Some time Self is working fine and some time Self is making sound while getting started. The sound is something like the Self is getting stuck some where in gear. So i couldn't find out why the sound is coming and from where.??
Please let me know how to fix it.

At first get your carburator cleaned and checked.Sometimes an air filter replacement might be needed.If the carburator and air filter are fine then you should get your battery charge checked and if it's not properly charged send it for proper charging.