PAMCO Hall Effect Ignition for the XS650

Rev 1.6



The PAMCO Hall Effect Ignition system is a direct replacement for the points plate and points cam system on a Yamaha XS650. It can also be installed in later models of the XS650 that have a factory TCI system by installing the complete mechanical advance mechanism.

The system requires the use of a dual output coil. The stock coil in the TCI equipped models may be retained when installing this system.

Note: Use either resistor spark plugs or 5K resistor spark plug caps.


Technology: Hall effect sensor, IGBT coil driver

Dwell: Fixed, 60 degrees
Coil primary resistance: 2 to 3 Ohms, dual output.
Operating voltage: 6 to 18 VDC
Operating current: 13 ma
Operating Temperature: -40 to +150C (-40 to 302F)
Spark Advance: Standard, centrifugal

Installing on a '80 to '84 requires the installation of the centrifugal advance system and cam bushings or the PAMCO E-Advancer, advance rod and bushings.



1 Do not apply power until the installation is complete.

2 Do not apply power unless both spark plugs are connected.

  1. Do not test for spark with one or both plugs disconnected.
  2. Do not disconnect battery with engine running.
  3. Ensure that the battery cable connections are secure.
  4. Do not leave the ignition on when engine is not running.
  5. Do not use MikesXS  part number 17-6810 ("Green Monster") coil. Use of this coil will void the warranty.
  6. Leave the spark plugs installed in the engine while doing this installation to prevent small parts from falling into the cylinders.

Failure to follow these cautions may damage the system and render it inoperative and void the warranty.

It is recommended that the advance rod and centrifugal unit be serviced prior to installing this system.

  1. Remove the gas tank.
  2. Remove the two ignition coils and condensers in a 71 to 79 model.
  3. Disconnect the plug from the TCI on a 80 to 84 model.
  4. Install a suitable dual output coil, or use the stock coil on 80 to 83 models.
  5. Connect the Red/White wire from the wiring harness (switched battery) to either terminal on the coil.
  6. Remove the points cam, points plate, points, condenser and wiring.
  7. Install the PAMCO replacement plate with the two hold down screws.
  8. Route the wiring harness from the replacement plate to coil.
  9. Connect the wires from the harness :
  10. Red wire to battery connection on coil. Or to other Red / White wire
  11. Green wire to the other coil terminal
  12. No other wires should be connected to the green wire terminal.
  13. Black wire to a good frame ground.
  14. Note: You must ground the black wire to a good frame ground. The ground on the plate is not reliable while setting the timing.


  15. Install the "rotor" on the advance rod shaft.
  16. Install the large washer and nut with the lock washer.


16. Hold the rotor firmly to the right (clockwise) when tightening the nut on the shaft.

17. Hold the nut on the advance mechanism firmly when tightening the nut on the "rotor".

18. Remove the access cover to the alternator.

Reinstall the gas tank and proceed as follows to set the timing. A strobe type timing light is required to set the timing.

  1. Loosen the hold down screws on the plate.
  2. Rotate the plate to position the hold down screws at the mid point of the upper slot.
  3. Tighten the upper hold down screw.
  4. Connect the timing light. Note that with a dual output coil, some timing lights may be erratic due to the fact that there are opposite "polarities" in the plug wires. If the timing light is erratic, then clip on to the opposite plug.
  5. Start the engine and immediately shine the beam on the timing mark on the alternator rotor.
  6. The strobe should illuminate the timing mark when it is between the two marks labeled "F".
  7. If necessary, loosen the hold down screw on the plate and rotate the plate clockwise to advance the timing and counter clockwise to retard the timing.
  8. Tighten both hold down screws securing the plate.

For additional technical assistance:

Additional instructions also available at:

Testing Procedure: Click Here