Leave the weights alone. In your setup and needs, they'll do little more than hurt your gas mileage.
I believe your machine will take 2mm. Just make sure you have spline showing when your reinstall the primary.Or would 2mm shim and purple spring be better?
Yes. You can do up to 2.0mm on a 660.Could I do a 1.7mm shim on a 660?
Only with a belt worn close to the wear limits. A new belt will not rub the case at 2.0mm on a 660.Will a 2mm shim make the belt rub on the case?
I use 3 shims to get to 2.5 mm's, 2) 1 mm shims and a .5 mm shim.Is it ok to put 3 shims? I have a 1mm,.5mm,and a .2mm.
I don't remember how much top end speed was lost, but I solved that by cutting the cam plate and resetting the angle.How much top end did you lose using 2.5mm? I want to go 2mm but don't want belt to rub. What happens when belt rubs?