1 - 2 seconds of choke is enough. The purpose of Choke is simply put, to PUSH Fuel to help in cold start. Thats all.
Flip the choke up, kick/self start, and when the bike does start, flip it back down.
There is another way to start bike in Cold Weather, and i think its a better way.
- Keep the Ignition Switch OFF.
- Kick 4 - 5 times (with swtich off)
- Turn Ignition Switch ON
- Kick start
It helps regulate the Mobile Oil inside the engine so the bike starts easily.