Having the relative timing between the two cylinders exactly the same is not the only purpose of an electronic ignition. The PAMCO was designed as a low cost replacement for the points and as such it offers a number of features and benefits , among them reliability, hotter spark for easier starting and better performance and better gas mileage as well as the elimination of routine maintenance other than the mechanical advancer.
The PAMCO still has some of the limitations of points, however, commensurate with it's low cost, among them is the possibility of frying the coils if you leave the ignition on with the engine not running, as an example and it still uses the mechanical advancer.
Although you can spend a lot of time adjusting points to achieve near perfect timing with both cylinders, this perfection does not last very long as you have probably discovered. Although it is not easy to set the individual timing for each cylinder with the PAMCO, it can be done by gently bending the sensor up on the late (retarded) cylinder. Whatever degree of sameness that you achieve with the PAMCO timing of both cylinders, it will not change, so that is an advantage over points.
I have a '74 CB750F-4 and it has a PAMCO (of course) and the timing between the cylinders is not the same. I have made no attempt to adjust it either. It just doesn't make any difference in the operation of the engine and I have had it that way for a few years. When I offered this opinion on the forum, I was accused of being arrogant. Well, arrogance generally means that you have not experienced what the other person is talking about, but I have and I do not think it is a problem from my own actual experience riding the same model of bike as the members.
Keep in mind that the factory recommended method of timing the ignition is the static method using a test light! The factory thinks that method of timing and the resulting very different timing for the two cylinders is acceptable.
I also offer ignition systems for other models of Honda, including the CB450, CB350 and CB360 twins. I have just recently introduced a new product for these models that eliminates the mechanical advancer and has separate adjustable sensors for each cylinder. You can see this system on
www.cb450ignition.com I might then go ahead and build a system like this for the CB750 SOHC if there was any interest. I haven't done so yet because I personally do not see the need for it on the CB750 SOHC. (more arrogance!) The other Honda twins had other issues with their advancer, so the new system eliminates the advancer.
This new system for those Honda twins is $189.95. I don't think you can find another electronic ignition system for vintage Hondas for that price that has individual adjustable timing and electronic advance as well as a software automatic kill switch as well as some retardation of the spark at very slow engine speeds for easier starts and less dramatic kick starting.
