Quantcast
Jump to content

  • Join Today, It's Simple and FREE!

    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.

Freezeman

1985 Yamaha 80 Warm up CDI to make spark

Recommended Posts

I came across an odd temporary fix for a 1985 yamaha 80 ATV.  It has no spark, yet if I warm the CDI unit up a bit with a heat gun or hair dryer then it fires right up and runs fine until shut off then it returns to no spark until warmed up again. Partzilla shows $217 for a new CDI  

It's sort of nuts how I found out the fix to warm it up. My old shop TV requires my heat gun warm up around the transformer area every day before it will turn on too.  

  • Like 1

Share this post


Link to post
Share on other sites


The cdi is a sealed until.  And it’s that way for a reason.  It hates moisture!  Any moisture gets in and it’s dead.  I learned this a little while back while I was putzing around with my old cdi and went on YouTube to see what anyone has to say. One guy pointed me in the direction of putting the cdi in my oven. 

It worked believe it or not! 

Check this out. 

 

  • Like 1

Share this post


Link to post
Share on other sites

It truly was nuts to see this work.  I did it and the bike ran.  After a day it was not running.  Heated it up again and boom ran great.  So I added silicone and it was all good after that. I changed it anyway because I felt the possibility of moisture getting in could ruin a weekend of fun. But it’s a great trick to diagnose a damp 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.

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 Tiffany Rowland
      I recently purchased an 07 Honda sportrax and when I was checking the spark plug I saw the boot was ripped nearly in half. When I removed the plug it was blackened and covered in oil. How can I thoroughly clean the plug hole and remove any debris that is in there? Is there a small tube like vacuum or something of the sort made for stuff like this? The machine my dentist has would be perfect, maybe they do rentals! 😁

    • By Dimelol
      I have a 2003 Kodiak 450 that i purchased a while back with around 300 hours on it. It has never ran right from the beginning. Initially i thought it was just a carburetor issue because it was all clogged up from sitting for months. It has been cleaned, rebuilt, and taken off probably about 10 times troubleshooting this problem. I have quadruple checked everything including float height ect and it is set correctly, the jets are also brand new, needle and seat have been pressure tested as well. So after all of that I am convinced that the carburetor is not the culprit. I have an issue where the idle is very choppy, almost as if it is misfiring with a rich condition on top of that. I can use a brand new plug and run the machine for just a few minutes and it will be a dry and and coated in black carbon build up. The exhaust also has a strong smell at idle. I had trouble restarting it when hot for a while, but i adjusted the valves and it seemed to solve that issue. They were both way out of tolerance (tight). The weird thing is, outside of idle it seems to run pretty well. 
      So with all that being said I have ruled out the carb/valves/compression and moved on to the ignition and this is where i have a few questions about factory specifications. I guess the main question I have is, how strict are these tolerances? And could them being off by this amount cause the issue I am having? Do all three of these parts really need to be replaced? I would like to know before I spend the money on these new parts, and it not fix my problem. Below I will list what the specs were in the service manual along with the reading i got.  This is my first experience testing ignition components. I just found it odd that all 3 are out of spec according to the service manual.
      Spark plug cap resistance: 10 kΩ at 20 °C (68 °F)
      My Reading: 8.90 kΩ
      Primary coil resistance: 0.18 ~ 0.28 Ω at 20 °C (68 °F)
      My Reading: Fluctuated between 0.4 - 0.5 Ω
      Secondary coil resistance: 6.32 ~ 9.48 kΩ at 20 °C (68 °F)
      Reading was within the specified range.
      Pickup coil resistance: 459 ~ 561 Ω at 20 °C (68 °F)
      Reading was within specified range.
      Rotor rotation direction sensing coil resistance: 0.085 ~ 0.105 Ω at 20 °C (68 °F) 
      My reading was 0.3 Ω
    • By Asen_77
      Hi All,
      My name is Asen and I am from Eastern Europe, Bulgaria. Riding a Yamaha Raptor 700R and this is my first Quad wanted for a vey long time :)

       
    • By Stacy Hanks
      I have  2000 Yamaha bear tracker 250 - igniton relay and starter relay both were replaced also the neutral switch indicator was replaced-- bike will not show light on for neutral or start when button is pushed
       
    • By Shook
      Hi I have a 2000 big bear 400 and i just put a new carburetor on it and it idles fine but when you try to accelerate it sounds like it is going to die, so when it sounds like it is going to die I will give it more throttle then it will go just fine.
  • Similar Tagged Content

    • By Azjad
      So here's my situation.i picked up a super clean 225 moto 4 but the cdi has been cut off.i have numerous different cdi units and just can't simply afford to buy anything currently.im sure I can make something work I'm just seeking a little advise or ideas or thoughts. Any help would be greatly appreciated.thank you
    • By William Sims
      I have a 400 4by4 ,2005 green model,
      wounding how many different CDI boxes will work on it
       
    • 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 Bubblehead
      Have a 2000 Yamaha Grizzly YFM600FWA with no spark.  Checked the troubleshooting chart, and all checks were within specs.  CDI has part # 5GT-00  F8T36071.  Friend has a 1998 Grizzly 600 but his CDI part # is 4WV-00  F8t34671.  Are they the same?  Thinking about taking my CDI and put it on his ATV and find out if it works, but don't want to damage something if not interchangeable.  Thanks
    • By Big Al
      Hello. I'm new to this forum. I just bought this big bear. This thing is show room condition. Now I haven't had time to dig into it so it might be easy to fix. But the guy I bought it from said it needs a CDI box. Now is there away to test these to see if it's bad? I see they are hard to find. Any recommendations on batteries? Any help would be greatly appreciated. I'll get back with results one I get time to look at it.

  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...