I am not a tech savy on motorcycle and I have a question for all you motorcycle experts or tech savy.

I have a 99 CBR900RR and I always had to pull the choke everytime I need to start my bike especially when the bike is cold. Once the bike is warm (over 100degrees) then I can close/shut the choke. I also don't need to pull the choke when I am starting my bike when it is still warm. I never had any problems starting my bike but I have always been curious why I have to pull the choke everytime I start it cold.

Is that normal? Is that normal for carburated type motorcycles to pull the choke every time you start it (when engine is cold or have not started in over 2 hours). I know fuel injected don't have choke and you just start it and ride it. But most carburated bikes I know they will have to choke it, let the engine warm up then go.

I just wanted to make sure that nothing is wrong with my bike. Thanks for all your input.

 

I'm not an expert too but I can say your bike is perfectly normal!

The choke purpose is to restrict the flow of air, thereby enriching the fuel-air mixture while starting the engine. By restricting the flow of air into the throat of the carburetor, the choke valve raises the level of vacuum inside the throat, which causes a proportionally greater amount of fuel to be sucked out of the main jet and into the combustion chamber during cold-running operation.

 

+1........normal. Even FI bikes need a little help out of bed on a cold morning......they get a fast idle circuit by either a lever on old models or a servo motor on newer ones.

 

After a reply like that, how can you say that you are not an expert?

Great reply!!