My 96 300 has no spark. Changed cdi, coil,sparkplug and still nothing. Any suggestions?

 

Before changing a CDI you must do the tests at the CDI plug. Is the earth lead (green) earthed? The manual gives resistance readings for the trigger coil and alternator wires, I prefer using the voltage they produce when spun on the starter, i,e, if the alternator wire (yellow I think) is producing AC volts, the stator is OK, same with trigger coil wire. Does the ignition wire give 12v with ignition on. I think the kill wire (black/white) is earth to run on the 300, but whichever, it is earthed one way or t'other with the ignition key. You have changed the coil so no point in ohming that wire. That leaves the neutral wire, no idea on that one as Honda kept changing, earthed when in neutral, earthed when not in neutral, I think it was live for one CDI. Which also begs the question, which CDI have you bought, and which should you have bought? As Honda made at least four different CDIs for the 300.

 

Linear Diode in front center under fender in black junction box ohms out one direction and change meter leads to see if reading the same if is diode is bad only should ohms one direction

 

Also check green wire[earth] in connector hanger in front of battery sometime if battery box lid is left off trash and water get inside an causes bad connections or no connection also sometime green wire get broke inside connector.