Thanks for the pointers, a high and a low limit makes sense, maybe this can be narrowed down. original problem could have been a ground issue. There is a lot of varnish on these magnitoes, and probably a good idea to sand it off with a emory board and put dielectric gress on it to make sure it grounds good. please someone remind me that these magnitos are directional and the business card trick. Bike is now running fine. I replaced the plug with cj7y Champion, and replaced the plug wire with 7mm autozone