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Need help 1991 big bear 350 4x4 with no spark

1991 big bear help

By 1991 big bear help
in Yamaha ATV Forum

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1991 big bear help Newbie

1991 big bear help

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I have a 91 big bear 350 4x4 with no spark what's making me puzzled is my coil is up to spec with ohms my stator and pick up coil is up to spec brand new and ohms reading checks out I got power from CDI coming out and power going in my coil wire from coil to CDI is getting good ohms reading plug is brand new but still not getting spark any suggestions or help would be appreciated I'm getting confused where do I go next please help me thanks 

  • Admin changed the title to Need help 1991 big bear 350 4x4 with no spark
Frank Angerano Grand Master

Frank Angerano

Posted
Posted

Even though you have voltage coming to and from the cdi does not conform it’s working.  

Two ways to see if it’s the cdi. 1 is find a used on from another bike same type and swap it and see if that fixed it. 2 is try to dry it out and see if that works.  Most cdi units go bad due to moisture.  Try to put it in the oven for 10 min on 250 deg.  Let it cool down and give it a shot.  If the spark works then obviously a cdi replacement is needed. The heating it up is only a temp fix as it will loose spark again. 

This worked for me but I had to replace the cdi bc it def failed again after a day or two due to moisture re entering the cdi. 

As far as testing the stator and regulator, ignition coil are all within spec with an ohm meter ? 

1991 big bear help Newbie

1991 big bear help

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Yes everything else checks out with the ohm meter only thing I haven't tried was my kill switch could be screwed and some one Also said the two black wires on the break lever sometimes go bad. Was told to cut them and ground them out is this true

Frank Angerano Grand Master

Frank Angerano

Posted
Posted

The two black wires on the brake lever ? A parking brake that has to be pulled in for the bike to start? I don’t think a bike of that age would have that. But double check. Also the kill switch. Simple test is to look for the two wires that kill the bike. Most are black with a white stripe and all black.  You have to put a continuity tester on the two wires at the switch and see if it rings when you hit the kill switch.  In order to do this properly you have to have the manual to see exactly what wires to test  

Have you tried what i said with the cdi ?

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