hi

i charge the battery and runs the bike.

the bike starts well but as soon as i release the throttle engine shut down.

the rpm doesn't stay between 1-2 when i release the throttle it just jump down to 0.

i don't know much about motorcycle so please help me .. i want to ride my bike

Pilot jets are probably blocked stopping it idleing. Take them off and clean them with carb cleaner, it's not a difficult job

Agreed. You have to take the carbs off and give them a thorough cleaning.