No spark Changed CDI Box, Plug is good, Coil is good, All fuses are good, Spark plug is good. No power to the coil? Any Ideas...

Cdi box get wet ?

coil you can test if you have a coil tester but doubt you do. CDI cant be tested. could also be a pick up coil on the stator, ignition switch, kill switch, tether if it has one.

check your ground wires,could be a bad coil lead to the plug,a bad coil in the stator,a bad plug?try these things first

You can't. You must verify all other components in ignition system. If they are all in spec. You know it's cdi.

ok did you check for a good engine ground

try replacing wire from cdi box to coil

Could be the CDI. Check the stator and pickup coil specs with a multimeter first.

If there is no spark and you replaced the coil next step replace the spark plug dont assume its okay replace it!! next step is to get the CDI Box checked. Probably need to replaced that first.

Yamaha ignition coils never go bad. It is probably the Stator/ Pulser coil (very common). You can check them with a ohm meter. You'll need the readings from a Yamaha dealership. The CDI box is very seldom bad But there is no checks that can be done on it. If everything else is fine ---than Yamaha says it must be the CDI box.(Rare)