Quantcast
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.

Nick Gudex

1987 Yamaha Big Bear 350 4x4 No Spark

Recommended Posts

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.

Nick

Share this post


Link to post
Share on other sites


Does this quad have a source coil? It is much like the pickup but a little bigger. On the 350 Warriors this is a very big problem. Engine oil heat kills these coils. The best way to get this coil is just buy the whole stator. 

Your showing voltage says the pickup is working. I'm starting to wonder if you are actually testing the source coil? Have you tried reversing the polarity just to see if it sparks? Does it have 2 coils there? Or just one? If it has two then one is the source and one is the pickup. 

  • Like 1

Share this post


Link to post
Share on other sites

Has ignition switch been replaced? Only a genuine Yamaha switch will work. Any aftermarket will have NO spark. There are 2 pickup coils, 200Ω each and 1 source coil 300Ω.

  • Like 1

Share this post


Link to post
Share on other sites

Was having a similar problem with my 1987 350 Big Bear.  It had been used under very dusty conditions by previous owner.  Pulled the rubber boot off of the back of the on/off key switch and it was stuffed with dirt, shorting out the switch.  Engine would turn over, but no  spark.  Cleaned this boot out, never have had that problem since.

Edited by NoDeer

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.

Guest
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 Tagged Content

    • By AKMichael
      Hello All,
      I have a 1999 Yamaha Big Bear 350 4x4 trying to get fixed up so my grandson can go out in the woods with me.
      We have owned it over 10 years.  It got harder to start, until it finally would not.  Replaced the carb.  Right afterwards, it started and ran nicely, but after turning it off, would not restart.  Tonight I used starting fluid and ran, then died.  Adjusted the idle up a little, used more starting fluid and ran great.  It idled about 15 minutes.  Turned it off, and restarted.  Ran it around the yard about 5 minutes.  Turned it off, and would not restart.
      Any ideas or suggestions would be greatly appreciated!
      Thank you. 
    • By mike91
      I’m just wondering what year bike i got? it seems the vin has been rubbed off i got it from a auction here in Australia engine starts but seems has a dirty carb wont idle well
      and also has a problem I put it in gear and makes a grinding noise but does not move it the neutral light goes out but then when I change gear it grinds more in the higher gears as well I’m guessing the differential is stuffed so wanting to buy new part for it will start the pull down next week

      this is the first bike I have worked on used to dealing with cars




    • By Samwise
      View File 1987-1999 Yamaha Big Bear 350 4x4 Service Manual
        1987-1999 Yamaha Big Bear 350 4x4 Service Manual  
      YFM350FW
      YFM350FWT
      Submitter Samwise Submitted 12/04/2020 Category Yamaha ATV  
    • By Samwise
      1987-1999 Yamaha Big Bear 350 4x4 Service Manual  
      YFM350FW
      YFM350FWT
    • By jwline
      Friday evening went riding, rode for a good hour or so everything was fine. I went to take a short ride to the restroom (less than 100 yds away) and all of the sudden everything flickered and then just died out. Accompanying the problem I noticed the killswitch completely locked up. Once daylight hit took the killswitch apart to find it had shorted out and melted the plastic inside. Has anyone else had anything similar to this and if so what did you do to fix the situation? I have a new killswitch on the way to replace the obvious problem but was wondering could there be a bigger issue at hand. We tested with a voltage meter to make sure everything was still getting power from the battery and as far as we could tell it was.
      Any advice/info would be GREATLY appreciated.
      Thanks.
  • Similar Topics

    • By AKMichael
      Hello All,
      I have a 1999 Yamaha Big Bear 350 4x4 trying to get fixed up so my grandson can go out in the woods with me.
      We have owned it over 10 years.  It got harder to start, until it finally would not.  Replaced the carb.  Right afterwards, it started and ran nicely, but after turning it off, would not restart.  Tonight I used starting fluid and ran, then died.  Adjusted the idle up a little, used more starting fluid and ran great.  It idled about 15 minutes.  Turned it off, and restarted.  Ran it around the yard about 5 minutes.  Turned it off, and would not restart.
      Any ideas or suggestions would be greatly appreciated!
      Thank you. 
    • By DrtyGrlKristin
      Just thought I'd start a new thread for newbies to the site!
      If you're new here, tell us who you are, where you're from and what you ride!!!
      Lets get to know each other a little better shall we?
      I'm not new to the site, obviously, but...
      I'm Kristin from Denver!!! I ride a 2008 Yamaha Rhino. She's my muddy baby!!!!!! Several aftermarket parts on her. She's good to me! We try and ride every weekend. This weekend we're off to MOAB! :woot:
    • By mike91
      I’m just wondering what year bike i got? it seems the vin has been rubbed off i got it from a auction here in Australia engine starts but seems has a dirty carb wont idle well
      and also has a problem I put it in gear and makes a grinding noise but does not move it the neutral light goes out but then when I change gear it grinds more in the higher gears as well I’m guessing the differential is stuffed so wanting to buy new part for it will start the pull down next week

      this is the first bike I have worked on used to dealing with cars




    • By hutchir3
      Hello Folks....new to the forum.  I have two Warriors (87 and 92), and an 89 Big Bear.  Looking for some help with engine issues on the warrior, and my 89 Big bear backfired and died. Got spark, got gas, seems to have compression, (but haven't tested it yet...next). She rolls over good, maybe too good...seems soft. Have spark and enough compression to blow gas mist out the plug hole when cranking. Suggestions, Been running great since we got it.

    • By Randel1
      I'm having a problem getting a CDI unit that works. The parts list calls for a  4XE-85540-00-00 CDI unit. The one currently on the ATV works but there seems to be a problem with the spark advance curve. It will idle fine an rev. to about 1.5K then  starts bogging down sputtering, popping and basically running poorly. If you can get it above 2200 RPM it runs better. I have ordered and returned about 5 replacement modules that will not work at all. The unit currently on the bike has no part numbers or identification other than a Mitisibuchi logo. I am wondering if anyone else has experienced similar problems with replacement CDI's and if so what is the fix? So far I have not found a replacement CDI that will supply an pulse to the Ignition coil.
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...