hacker b20 15l pinion question

[pey]

hello everyone
just got a hacker b20 15l. Anyone using it? what pinion are you using?
I´ve heard you need 9t pinion to keep motor cool. By the way, anyone using governor mode(constant rpm) how do you program rpm´s? thanx

[ehaga]

After modification to belt drive, I also upgraded to Hacker b20 15l. Still needed some more power, so I change to a 9 pinion. No problem with heat.