by No side stand » Fri May 29, 2020 8:10 pm
Hi Otis. Hope you are well. If you changed the magneto, you have eliminated the idea of a loose magneto drive gear. The next gear that can spin is on the end of your cam.
Different engine but same concept. During the 90’s a guy brought in a Low rider on a trailer. He said it had been running fine and then it became hard to start…and eventually he couldn’t start it. I went through the normal timing procedure but could not get the cdi timing to align after the closing of the front inlet valve. I decided something was rotten in Denmark, and pulled the cam cover off. After re doing the timing a few times and much head scratching, found that the timing gear had spun on the cam.
You might be able to determine your problem with some fact checking…Which direction is the degree shift… Advance or retard? Is the degree shift the same amount each time?
If you miss your timing mark …. “over shoot your flywheel rotation” it is important to reverse the flywheel at least a ¼ of a rotation and then come back to the timing mark. A ¼ rotation will ensure that all the lash in the gear train will be taken out