For what it's worth, here's what we've used to win virtually every major Stock On Road and Oval race for the past year:
#EFB-180: Green shunt brush +, Blue shunt brush - with trailing edges removed
-Once hoods are properly aligned, Break in @ 2 volts for 400 seconds with a fan on the pinion shaft. Use 3-4 drops of Zubak drops in each hood during break in. After break in is complete, leave brushes and springs in tact and flush out comm and endbell with motor spray / electrical cleaner. (
Never use Brake Cleaner or Carb and Choke Cleaner.) Let air dry, motor is ready to race.
Springs:
1/12: Putnam Green 7.0 oz.
1/10: Putnam Red 7.5 oz.
If more bottom end is needed, replace the red spring with a Putnam Purple spring (9.0 oz.) on the positive pole. If still more is needed, or your motor fades late in the run due to heat/brush glaze, replace the red spring on the negative pole with a purple as well.
Hope this helps,
Todd Putnam
Putnam Propulsion
www.putnampropulsion.com
518-452-0422