To add to Dslater's comment(Which is VERY good!)I dont know what model tractor your distributor goes in,so I will use an "M" as an example:
These are LOW rpm engines.So,If the MAXIMUM rpms were 1500(just using 1500 as an example!!!!),the distributor is only turning 750 rpm at the VERY most. In the world of distributors,this aint much.
You are trying to achieve full mechanical advance of the distributor at Wide Open throttle.The fly weights in the distributor are limited to how far they can go because they will bottom out against a stop inside the distributor.Anything under that can be changed by changing the weight/tension of those springs.This will affect your power curve under the maximum rpms.
In other words,lighter spring tensions will allow full advance at lower rpms,higher tensions will require MORE rpms to gain full advance.
Like previously posted,on a distributor machine you can actually "tune" this to taylor it to your likings.I dont know what you are doing with this tractor,but on a "stock tractor" this is really not to critical.If you are a "puller",it could help to gain some more "low end' in your engine.
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