I have a 2001 trx 250 recon and have had the main jet fall out twice now. first after i did a carb clean, it fell out after maybe ten minutes of just riding up and down the street. didnt know what was wrong at first (bogging down beyond 1/4 throttle) until i took apart the carb and noticed that it was completely unscrewed. this time i made sure it was tight and just did about 30 minutes in the woods and it happened again. same problem. is there a way to ensure this thing stays in ? is lock tight a bad idea?

thanks