I bought a 2000 Yamaha blaster the other week guy said it just needed a new spark plug and showed me a video of it running so I believed him I got a new spark plug cleaned the carb and it didn't start I then tested the power and it stops at the coil so went to the shop to have them test the coil on there machine and the coil was fine but the spark plug isn't getting spark this guy said to unhook the box on the right that's metal (not the CDI) didn't start WHATS WRONG!