2001 rm125 problems
 

So i just got a 2001 rm125, I rode it for one day and it was perfect. It started on one kick. But the second time i rode it I shifted into second and a few seconds later it started to die on me :mad:. I thought it was the gas but it still didn't start after putting premixed gas in it. The compression is good but it still doesn't start. I have also checked the airfilter which is good. I dont know what else to do. If you know any solutions to this please message me.
Thanks