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.

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 Tagged Content

    • By Brent Mason
      I have worked about 4 weeks on my Griz600 and have burnt 2 CDIs up ! I added a wire harness and stator and It starts but runs erratically like spark timing is off ! So I would like to try another CDI but I don’t want to Pay an arm n leg ! Anybody have one ? Thanks 
    • By Brent Mason
      I have been trying to get my Griz600 running right for 3 weeks ! Grandsons used it and it quit running , no spark ! New stator etc and started but ran terrible ! Found a burnt capacitor on cdi . Installed used cdi and burnt it also but ran same as other cdi . Came to conclusion wire harness had short so stripped it and found some bad spots fixed and another cdi ran terrible again ! Bought another harness and same rough running ! Checked spark timing with light (put tdc mark on case and on pull start hub) and when it starts timing right on but will jump 25+° retard ! When timing is on tdc marks it has no power ! The stator is new but I am wondering if the pickup coil is triggering incorrectly ? Also had top end apart when I first started having trouble and although rings were good I installed new rings . Also new timing chain and check the valves , they were good also . It kind of seems to boil down to the last stator I installed new ? I have done trouble shooting on quite a few cars , trucks , dirt bikes and ATVs but this is frustrating me ! Just wondering if anyone has any ideas ? Carb was new last yr and I checked it ! I
      IMG_4379.MOV
    • By Brent Mason
      IMG_4272.MOV Originally had my griz600 stop running and then wouldn’t start ! After testing all coils , valve lash , compression (115psi) and all tested ok I bought a used cdi . After cdi install it still wouldn’t start (no spark) ! So even though the stator , pulse/trigger and charge coils check within good range I decided to switch the stator etc ! It started but It is very unresponsive on throttle and acts like it is running in 2 Different spark timing ! With slight throttle it will take off good but instantly go into a very different running mode with no power like timing very retarded but it will switch back to running good for short period then bad again !  Since I replaced the stator and it started I then decided to install the cdi I replaced and it did the same thing ! Also I noticed the Used cdi I Took off had a capacitor that had swelled and extruded from the back of the cdi . I had always heard and I believed that when these CDIs go bad they machine will quit and will not run . Is that true ? I also checked the cam/valve timing and its ok ! Checked with timing light and it does fluctuate on idle ! I am thinking I have 2 bad CDIs . I also switched the trigger Coil wires and would not start then . Man , this thing ran good before and I am confused ! Video below may help !
      IMG_4272.MOV
    • By Brent Mason
      1998 Grizzly600 ! Slowly died then wouldn’t start ! All coils check good ohms ! Checked ac voltage from source coil get OL ! Is the source coil bad ? 
    • 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
  • Similar Topics

    • By Chris2018
      I have a 1996 Kawasaki Mojave KSF250. I have no manual on it and it has a no spark issue. If anyone could give me a hand with this or would possibly have a manual would appreciate it. 
    • By Blenderite
      Hello guys! New to the forum, and fairly new to ATVs. I've driven them, but never owned one. Now I do own one. Just picked it up today. It's a 1999 Yamaha Big Bear 350. It's been through some stuff. The guy I got it from told me the previous owner removed the front diff because he didn't want to replace the half shaft. So it's 2wd, even though it's supposed to be 4x4. Lovely. I can deal with that for now.
       
      More importantly, I need to get it running. The carb needs to be rebuilt. The guy I got it from said he sprayed it all out and it still didn't work. I'm concerned he might have damaged it or not put all the parts back. I was looking at a replacement carb, and the OEM parts is $600. I'd rather not spend $600 if there are any other options. I have seen carbs on Amazon and eBay that are in the $40 - $100 range that say they fit. Anyone have experience with these? I'm going to get a rebuild kit for the current carb just to make sure that won't fix it.
       
      Thats the first thing with it. Secondly, it was completely rewired. I need to find a original wiring diagram so I can put it back how it was, with a key and all. Currently it's wired with just a rocker switch. Any sources for a service manual that would include wiring diagrams?
       
      Thirdly, is the Big Bear 350 a good atv? I picked it up for $700. It does start and run when you spray starting fluid into the air intake, so I am not concerned about the engine being bad. I plan to use it for the farm, running around and carrying things with it like minerals and feed and such. Not really for mudding and things like that. How good is the 99 350?
       
      I am certain I will have more questions as I examine it more, but that's all for now. Thanks in advance for the assistance!
       
      -Blenderite
    • 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 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 Spike976
      So I dug my warrior out of storage replaced the carburetor with one off Amazon & it was running great. Last week it didn't want to start it would crank & I could smell gas but nothing. I replaced the starter,stator,solenoid,spark plug & coil & resistor but still not starting. Checked the stator and its at 30 ohms tried using starter fluid but nothing. I am completely lost and could use some help thank you
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...