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A motorcycle jerk or backfire can come from the choke not shutting off completely, the fuel jets might be clogged, a gasket or seal may be broken. Valves that are out of adjustment could also be the problem.
No, only use the choke until the bike can idle without it
choke, throttle, jet
Your 2003 Suzuki 125 motorcycle does have an automatic choke. The 2003 Suzuki was not equipped with a manual choke.
Off, it will not run properly with the choke on, the mixture will be too rich.
Carburetor not adjusted correctly
The choke changes the mix of fuel and air entering the motorcycle's engine by reducing airflow. The richer fuel mixture burns more easily in a cold engine, but at the same time can strip away lubricating oil. As a result, you should leave the choke on for the minimum amount of time possible until your bike is warmed up.
could be that the choke is not adjusted right
Both shotguns and cars have chokes. How they are adjusted depends of the particular shotgun or engine- we need more info to give you a real answer.
Nothing realy.. with the choke on the engine receives more fuel making it easier to run with a cold motor. after starting the engine, wait about two minutes before turning it off.
he doesnt know any better
The pilot jet is clogged, get a new one or clean it very well, add fresh gas and go...but you might need to clean the carb some.