This post is important for owners that are not getting the best performance for their cb750. And the ignition system is a make or break system that will shorten engine life and increased parts and labor. One thing for sure is the replacement points and condenser for these older classics are or very poor quality. And this is because most of them are not OEM replacement and are made as a aftermarket. What I did not long ago was to install a dyna electronic ignition system designed for the cb750. They are very reliable and don't need to adjusted, once set and it keeps timing where it needs to be at all RPMs with the help of the advance unit. The trouble with points over time they get burned on the contacts and this causes incorrect timing. You can have the contacts burned on cylinders 1 and 4 and the contacts on 2 and 3 spot on. That will cause a unstable running engine that will shorten engine life. With a electronic ignition there are no points to wear out and condensers to burn out. Just remember to adjust your timing chain prior upgrading to elec. ignition. This will allow your engine to perform like it was intended.