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.

Big Al

1987 Yamaha Big Bear How To Test CDI

Recommended Posts

Hi, I’ve also found bad connections in the spark plug housing. Reach in there with a slot head screw driver and unscrew it and check it out. 

Just sayin’ 

  • Like 1

Share this post


Link to post
Share on other sites


On 9/5/2018 at 3:56 PM, bryanta0502 said:


If someone could find the link to this i would like to check it out. Sounds very interesting.

Any update on this? I'd be interested too.

Share this post


Link to post
Share on other sites

Wow. Everyone is all over the place on this. 

Great looking bike awesome find lucky you! 

The cdi is a working or non working component.  So the fact that it fires up I would say it’s good.  

Now since you have all the plastics off and everything is exposed I would take your time and unplug each plug one at a time and clean and add electrical lube and reconnect. 

A good eye glass screwdriver allows you to get in and scrape clean the contacts of all the plugs.

after that go through all the wires that are attached with a bolt or screw, grounds, battery connectors and the starter relay .  It’s very possbale that the starter relay is no good and a much cheaper part to replace. Keep in mind the electrical system is big! That means the coil wires, ignition, handlebar controls, regulator etc. do it in sections and move on to the next section.

After all this is done if it still does the same thing it hasn’t cost a penny before you start guessing and buying parts and all bad connections are ruled out. 

Put a fresh battery in that baby and see what you got.

Lastly is I’ve had a bad cdi box and one way that it will not perform is if it has moisture inside. Simple stupid way to get that out is to put it in the oven for 10 min on 250! Make sure the oven is on 250 before you put it in and no more then 10 min. Take it out and cool off and try it. 

Good luck and keep up posted.

 

 

 

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 Topics

    • By bradley nelson
      Im cool with the police in my area so i can ride on public roads.
    • By Seymore
      I made my intro about a QuadRunner I was working on and found a multitude of problems. Most I fixed, but I'm thinking that I'll be making more trips to see the 90' LT-250/4WD. Age and needing regular attention is the reason. The owner, NOT being mechanically inclined, adds into the equation.
      So, I deliver it and was offered, as payment, a 95' LT-250/4WD, with paper. It didn't run and had been sitting outside for last 12+ months. It was (basically) all there. This happened Saturday and this "Barn Find" came home to live out it's final years (I suspect).

       
      Today I finally found time to look at her. Not a pretty sight. Rough life, many hrs....... MANY! Only 2399mi, but the speedo is disco'd. I just want to know if this will be worth pursuing. First things first, a really good cleaning. I hate working on dirty vehicles.

      The battery actually took and held a charge! The carb was pulled, cleaned and the tank drained. Found a broken orange wire, dangling loose, near the carb. It was hot when the key was on and ended up connecting to a 10A fuse block. Well, I wonder why it didn't run???? Hmmmmmmmmmmmmm! 
      Carb back on, fresh non-eth fuel, had to remove the air filter for this test (needs replacement), sprayed a little ether..... hit the starter, fired and died. Third time's a charm, she runs. I'll be going thru things as I can and questions will follow, in this thread.
       
      WOOHOO!!!
    • By artis allen
      I bought a Kazuma Cougar 250 from a guy who used to fix ATV's but wanted to get rid of all his machines because he's "too old" and wants to quit fixing them, from what he says.  anyway,  One of the machines I bought was this Kazuma which I can't find any parts for it, or very little parts.  I found one website that still sells parts, which I'm thankful.  For the internal parts, I had to refer to the Honda Rebel 250 for parts.  I had to buy 2 new pistons and gasket set and I couldnt find the parts so I did some research and found that alot of the parts are similiar so I ordered it and it was a match.  I also used the manual for the Honda Rebel/Nighthawk and use this information to disassemble and assemble the motor.  Very helpful for anyone who has one of these things.  If anyone has more info on these things, please feel free to post.
    • By StolenATV
      warrior 350 is a 2002 it has a lot of custom features and after markets stuff that will stick out when u see it that ive done to it the plastic and headlights is from a 94 I’ve also rebuilt the top end of the motor with a new high compression piston & polished the intake and exhaust valve ports polished the inner area around the valves to keep carbon buildup from ever happening it has a lot of new parts it’s been rebuilt from the ground up all wheels are the bike runs amazing on handlebar dash pad has a black toggle switch for the LED lights on front bumper the rear axle is painting and the rear brake hub is painted blue so we’ll stick out and be very noticeable on the outlaw clutch aof lever the outlaw emblem is painted by me will stick out like a sore thumb it has custom rear Warrior decals on back fenders also has a monster energy ATV fx decal kit also has a lot of other stickers on it from parts that has been put into the quad I raced it a couple times would really like to have it back if it can be found I love a lot of money invested in the bike over the years I don’t have very much to offer right now for a reward
      Parts list on stuff I’ve done to bike over time
      Team Alba Front wheel spacers
      All 4 wheel hubs painted dark purple
      Front wheel hubs shields painted red
      polished clutch cover
      Tusk competition front bumper
      Tusk polished competition nerfbars
      Tusk rear brake rotor Tusk super bright white headlight bulbs
      Tusk clutch kit
      Champion Powersports 8809 spark plug
      PRM products full rear swing arm skid plate
      Fly racing purple handle bars
      Fly racing handle bar grips
      Artrax mxt tires
      new Yamaha ignition coil
      Dg RCM Chrome 3 piece performance exhaust system
      Wiseco cam chain
      Wiseco 10:25:1 high compression piston
      Ek racing X O ring Drive chain
      Outlaw Racing aof clutch lever
      Yamaha grip seat cover black with a small silver-edge on the back side of the seat with Yamaha written in block letters
      Led smoke brake light
      Lower rear fender braces painted blue
      Blue led light on the back side of the front bumper to light it up in the dark
      Gearing is stock 13/40
      Story on what happened
      Went riding with my girlfriend and some of my friends a few months back we chained our bikes up so no one could take off with them after we left after we got done riding for a little while to get some gas and food to go back out riding again we came back and all of our bikes where took we’re only gone for about an hour
      The post Help me find my warrior appeared first on Stolen 911.
      View the full article
  • Similar Tagged Content

    • By John Victor
      My father-in-law gave my boy a 1999 350 Big Bear. It's been sitting in a barn for a bunch of years. It runs great! My boy has been riding a couple weeks now and it has developed a squeal coming from the front end when you get off the gas at speed. No noise during acceleration. At first I thought brakes. I took it for a ride and I don't think it is the brakes. I feel it is the front prop shaft U-joints, front differential or one/both axles. I pulled the fill plug on the differential and I can't find anywhere how much gear oil should be in there. My gut says up to the fill opening. It doesn't have a manual. It's wet in there, just don't see any gear oil.

      #1 Should I fill the differential with gear oil up to the fill opening?

      #2 How do I check or know if the u-joints are bad? That looks like a "Big Bear" of a job if they don't need to be replaced.

      #3 What else could it be? I don't think it is the front bearings. I jacked the front wheels off ground and no play in the right wheel. Very little play in the left wheel, looks like the lower control bushing is where that play is coming from. The rubber CV boots look original but all still intact. Wheels spin easily without any noise.

      Thanks for any help!
    • By NoDeer
      I have an older (1987) Yamaha Big Bear 350.  I have arthritis in my thumbs.  Is it possible to replace the accelerator with a motorcycle accelerator (ie. twisting the handgrip)?  This would be more comfortable for me due to the arthritis.
    • By Dee Morris
      I bought my big bear in 2009, never had a bit of problem with it until last year. It quit starting but still would click when I tried to start it. I replaced the solenoid, the cdi module ( it was burned on one corner) and this year replaced the battery. I have all lights but still will not start and I do not have the clicking when I try to start it. Can anyone give me any ideas what to try next? I haven't had any luck finding videos about the 2008 Big Bear. I'm trying to avoid the expense of sending it to the shop. 
    • By Arnold Schimberg
      Hi Guys
      I have 88 4trax FW , it has a booster circuit
      In the cdi control fed from a leg in the alternator. 
      MY Honda service manual says you will get no spark without this circuit on this model. 
      Can someone explain a little about this please ?    Thanks
    • By Beretta7
      Need help trying to figure out how to find the open wire for turning off my Big Bear.  Will srat with no issues and both the kill switch and main switch fail to kill the motor.  Any ideas where the open is
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...