I bought a brand new 125 and it runs great for about 45 minutes then just won't stay running. Let it cool and you're good to go for another 45. Coil? I did a break in for about 40 minutes at idle then changed oil. Any thoughts would be greatly appreciated.

 

Id check for spark after it dies.. its either that or fuel.

 

maybe valve lash too tight ???? heat expanding and losing just enough clearance ??

 

Will it turn over after it stops?