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The older (points) ignition has a mechanical advance setup, but the newer electronic ignition (TCI) used an electronic advance system. The newer Pamco system uses electronic advance, so the new Pamco system includes the (magic) box, two electronic pickups, and a rotor. Everything that you'll...

Thank you for correcting me on that. I was actually going to suggest contacting Pamco directly at first, but I had the Mikes link saved and forgot to check that it was for the newer ignition before I posted. I'm glad that you caught that. ....Paul

Here ya go, Mikes XS is handling them now. Should be everything you need. https://www.mikesxs.net/yamaha-xs650-pamco-ignition-for-the-xs400.html .....Paul

I've had a few days to ride the bike with the new advancer and it's been running great. It seems to have a little more power on the top end with the new chip, probably related to the increased timing. Also, a slight correction, I said that the new system with the E-advancer was for the models...

I believe Pete will be offering his ignition with his E-advancer very soon for the bikes that are using the oem TCI (80 and up). I just finished installing his new advance chip that was designed for the XS400. I've been running his system with a CB360 chip for about a month, but he has a new...

Base timing can be changed by rotating the mounting plate just as is done on the OEM, but the advance curve and total advance can only be changed by Pete using his electronics magic. .....Paul

I've been working (well, not really) with Pete (Pamco) on his new e-advancer ignition for the XS400. I installed his beta advancer and have put about 100 miles on it so far. The bike's running great and starts on the first kick. He wants to tweak the total advance a bit, but even as it is, it...

Did you try checking the ignition timing with a timing light while the engine is cranking? ...........Paul

Just to wrap up this thread, I found another TCI and installed it yesterday. The bike seems to be running fine.... no more miss when accelerating. I took it for a 15 mile ride so far and all is good. I did open up the old TCI and inspected the components and solder joints, everything looked...

According to Haynes manual the timing is 10 degrees at idle and 36 degrees advanced. The "LF" is 10 degrees and for the left cylinder. ........Paul

Pete, Thank you very much for taking the time to find the old post about using an early advancer with your system. Advancers are readily available and relatively inexpensive, but I believe a price of $189.00 is a very reasonable price for a complete electronic setup. A used TCI is anywhere...

Pete, Thank you for the reply. I looked at your instructions for the 400 ignition, but wasn't aware that the advancer from the older models would fit. I searched the forum for info on installing your ignition, but I guess I missed it. I may be contacting you in the near future if I can find the...

I would consider a unit from Pete, but the ones that he makes for the 400 are for the early models with points and mechanical advance as you said. I used one of Pete's units on an 81 xs650 to replace a bad TCI, but I had to install a mechanical advance from an earlier model. Right after I did...

Thank you for the reply Dave. Today I took the cover off of the TCI and from what I see there is no sign of overheated/burned components or corroded solder joints. Just for information sake, I found out that the left cylinder is controlled by the pickup sensor that is at the 12 o'clock position...

....The coil resistance is within spec when tested cold (70 degrees) and hot (120 degrees) The coils were swapped side to side and the miss stayed on the same connector (red/white and gray wires) The pickup resistance was tested cold and warm and are within published specs (700+/-150)...

Hello, My name is Paul and this is my first post. I've been riding (legally) for 45 years and working on bikes longer. I currently own 9 bikes of varied breed, but my current project is a 1980 XS400. My concern is an intermittent off idle miss that occurs after 5 minutes of run time and...