PMS, LIKE u guys suggested. maybe just replace the oring willly nilly.

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    • #42
      I remember Curt recommending it. Not sure why but I think I may have had something to do with SVS and running too rich... But I could be wrong. I tried it on my old 1600 for the hell of it and never really noticed a difference.

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      • #43
        I was told some years ago, and my memory is not the same in my older years, but my grandpa said if it pops thru the carb, fuel issue?, if it pops thru the exhaust, ignition issue?, or the other way around?? but that was in reference to automobiles, same for carb bikes?

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        • #44
          I have an 04 too. I have all jetting and settings as per recommendations here except one additional step up on pilot. I ride spring and fall early mornings and needed the increase in fuel to run right. Since stock all of my plugs show tan in front and slight dark in rear no matter what intake or exhaust or jetting I had. All stayed near the same. Next winter I will be changing intake and porting myself. Will see if that helps match front to rear plug colors. Have any guys notice after porting a more equal coloration of plug ends?

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          • #45
            Left front right rear plugs changed 2 seasons ago. Previous plugs were identical in color.

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            • Doc_V
              Doc_V commented
              Editing a comment
              FWIW, on both my 1600 and 1700, my plugs look pretty much same front to rear with only slight differences..

            • Jclevesque
              Jclevesque commented
              Editing a comment
              Both my pipes leave a slight gray on my fingers with clear outline of fingerprints. Based on my readings about tuning its spot on. Not gonna crack my skull about my plug readings. Thanks for the info Doc!

          • #46
            i started this thread as REAR PLUG dry black, front OK,

            but it has sort of graduated away from that. now its more of a "maybe stage 1 exhaust with a universal KN air filter doesnt need as much jetting as complete aftermarket exhaust" (and a univ. KN)

            i have 2 2004's , and an 05, they all run great, im gonna rethink their jetting now tho.

            BTW, i just bought asother BAD ASS bike.

            a 2002 XV250 virago. 400 actual miles, showroom condition, smooth as glass. original tires, air filter disintegrated. $1500. having fun , my daughters are practicing on. I guess i gottta sell the XS650 now.

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            • #47
              ok, after a week with 170, its back to the 172.5. runs good, and way better off idle around 1500-2300 rpms, no jerking going on ,still seems to start too easy without choke, so im gonna inspect the choke knob. if i was to downsize the PMS AIR JET, would that allow less fuel thru the PMS also?

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              • #48
                UPDATE, short jaunt driving, im getting 31.5 mpg, needs slight choke to start, but immediately have to unchoke (80 degrees and up ambient temp). im slowly closing PMS knob.......

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