I have a yamoto 70cc that was running fine but now no spark. I took the kill switch apart and it looked fine, I borrowed a cdi off a 50cc that runs fine before and after borrowing and it still had no spark. I had bought a complete electrical loom off ebay so I had a new coil to try but still no spark. I have a black box in the battery compartment area that has something to do with the electronic remote kill and I'm wondering if it has gone bad. I've not used the electronic remote kill key fob not even a single time. Anyone have any thoughts about where to look next.