There's bound to be lots of different opinions on this, but here's my 2 cents:
Originally Posted by Fervidsea
With CO27s is there a set amp draw for the motor that makes it bad good or great... IE under 5 is junk 5 to 8 is ok and above 8 is great?
Not really - it's very hard to determine this from amp draw alone. You are best off buying a motor from a reputable tuner, and they should take care of this for you by discarding any duds.
Originally Posted by Fervidsea
When is a brush done? IE when the serations are gone? or do you just re do them? Or is it when the bush is only so long?
If the brush is not burned or discoloured, you can re-serrate the brush and break it in again. Most people don't go to this trouble because a lot of good performing brushes aren't that expensive.
Originally Posted by Fervidsea
Is there a website or can someone post some pics, kinda like a users guide for brushes in general. For more RPM cut the brush like this (with picture) type.
There might be something like this out there, but it's generally a lot more complex than that. The different brush cuts are going to differ a lot depending on the motor and brush they are being used on. There are a few basics like the timed cut, but the others are pretty subjective.
Originally Posted by Fervidsea
When, by size is the com no longe good or to small... so many cuts or is there a mesurement?
0.270" is generally the minimum size on a normal sized comm. Beyond that, the copper is pretty thin and may peel back while you are cutting.