Hell. I’ve been building my gen1 10r for about a year not and I assembled the bike and up until today I haven’t had any issues with bike starting. I ran it for about an hour at idle last week but today it started then backfired and proceeded to shut down it started one more time with throttle but not for long maybe 5-10 seconds at very low rpm. I don’t hear it popping off almost like it lost spark. What can make it loose spark? Thank I’m advance.