I got a friends bike . It’s starts runs around the block I get back to my driveway it loses power and dies.So I can start it right away again then runs 2 to 3 seconds dies.So you let it set for a couple hrs . It then will go around the block again same thing dies.Please I’m not sure but thinking magneto or coil. I’ve taken carburetor completely apart and clean it plus tried with a brand new Nt carburetor same. Hope someone has had this problem. It’s so consistent I’m going to check all wires first thing then plug and plug wire too. Plus it doesn’t really run as good as it did two weeks ago. I went riding with him and it sounded really good. Any ideas guys.