Thanks all for the replies!
As far as the experimenting w/ pulley size question, what I really am looking at accomplishing is to lower the 130K btu/hr output some.
So, the fan speed is where I was looking to change. The auger tube/ashing side I was thinking of just letting it be.
My thinking is there should surely be some *wiggle room* for speed adjustment when it comes to fan air, as any variety of pea coal from the many different breakers would allow a different volumes of air to be pulled through the fire pot.
Axeman, I'm sure, did their best to be able to consistently achieve the advertised 130K output w/ the variety of pea coal from different breakers. I only want to take the output down...that should not be reinventing the wheel.
More air = more heat (within certain limits)
Less air = less heat (within certain limits)
If I could obtain...say...100K BTU/HR, I'd be happy.