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Bad spark plug, bad spark plug wire
The most common reason for a Honda 400EX not to fire is the need for a new spark plug. Try replacing the spark plug to see if that fixes the problem.
Your car may be on fire.
Yes a ground wire can cause a spark and cause fire
coil, distributor, distributor cap, plugs, or wires.
A very good possibility is the opti spark distributor.If this distributor gets slightly damp,it can cause several problems.
my scrambler use to back fire i changed the spark plug and it never did it again
The cracked plug can cause the wires to spark and cause a fire. When the wires are plugged into it where the crack is the wires can touch the socket and cause the fire.
The most common reason a Honda burns up coils is because other ignition components are worn out. A healthy igntiion system with new factory parts requires about 12,000 volts to fire a spark plug. An engine with worn out spark plugs, distributor cap and rotor, and spark plug wires can require as much or more than 25,000 volts to fire a spark plug. The excess energy required to fire the spark plug has to be generated by the ignition coil and causes it to burn out. Two additionl point. Always use factory Honda ignition component and replace the ignitor when replacing the coil. These parts are not cheap but Honda ignition systems work best and last the longest with Honda parts.
as to fuel, probably a pump or filter as to fire, could be the coil or distributer cap
A bad spark plug(s) can do that.
First do you have spark at the end of the plug wire for the spark plug to fire. If yes, do you have fuel from the injector. If you have spark, then most likely no fuel. Check the wire feed to the injector. Or, could be possibly a blocked injector.