You’re going to have friction trying to spin the axle, it’s a wet clutch and it has oil drag. If the weather is cold it will be worse. I set mine up with .020″ end play, .055″ air gap and .285″ spring height.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience