Honda CB shine starting issue

You may be using poor fuel. Try using fuel from a different supplier.

It is normal behaviour to use the choke when starting the engine from cold. That's what a choke is for.

Choke valves are important for normally aspirated gasoline engines because small droplets of gasoline do not evaporate well within a cold engine. By restricting the flow of air into the throat of the carburetor, the choke valve reduces the pressure inside the throat, which causes a proportionally greater amount of fuel to be pushed from the main jet into the combustion chamber during cold-running operation. Once the engine is warm (from combustion), opening the choke valve restores the carburetor to normal operation, supplying fuel and air in the correct stoichiometric ratio for clean, efficient combustion.

https://en.wikipedia.org/wiki/Choke_valve

It is not uncommon to have to use the choke when starting a cold engine. The term cold is relative to an engine's normal operating temperature, not ambient conditions. Yes, ambient conditions have an effect from the stand point of the colder it is, the longer the choke may need to be engaged during warmup.

So, each time the engine cools significantly, you will need to use the choke to start it. The choke may not be needed for long, but just to assist the starting. Obviously, when the engine is still warm it may not be necessary to use the choke.

How much choke are you using to start and in what conditions? I wouldn't worry too much. My CB600F Hornet is the same, I need the choke unless I've just ridden it or if it's a warm day cold engine it needs about half choke.