Jump to content

  • Do you own an ATV? Join our Forum!

    As a member, you can post in our forums, upload your photos and videos, use and contribute to our downloads, create your own member page, add your ATV events, and even start your own ATV club to host your own club forum and gallery.  Registration is fast and you can even login with social network accounts to sync your profiles and content.

1991 big bear help

Need help 1991 big bear 350 4x4 with no spark

Recommended Posts

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 

Share this post

Link to post
Share on other sites

Topic moved to Yamaha ATV forum and added ATV and issue into topic title.

Share this post

Link to post
Share on other sites

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 ? 

Share this post

Link to post
Share on other sites

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

Share this post

Link to post
Share on other sites

" my stator and pick up coil is up to spec brand new" If you bought an import cheapie that might be the problem? other than that I would do as Mr. Angerano suggested.

Share this post

Link to post
Share on other sites

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 ?

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Similar Topics

    • By dctaz37
      Hello, the ATV doesn't stop anymore so I guess it is time to replace the brakes. Looking for part number and instructions. I think it may have shoes front + back and the front would be hydraulic. 
    • By mkibbe
      My 2014 750 king quad stalls sometimes when I touch or turn the handlebars,the problem has gotten worse,my machine has 475 miles and is only trail ridden,I have a new factory battery and i have 14.2 volts when the quad is running and 13.3 on the battery when not running,also using a multimeter there is no change in volts when turning the bars until it does stall,If I pull the 40 amp power steering fuse it will not stall.......I've been told its the ECU,Hate to buy one if thats not the problem,but its kinda leaning towards that,,,,,need some opinions.

    • By Glen Hoerschgen
      Hey guys i have a 2002 yamaha wolverine that needs a new wire harness.  Does anyone have a clue where i can get one new or used. ive looked all over and cant find much on a 2002 model.  Any help will be greatly appreciated . thanks so much
    • By Nick Gudex
      Hello I am new to this site and I havea problem. I have a 1987 big bear 4x4 that will not spark. I tested pick up coil per repair manual and I tested my new coil both ok. It puts out 9 volts at the coil but It is reversed polarity. So when I hook my meter up to it she shows -9 volts while cranking. When I put a test light  on it it flashes. Being an electric system this should tell me something but I don't know what its telling me. I have yet to meet one i could not fix but this old girl has me stumped. Any help would be awesome. Thanks to all.
    • By Gary Mier
      1997 Yamaha 350 Warrior, should there be oil in the stator area? Have a no spark situation.
  • Similar Tagged Content

    • By jolio
      Just got a '98 Yamaha big bear 4x4 in working condition (so far). Looking forward for some good information on this site about how to keep it alive.
    • By Muskyjim
      I recently purchased a 99 big bear 350 2x4 that was sitting for a while got it running and went to take it for a ride after about 10 minutes into the ride it stalled and wouldn't let me shift down into neutral tried rocking it back and forth but will not go into neutral...can anyone point me in the right direction on where to start?
    • By Christy Miller
      Need a wire diagram for 
      99 big bear 350 4x4 can anyone help I have no spark my roommate drove it ended up losing the battery and it grounded out a.wire in the middle of harness was burned to BEAR any suggestions ty
    • By KotaGman
      My bear big fires up with the pull start fairly easy. My electric start worked fine but now doesn’t even try. I bought a new battery and the same. The odd thing is, when I start it up at times, the neutral or reverse light will light up at times... depending on if it’s in neutral or reverse of course... wondering if anyone knows where I should replace? 
    • By gareth leifheit
      Ive got a Big Bear 350 4x4 that has been sitting for a couple years. It was put away running but now the pull start wont move and the starter wont turn it either. Any ideas what I can lube up or bang around to loosen it up? Thanks
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Create New...