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backfiring/revving up to 5k rpm while idling

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  • #16
    The TCI is the 10M, we have verified that. So what would be the best long term solution? I plan to keep this for a couple years at least for learning to ride. Otherwise, if there is no solution, I might be forced to sell it, hopefully recouple what I have put into it to put towards a different motorcycle
    Hydra'82 XJ1100 Frankenbike with a '79 engine

    ~dubbed "Hydra" by a friend, because "once one problem is fixed, another rears its ugly head!"

    Comment

    • #17
      There's always a solution...

      If the ignition bits on the motor are original '79, the easiest fix is install a 2H7 TCI. Some rewiring was no doubt done to mash the two types together, you'll have to sort that out. While the same plugs were used for both units, the wire pinouts aren't all the same.

      If that's what you have ('79 parts on the motor, 10M TCI), you're getting a double-dose of ignition advance. The '78-80 bikes have mechanical advance and the '81-up bikes had that built into the TCI instead of on the motor...
      Fast, Cheap, Reliable... Pick any two

      '78E original owner - resto project
      '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
      '82 XJ rebuild project
      '80SG restified, red SOLD
      '79F parts...
      '81H more parts...

      Other current bikes:
      '93 XL1200 Anniversary Sportster 85RWHP
      '86 XL883/1200 Chopper
      '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
      Cage: '13 Mustang GT/CS with a few 'custom' touches
      Yep, can't leave nuthin' alone...

      Comment

      • #18
        pull the timing cover off and post a picture of what is under it on here. We will tell you what you hav.
        Nathan
        KD9ARL

        μολὼν λαβέ

        1978 XS1100E
        K&N Filter
        #45 pilot Jet, #137.5 Main Jet
        OEM Exhaust
        ATK Fork Brace
        LED Dash lights
        Ammeter, Oil Pressure, Oil Temp, and Volt Meters
        Green Monster Coils
        SS Brake Lines
        Vision 550 Auto Tensioner

        In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

        Theodore Roosevelt

        Comment

        • #19
          Originally posted by crazy steve View Post
          There's always a solution...



          If that's what you have ('79 parts on the motor, 10M TCI), you're getting a double-dose of ignition advance. The '78-80 bikes have mechanical advance and the '81-up bikes had that built into the TCI instead of on the motor...
          That was my initial point in my thread way back to the start of his dileama.......but too many were bent on bustin' chops....and turned out to be exactly the case by the original explanation, so........ it is what it is....
          Last edited by motoman; 07-06-2012, 03:21 PM.
          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

          • #20
            Couple dumb questions, I searched the internet as well as online manuals and couldn't find answers to either. Feel ignorant for asking.

            The TCI is the blackbox under the seat labeled ignition Unit? I believe that is what my buddy got the 10M off of.

            What does TCI stand for?
            Hydra'82 XJ1100 Frankenbike with a '79 engine

            ~dubbed "Hydra" by a friend, because "once one problem is fixed, another rears its ugly head!"

            Comment

            • #21
              Transistor Controlled Ignition

              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

              • #22
                Originally posted by pbaker27 View Post
                The TCI is the blackbox under the seat labeled ignition Unit? I believe that is what my buddy got the 10M off of.

                What does TCI stand for?
                Yes, and Transistor Controlled Ignition...
                Fast, Cheap, Reliable... Pick any two

                '78E original owner - resto project
                '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
                '82 XJ rebuild project
                '80SG restified, red SOLD
                '79F parts...
                '81H more parts...

                Other current bikes:
                '93 XL1200 Anniversary Sportster 85RWHP
                '86 XL883/1200 Chopper
                '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
                Cage: '13 Mustang GT/CS with a few 'custom' touches
                Yep, can't leave nuthin' alone...

                Comment

                • #23
                  Can't believe I typed faster than Less Than Sane Steve for once!


                  Hehe

                  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

                  • #24
                    So, plugged in the 2H7 TCI with dissapointing results. Not only did it backfire, but it wouldn't even start. I connected the 10M TCI back up and it started right up with no backfiring, though it did start revving up to 5k rpm again. At this point I don't know what else to do and frustrated, I just want to ride, and have sunk $900 into the bike so far. Should have just spent the money on a fully running bike
                    Hydra'82 XJ1100 Frankenbike with a '79 engine

                    ~dubbed "Hydra" by a friend, because "once one problem is fixed, another rears its ugly head!"

                    Comment

                    • #25
                      There's a couple of thing going on.... First, are your sure the bike still has the '79 ignition? Does it look like this?



                      If it does, that's the original XJ ignition. If it does look different, then there's been some rewiring done that you'll have to 'undo' to make the 2H7 TCI work. Look here: http://www.xs11.com/forum/showthread.php?t=37294

                      While the various ignition boxes all look more or less the same, the terminals don't all go the same places.
                      Fast, Cheap, Reliable... Pick any two

                      '78E original owner - resto project
                      '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
                      '82 XJ rebuild project
                      '80SG restified, red SOLD
                      '79F parts...
                      '81H more parts...

                      Other current bikes:
                      '93 XL1200 Anniversary Sportster 85RWHP
                      '86 XL883/1200 Chopper
                      '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
                      Cage: '13 Mustang GT/CS with a few 'custom' touches
                      Yep, can't leave nuthin' alone...

                      Comment

                      • #26
                        That I don't know. I won't be home the next two nights till late, and my buddy the mechanic won't be able to stop over till the 28th. Where on the engine is that? I can try and take a look myself, i have worked on cars since I was 15(20+ years) yet motorcycles make me kinda gun shy with the mechanics and I don't know why.
                        Hydra'82 XJ1100 Frankenbike with a '79 engine

                        ~dubbed "Hydra" by a friend, because "once one problem is fixed, another rears its ugly head!"

                        Comment

                        • #27
                          The cover on the left side of the engine has 4 Allen head bolts. Take those bolts off (dont worry about the gasket that might be there, it isn't needed anyways) and the cover comes off. Under that cover is where you need to look to see what ignition it has. Compare it to that pic.
                          Nathan
                          KD9ARL

                          μολὼν λαβέ

                          1978 XS1100E
                          K&N Filter
                          #45 pilot Jet, #137.5 Main Jet
                          OEM Exhaust
                          ATK Fork Brace
                          LED Dash lights
                          Ammeter, Oil Pressure, Oil Temp, and Volt Meters
                          Green Monster Coils
                          SS Brake Lines
                          Vision 550 Auto Tensioner

                          In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

                          Theodore Roosevelt

                          Comment

                          • #28
                            Ok, thanks, I will do that Thursday night and try to get a picture posted.
                            Hydra'82 XJ1100 Frankenbike with a '79 engine

                            ~dubbed "Hydra" by a friend, because "once one problem is fixed, another rears its ugly head!"

                            Comment

                            • #29
                              Ok, so my night ended up freeing up so here is what I got:


                              And here is another wire that goes under the cover not sure if it is supposed to be there.
                              Hydra'82 XJ1100 Frankenbike with a '79 engine

                              ~dubbed "Hydra" by a friend, because "once one problem is fixed, another rears its ugly head!"

                              Comment

                              • #30
                                Also, put half a can of seafoam and a couple gallons of gas in and ran it for 5 minutes, it only revved up to 2k rpm without backing off. Though it was still backfiring, I shut it off before the cops got called on me.

                                And since I never posted a picture of it:
                                Hydra'82 XJ1100 Frankenbike with a '79 engine

                                ~dubbed "Hydra" by a friend, because "once one problem is fixed, another rears its ugly head!"

                                Comment

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