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Old 08-02-2010, 05:30 PM   #1 (permalink)
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Unhappy 91 300 not firing @ plug-rectifier or coil

have ck all fuses, no fire in back two wires of coil, red & black out of rec have fire. no green wire w fire? whats next?
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Old 08-02-2010, 05:56 PM   #2 (permalink)
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I may have misunderstood you, but the green wire going to the coil is a ground. I would try testing the ignition coil first.

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Old 08-02-2010, 07:24 PM   #3 (permalink)
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only thing i can say is..you may have a bad stator ??..if the stator goes out..you will never get the coil to fire. stators have to circuits to them..one sends power to the reg/rec..to charge the battery and work your lights...the other side of the stator sends power to the reg/rec..coverts the voltage from ac current to dc current..it then heads for the c.d.i..then to the coil..as all this is taking place..the pick up coil which sit's inside the stator cover..picks up a signal off the flywheel..when it see's that the piston is at TDC ( TOP DEAD CENTER )..it tells the c.d.i when to fire the coil on your spark plug...then everything repeats over and over..then shazam..you got a running motor...also..you may have a bad c.d.i..these are two important parts to make a engine fire and run...test each part..and see which one is bad..then move on to the next part in the circuit.
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Old 08-02-2010, 07:27 PM   #4 (permalink)
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I would test the ignition coil first, but I would bet it's the CDI, since the CDI is a common part to go out on those. There is no test for the CDI, other than to replace it with a known good one.
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Old 08-02-2010, 07:31 PM   #5 (permalink)
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I would test the ignition coil first, but I would bet it's the CDI, since the CDI is a common part to go out on those. There is no test for the CDI, other than to replace it with a known good one.
yep..you are correct helmut...make sure you get the same year and make..very important for it to fire right.
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Old 08-02-2010, 08:18 PM   #6 (permalink)
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thanks guys, i can always get help here. will try again am.
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Old 08-02-2010, 08:59 PM   #7 (permalink)
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try using the kick starter and see if it fires then , dont use the electric start if it fires using the kick start , the ecm is bad for sure the 300 has a bypass circuit built into the ecm to get you home with the kick start also never test a 300 with a plug , use a tester or a screwdriver in the cap odds are youll see blazes of fire with the kickstart
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Old 08-03-2010, 07:15 AM   #8 (permalink)
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try using the kick starter and see if it fires then , dont use the electric start if it fires using the kick start , the ecm is bad for sure the 300 has a bypass circuit built into the ecm to get you home with the kick start also never test a 300 with a plug , use a tester or a screwdriver in the cap odds are youll see blazes of fire with the kickstart
not trying to step on any toes here..but..i've worked on alotttttt of early model 300's..and i've never seen one yet that would fire on a kick start..and not the elec start..if it is gonna fire..it will fire off a elec start or kick start..only thing your doing in the kick start phaze is bypassing the elec start feature..when you kick start it..your putting manual force into the flywheel instead of having a small motor turn it over for you..if the c.d.i is bad in any atv..it won't fire period..never has in my years of rebuilding them..but..hey..i've been known to be wrong a few times around here. lol.
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Old 08-03-2010, 07:57 AM   #9 (permalink)
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ok don't mean to sound dumb, can't find cdi on schmatic. what & where?
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Old 08-03-2010, 08:04 AM   #10 (permalink)
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can't find cdi on schmatic,help
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