Hello, i have a Tank sporty 50 and i rode some one a little too heavy on it with me, and it drove ok, but when i got home and let it set a while, when i took off on it again it did this weird thing where if you pull down on the accelerator/throttle to fast it would spurt and not pull the bike. i dont know what it could be so if anybody has any ideas on how to maybe fix it i would appreciate it verrry much.