Installing the PAMCO CB750, CB550, CB500 Four, CB400F and CB350F Ignitions

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Edmund Wheeler
5 years ago
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1 Installing the PAMCO CB750, CB550, CB500 Four, CB400F and CB350F Ignitions Section A Removing the Existing Points Plate a1. Remove the points plate and advance mechanism. Follow the instructions in your service manual. a2. Remove the points cam from the advance mechanism. On some advance mechanisms, the weights must be removed as the points cam has a flange on the bottom. a3. If the weights were removed in step a2, reinstall them. a4. Take this opportunity to apply a light coating of multipurpose grease to the advancer shaft. Section B Pin Removal (on some models) Sometimes, there is a small pin located on the shaft of the advancer. If you have this pin on your advancer, follow these instructions for removal: b1. Check for the pin. If present, grind it off with a small rotary grinding tool or a file. If necessary, clean with WD-40 to remove metal particles, then apply a light coat of oil to prevent rust. b2. Apply a light coating of multipurpose grease to the advancer shaft. b3. Bolt the rotor to the advancer, checking for free movement and complete spring return. Section C - Rotor Installation The PAMCO rotor is now installed on the advance mechanism with the PAMCO plate in between. Each advance weight must be extended to allow the slots in the PAMCO rotor to engage the small tabs on the weights.

2 c1. Place the rotor on a flat surface.

3 c2. Place the PAMCO ignition plate on the rotor.

4 c3. Hold the weights in the extended position and insert the tabs on the weights into the slots on the PAMCO rotor.

5 c4. The rotor can engage the tabs on the weights in one of two ways. This is the preferred way. c5. With the trigger magnet positioned as shown above, the green wire from the trigger on the right goes to the coil for cylinders 1 and 4 (blue wire), and the other green wire goes to the coil for cylinders 2 and 3 (yellow wire). If you assemble the rotor with 2-3 in place of 1-4 as shown, then you can either do it again, or just reverse the wires for each cylinder.

6 c6. Install the PAMCO plate and rotor in place of the points plate with the upper mounting screw in the center of its slot, as shown.

If you are installing the 17-6903 coils, remove the stock coils and the

7 Section D - Coil Installation (if installing coils at the same time) This next step requires removal of the gas tank. If you are installing the coils, remove the stock coils and the small sub brackets. Install the coils using the bolts and spacers that come with the kit like this:

8 d1. Connect the red wires from both cables of the PAMCO ignition by extension to the Black / white wire from the kill switch, which is connected to each coil. Alternatively, you could connect the red wires to another source of switched battery power, such as the rear brake light switch or regulator and thereby avoid gas tank removal. d2. Connect the black ground wire from both cables of the PAMCO to the frame. d3. Connect the green wire from one of the cables to the 1 4 coil (blue wire) located in the vicinity of the rear brake light switch connections. d4. Connect the green wire from the other cable to the 2 3 coil (yellow wire) located in the vicinity of the rear brake light switch connections. d5. You should be able to start the engine at this point. If it does not start, turn off the ignition switch and verify which set of cylinders is associated with which color wire, per steps d3 & d4, above. d6. Place a wrench on the nut that secures the PAMCO rotor and rotate the crank to position the timing marks for either the 1 4 or 2 3 cylinders. Note the position of the trigger magnet (c4, above). d7. After you have started the engine, connect a timing light to cylinder #4 and look in the hole on the top of the plate to check the timing. d8. Loosen the mounting screws for the plate. Rotate it clockwise to retard the timing or counterclockwise to advance the timing. d9. On the CB750 model only, set the timing at the "F" mark at 1000 RPM and then check for max advance at 2500 RPM. On other models, please consult your service manual for the correct timing. d10. Secure the plate-mounting screws. Your Pamco Ignition is now installed. Replace the cover and take a short ride to check for proper timing and operation throughout the rev range at operating temperature. Contact us if you have any questions or problems.

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