Question about 1976 Yamaha XS 500

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Tt500 wireing First, Thankyou so much for your input,however i have only one wire comeing off the coil (no negative) two from the generator and one from the points. Any suggestions?

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I have edited the picture to show what to do.

  1. The power wire from the generator is wired to the points wire.
  2. The points wire and generator wire are wire to the coil +
  3. The coil is frame grounded when mounted.

Note:You may need to try each of the 2 wires from the generator(try one and if it doesn't run or run right,try the other wire,Since the energize at different times)

tt500 wireing - 57f2415.jpg

Posted on Jan 26, 2009

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The 2006 carbureted models have a three wire 83B connector with #3 wire being BE/O Front coil wire carrying the primary current supplied from the #2 W/BK wire to and through the front coil primary circuit to the ECM (#2 wire being W/BK and supplying current from the Stop Run Switch to both front and rear coil primary circuits at the same time) and the #1 wire being Y/BE Rear coil wire carrying primary current supplied through the W/BK wire to and through the rear primary wire #1 to the ECM. So, current comes to both coil segments (front and rear) simultaneously, passing both primary windings by two separate wires to ground through/in the ECM until the ECM opens each circuit independently of the other and thereby collapse the current in each primary winding into each secondary winding at the appropriate time to fire the respective spark plug.

The 2006 EFI models have a four wire 83B connector with wire "A" being Y/GN Power supply wire; wire "B" being GY/BE and the ION sense wire to the ECM; wire "C" being Y/BE Rear primary coil segment and Wire "D" being BE/O Front primary coil segment. Again current comes to the coil through the Y/GN "A" wire and passes through the front primary circuit to the ECM via the BE/O wire until the ECM opens the circuit which collapses the front coil primary current into the front coil secondary circuit inducing a high voltage current which then bridges the gap and fires the front spark plug and through the rear coil segment primary circuit to the ECM via the Y/BE wire until the ECM opens the circuit which collapses the rear primary current into the rear secondary circuit inducing a high voltage current which then bridges the gap and fires the rear cylinder spark plug.

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It will be the brown wire.

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http://forums.atvconnection.com/attachments/kawasaki/1474d1253468289-wiring-diagram-1987-bayou-klf-300-bayou300awddiagram_1.jpg

The start relay can also be the problem.....
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Contact points cover open.

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Right side points are for cylinders 2 and 3

Left side points have a White wire coming from it.
Right side points have a Black wire coming from it.

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One coil runs cylinders 1 and 4.
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No matter what style of ignition coil you use, the Black wire will connect to the Points. Whatever other color of wire they use, connects to the ignition switch.

BUT, check the specifications for the coils you're going to install. Connect the Negative side to the points. The Positive side to the ignition switch.

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Tt500


Glad I could help.

Please rate this fixya

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Yamaha tt500 wiring


This should do it for you and please rate this solution when you can.
db6ebac.jpg

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