Today is not my day...more issues

[Frank Castle]

Hi
as you guys know, i changed my carb for a new one and also changed my fuel line. my hard start issue stopped so the hard start was cause of the carb. i was having idle issues but i managed to fix it. so after 2 days of enjoying my scooter with the new upgrades, all of a sudden my scooter does not want to stay on, when i let go of the throttle it stops? and not only that sometimes when i start my scoot there is a really loud metal on metal grinding noise for like a second, i think its the starter, i think i want to shoot myself now, 2 problems back to back

by the way,
* i checked all the hoses for holes
* checked to see if the plug was plugged
* cant be my fuel pump cause i can see it working with my transparent fuel line,
* its not the fuel filter, carb or fuel line (all new)
* played with the mixture and idle but nothing happened