Very good advice in thread, sometimes you can overcome the light springs by legnthening the advance slots and then welding back material toward shaft side. This puts the springs in a stretch and will usually extend rpm they advance to but will also prevent advance at idle. If it isn’t enough to keep the weights in at idle and you don’t want to fight different spring weights you can tie two or three coils of spring together with safety wire. Another option is to drill advance weights to lighten, but not completely through. Use a 5/16 bit. If you take too much out by accident, you can tap hole with a 3/8-16 bottoming tap and blue loctite in a socket head Allen to put half the weight back in.
