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  • #46
    Coil problems happen in pairs, not a single cylinder.
    Try your hardest to be the kind of person your dog thinks you are.

    You can live to be 100, as long as you give up everything that would make you want to live to be 100!

    Current bikes:
    '06 Suzuki DR650
    *'82 XJ1100 with the 1179 kit. "Mad Maxim"
    '82 XJ1100 Completely stock fixer-upper
    '82 XJ1100 Bagger fixer-upper
    '82 XJ1100 Motor/frame and lots of boxes of parts
    '82 XJ1100 Parts bike
    '81 XS1100 Special
    '81 YZ250
    '80 XS850 Special
    '80 XR100
    *Crashed/Totalled, still own

    Comment


    • #47
      Coil related, if the later 3ohm Yammy coils check out 'marginal', and your a cheap-azz like me, locally bet you could come across a set of Honda VF series coils. For whatever reason Honda coils rarely go 'south'. Take your meter with ya' and check across both poles for 3ohm. Alot of the VF series coils were 1.5ohm and some 5ohm. I picked up aset locally for $20, went to NAPA got 5ft. of high-temp 7mm multi- steel wire and cut to length. Check that a used set of VF coils has the screw-on caps AND inner rubber sealing washers. Those can be got new from Honda if necessary. 8mm wire would of been my preferance.....just cause, but pretty sure that would have split the screw-on caps, which push the rubber seals against the coil side inverted flare for a water tight seal. If you get ham-fisted tightening the caps/ seals, the cap WILL split....DAHIK.
      BTW, the VF coils throw a 'hot' enough spark, that you'll NEVER 'drop' a cyl. due to richness unless you just pour the fuel in the cylinders.....and they ARE plug'n'play. If you end up going that route, same thing, unsolder your OEM wire plug-ins and re-solder to the VF coils.
      Interesting as to which gremlin you find is the culprit..... igniton related, fueling related, or a bit of both. Hearing your bike running on occassion even tho behind me a couple bikes, my bet is a bit of both. Just didn't have that crisp, smooth sound out the exhaust.
      81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

      Comment


      • #48
        Pulled the timing cover today, the breaker plate was stuck in the full retard position. That should not have caused the issue though since on WOT that's where it goes anyway.
        Greg

        Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

        ― Albert Einstein

        80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

        The list changes.

        Comment


        • #49
          Originally posted by BA80 View Post
          Pulled the timing cover today, the breaker plate was stuck in the full retard position. That should not have caused the issue though since on WOT that's where it goes anyway.
          I've left the vacuum advance disconnected/full retard and it ran like a goldfish on Benadryl but the engine didn't misfire or stutter.

          I don't about know about no vacuum advance at all at WOT on a normal engine though. It might drop back and retard at low speed when you pop open the throttle but the manifold should start to pull at least 2 inches of vacuum when the RPMs get rolling and the advance pot's all-in at only 6 inches.

          .
          -- Scott
          _____

          2004 ST1300A: No name... yet
          1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
          1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
          1979 XS1100SF: "Bush" W.I.P.
          1979 XS1100F: parts
          2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk" It's DEAD, it's not just resting. It is an EX cycle.

          Comment


          • #50
            NEVER go full retard

            John
            John is in an anonymous city with an Alamo (N29.519227,W-98.678980)

            Go ahead, click on the bikes - you know you want to...the electrons are ready.
            '81 XS1100H - "Enterprise"
            Bob Jones Custom Navy bike: Tkat brace, EBC floating rotors & SS lines, ROX pivot risers, Geezer rectifier, new 3H3 engine

            "Not all treasure is silver and gold"

            Comment


            • #51
              Originally posted by jwhughes3 View Post
              NEVER go full retard

              John
              Yeah, it's not really 'tarded, it's just stuck at baseline zero with no additional advance. Unless the '81s or XJs have a ignition Start retard circuit in their TCIs, none of the ignitions in these bikes retard anything.

              .
              -- Scott
              _____

              2004 ST1300A: No name... yet
              1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
              1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
              1979 XS1100SF: "Bush" W.I.P.
              1979 XS1100F: parts
              2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk" It's DEAD, it's not just resting. It is an EX cycle.

              Comment


              • #52
                Originally posted by trbig View Post
                Coil problems happen in pairs, not a single cylinder.
                Hey Tod,

                Usually that's right, but like IIRC TadRacer said, and I've seen it reported as well, when the voltage gets a bit LOW on one coil for any reason, the power of the spark drops...so that it can go thru the primary plug...but doesn't have enough power to then go thru the engine and back up the other plug on the paired coil....so a person gets 1 clyinder dropping out due to electrical problem....too low voltage to the coil.

                T.C.
                T. C. Gresham
                81SH "Godzilla" . . .1179cc super-rat.
                79SF "The Teacher" . . .basket case!
                History shows again and again,
                How nature points out the folly of men!

                Comment


                • #53
                  Yeah, my last set of coils just one cylinder died. I think one wire went bad.
                  Greg

                  Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                  ― Albert Einstein

                  80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                  The list changes.

                  Comment


                  • #54
                    +1 to T.C.'s last four words!......and if it goes on for too long.....slow death to the coils.
                    81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

                    Comment


                    • #55
                      The ballast resistor sort of guarantees low voltage doesn't it Brant?
                      Greg

                      Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                      ― Albert Einstein

                      80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                      The list changes.

                      Comment


                      • #56
                        Originally posted by BA80 View Post
                        The ballast resistor sort of guarantees low voltage doesn't it Brant?
                        Realative to the 1.5ohm coils it would. If initial pri. ignition voltage is low to begin with, then secondary coil votage is diminised even more, which leads to a 'weaker' plug spark, that plays favoring path of least resistance, leaving the other plug not having nearly as much fun makng explosions........I presume you were still runnin' the stock coils?
                        81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

                        Comment


                        • #57
                          Guys, the issue in my estimation is the larger mains and larger pilots. One size up in pilots is huge from a relative fuel perspective and effectively he is up two sizes in mains from optimal because one size lower mains is typical and legit at elevations the boys were runnng at. Even when pilot screws are adjusted for correct idle with larger pilots, they still will draw more fuel than stock when all the small holes around the butterfly are exposed at higher throttle.

                          Thicker air will burn that richer mixture, but a constantly higher fuel input from the larger pilots along with larger mains at high elevation (when you technically could run a size smaller than stock like I do on the 80SG) has you pig rich. The dark plug is coincidental from whatever oil control issue that cylinder is having.

                          I catch a lot of crap and good natured ribbing from guys about the 80SG running 107.5 mains, and perfect plug color even at the top of Pikes Peak at 14,110' elevation (right, 3Phase, motoman and CZ?) , but it is because that is what works for good tuning at higher elevation.
                          Howard

                          ZRX1200

                          BTW, ZRX carbs have the same spacing as the XS11... http://www.xs11.com/forum/showthread.php?t=35462

                          Comment


                          • #58
                            Yep, Howard, I didn't know Greg had supersized the mains and pilots but there's still something double-plus-ungood going on because that #4 plug was whiter than bone white and that's lean, not rich.


                            Pike's Peak was a blast! Colorado still owes me for all the 'skeeter fogging I did from the campground to the 'Peak and back too.

                            .
                            -- Scott
                            _____

                            2004 ST1300A: No name... yet
                            1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
                            1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
                            1979 XS1100SF: "Bush" W.I.P.
                            1979 XS1100F: parts
                            2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk" It's DEAD, it's not just resting. It is an EX cycle.

                            Comment


                            • #59
                              White porcelain is perfect! That is, until it collects little flecks of aluminum. That's why I look for slightly rich or tan, just like most of the rest of you. Not seeing those flecks, that #4 plug looks about perfect.

                              Last edited by jetmechmarty; 05-31-2015, 10:33 AM.
                              Marty (in Mississippi)
                              XS1100SG
                              XS650SK
                              XS650SH
                              XS650G
                              XS6502F
                              XS650E

                              Comment


                              • #60
                                Originally posted by jetmechmarty View Post
                                White porcelain is perfect! That is, until it collects little flecks of aluminum. That's why I look for slightly rich or tan, just like most of the rest of you. Not seeing those flecks, that #4 plug looks about perfect.
                                Exactly.

                                But he's running the stock airbox; don't remember if he's got stock exhaust or aftermarket. With the jetting he's running it should be rich but the plugs are lean clean.

                                .
                                -- Scott
                                _____

                                2004 ST1300A: No name... yet
                                1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
                                1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
                                1979 XS1100SF: "Bush" W.I.P.
                                1979 XS1100F: parts
                                2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk" It's DEAD, it's not just resting. It is an EX cycle.

                                Comment

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