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Possible option for factory coil replacement?

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  • #1

    Possible option for factory coil replacement?

    Was looking around JP Cycles last night and found these coils:

    http://www.jpcycles.com/product/382-000

    They look like they could be a good swap for the factory coils. They mount with the same orientation.

    Granted I am a new owner, so I may not know all the variables, but thought I would throw this out for more experienced owners to evaluate as an option.
    81 BasketCase
    Tags: None
  • #2
    I checked these out a while ago and contacted Dyna about these. Unfortunately, these won't work with the XS ignition as it lacks 'dwell control' (electronically controlling the 'on' time) and they'll burn up. Swap to a modern aftermarket control box and you can use them, but now you're talking big $$$...
    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

    • #3
      I see, thanks for the info.

      So I guess I just have to decide between the Dyna green coils and the Accel coils.

      Either way, I have to decide whether to go with the 1.5 ohm coils and keep the ballast resistor or go with the 3 ohm coils and remove the ballast resistor.

      After reading multiple posts on the aftermarket coils, I still can't find a definitive answer whether pulling the ballast resistor and going the 3 ohm coil route will harm the TCI box or not. Guess I will just have to keep digging.

      Love having so much knowledge in one place. Now I just need to work on making a contribution in return.
      81 BasketCase

      Comment

      • #4
        Originally posted by GhostWolf View Post
        I see, thanks for the info.

        So I guess I just have to decide between the Dyna green coils and the Accel coils.

        Either way, I have to decide whether to go with the 1.5 ohm coils and keep the ballast resistor or go with the 3 ohm coils and remove the ballast resistor.

        After reading multiple posts on the aftermarket coils, I still can't find a definitive answer whether pulling the ballast resistor and going the 3 ohm coil route will harm the TCI box or not. Guess I will just have to keep digging.

        Love having so much knowledge in one place. Now I just need to work on making a contribution in return.
        The TCI doesn't care it it sees 3 ohms from the coils or 1.5 from the coils plus 1.5 from the balast resistor. Personally I would ditch the resistor and go with 3.0 ohm coils. The resistor is just another unnecessary passive component that can fail and cause headaches...
        '79 XS11 F
        Stock except K&N

        '79 XS11 SF
        Stock, no title.

        '84 Chevy K-10 "Big Blue"
        GM 350, Muncie SM465, NP208, GM 10 Bolt with 3.42gears turnin 31x10.5 Baja Claws

        "What they do have is an implacable, unrelenting presence and movement that bespeaks massive power lurking behind paint and chrome. They don't wail like a screeching ninja, the don't rumble like a harley. They just growl like a spactic, stressed out badger waiting to rip your face off and eat your soul." Trainzz~RIP~

        Comment

        • #5
          Originally posted by GhostWolf View Post
          Either way, I have to decide whether to go with the 1.5 ohm coils and keep the ballast resistor or go with the 3 ohm coils and remove the ballast resistor..
          Ditch the resistor and go with the 3 ohm units. Those will have a hotter spark without the resistor compared to the 1.5 ohm units with one under normal running conditions...
          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

          • #6
            It really only makes sence to go with 3 ohm coils. The ballast resistor fail over time so you may as well get rid of it now.

            Get the DC-1 3 ohm could if you go with dynatek
            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

            • #7
              I just switched to the Dyna a few weeks ago, 3 Ohms . I had the green "MikesXS" coils on before they crapped out. The difference is amazing. Excellent throttle response and about 4 more mile to the gallon to boot!!!
              BDF Special
              80SG Vetter bagger 1196 Wiseco big bore kit, Mega Cycle Cams, slotted cam gears, ported and flowed head, bronze intake seats, Dyno Jet kit, Dyno coils and Mikes XS air pods, Venture cam chain adjuster,Geezer's regulator, Clutch mod, Mac 4 into 1 with custom built and tuned baffle, Oil cooler,MikesXS emulators mod.
              Dyno tuned to 98 hp at the rear wheel.

              Comment

              • #8
                Thanks to everyone for the advice. I plan on ordering the Dyna coils once I get paid on Friday.
                81 BasketCase

                Comment

                • #9
                  Good move. I use green Dyna coils. I ditched the ballast resistor and never had any problems. The coils improved performance noticeably.

                  Here's how they fit. You need to use a couple of small L brackets per coil, I think you'll find.







                  Last edited by James England; 09-25-2012, 12:08 PM.
                  XS1100F 1980 European model. Standard. Dyna coils. Iridium plugs. XS750 final drive (sometimes). Micron fork brace. Progressive front springs. Geezer regulator/rectifier. Stainless 4 into 2 exhaust. Auto CCT (Venturer 1300) SOLD. New project now on the go. 1980 European model.

                  Comment

                  • #10
                    Ditto Dyna

                    Yep, ditto here for the 3 ohm Dyna coils. Used their (plug) wires too. Left the OEM ballast resistor in place, but it is disconnected and unused.

                    As has been explained, the TCI (ignition) module is looking for 3 ohms resistance. It does not care how it gets it. From the factory it gets....1.5 coils + 1.5 ballast resistor = 3 ohms. The Dynas are 3 ohms by themselves, no need to add another 1.5 with the (ballast) resistor. So, toss it or leave it unhooked and put the 2 wires going to it (from TCI) together to complete that circuit.

                    A little fabrication is needed to mount them, but no big deal - you have to make some angle brackets to clock the coils 90 degrees (down).

                    But they do work well. I like them enough to buy another set for bike # 2 eventually.

                    MP
                    1981 XS1100H Venturer
                    K&N Air Filter
                    ACCT
                    Custom Paint by Deitz
                    Geezer Rectifier/Regulator
                    Chacal Stainless Steel Braided Brake Lines
                    Chrome Front Rotor & Caliper Covers
                    Stebel Nautilus Horn
                    EBC Front Rotors
                    Limie Accent Moves On In 2015

                    Mike

                    Comment

                    • #11
                      I know it is on here somewhere but could we get a link that we could order from. Thanks.
                      Jeff
                      77 XS750 2D completely stock
                      79 SF XS1100 "Picky" stock with harley mufflers

                      Comment

                      • #12
                        Just Google dynatek DC-1 coils and take your pic of vendors.
                        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

                        • #13
                          More on coils

                          When I fired up Yami my 78 XS11 Special this morning, it ran on the two left cylinders but not the two right hand cylinders.
                          I assumed that one of the coils has failed, assuming that one coil provides zap for two cylinders.
                          If the above is correct I hear you saying that the Dyna coils work well.
                          Can you tell me where to buy them?
                          Thank you. Unkle Crusty

                          Comment

                          • #14
                            Originally posted by Crusty Snippets View Post
                            When I fired up Yami my 78 XS11 Special this morning, it ran on the two left cylinders but not the two right hand cylinders.
                            I assumed that one of the coils has failed, assuming that one coil provides zap for two cylinders.
                            If the above is correct I hear you saying that the Dyna coils work well.
                            Can you tell me where to buy them?
                            Thank you. Unkle Crusty
                            Aww, Unk, you're just caught up in the current coil craze. The left coil sparks 1 and 4, the right coil sparks 2 and 3, so if the two right cylinders are dead, that means that the fuel delivery to them is suspect. Go check the petcocks, or your fuel level, and if it is low, check your crankcase oil level. CZ

                            Comment

                            • #15
                              Dopey me.

                              Too many bikes. The others turn on the fuel magically.
                              Yami, which is actually a 79, requires the left and right side fuel taps
                              ( petcocks ) to be turned on. I had failed to turn on the right hand one.
                              To be sure I will fire him again tomorrow morning.
                              I am in the middle of working on the front brakes.
                              Thank you for the information.
                              Unkle Crusty

                              Comment

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