I kno its a dirt bike.. but my bro needs your help. He kick starts it and it runs for like 2-4 seconds.. gives it throttle and it dies out. It does this ALL THE TIME now for some reason.. do you know why and how to fix it?

 

maby a clogged jet in the carb or it just needs to be cleaned, thats probally the most common cause for somthing like that............try cleaning the carb