can anyone tell me the way to test a coil. the bike only runs on two cyl. and the other two that won't fire are off the same coil.So i figure i'll start there. thanks.
If both plugs don't fire and juice is getting to the coil, then that is probably your issue. All you really have are wires ane the components are the wiring is easy to check.
If you search on the Internet you will find ways to check the coil by making a test bench.