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.

Chase Cook

2001 yamaha warrior YFM350x Popping Noise

Recommended Posts

 I have a 2001 yamaha yfm350x and it has a brand new top end, new carburetor (stopped the leaking problem and is now getting gas to it), new CDI box, new stator, handlebar switches work, off-and-on switch works, new starter solenoid (works), new neutral relay (works), ordered a new Rectifier on its way, good strong blue spark. Has compression, valves are right. Timings is right and is TDC. When I try to start it it just makes a loud popping noise like its backfiring but it's not because its not running when I push the throttle all the way and when i barly push the throttle it try to start but won't, so I'm trying to figure out what could be the problem not starting now, Getting very fustrated with this thing and put some work and money into it and it's not still not working. This is the only atv I ever had that I can not figure out the problem to get running. Need help please..

Edited by Admin
Added issue to title and moved to Yamaha ATV Forum

Share this post


Link to post
Share on other sites

Just because the piston or like you said timing is at TDC does not mean it’s not 180 degrees out. That’s exactly what it sounds like to me.  I’ve been there and done that.   

Take a step back and a breather and check it again.  Don’t let the frustration get to you.   It’s most likely something silly that was over looked.  First check that it’s not 180 out and go over the timing one more time.  Pull the plug also and check the color to see if it’s black.   If it were a fuel thing you could spray a drop of starting fluid into the air filter and it would start. You can try that first if you want.   My guess is on the timing.   

Share this post


Link to post
Share on other sites

Ok thanks frank. I'll check the timing. I'll also advance it one tooth and reverse it one tooth to see if that will fix the problem.. thanks for your help..

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 Chase Cook
      I have a 2001 yamaha warrior YFM350x and started to work on it. The person who I got it from put a new top end kit in it. I already took the top end off and checked, brand new still. Had to clean the valves so it can get better compression. Put it back together and turned it over and and made good compression but also had a loud clanking noise at the bottom, put hand over carb and stopped making the noise when I turned it over. And won't start.  I know it is not the top end. Just cleaned it and valves. Need help trying to figure out what's the problem.. thinking it's the crank rod but don't know. If it is the rod can i just get a new rod for it?(would be great if so). Or does it need a hole bottom end . In need of help.
    • By oxidized_black
      5852fe66ca41e_2002YamahaYFM350XYFM350SServiveManual.PDF
    • By oxidized_black
      2002 Yamaha YFM350X YFM350S Servive Manual
      View File 5852fe66ca41e_2002YamahaYFM350XYFM350SServiveManual.PDF
      Submitter oxidized_black Submitted 12/15/2016 Category Yamaha ATV  
  • Similar Topics

    • By JJ78
      I have a yamaha big bear 400, tested all fuses and relays. When I turn on key I get nothing, no neutral light or headlights. Could it be the key switch bad?
       
    • By Curtis01
      OK, sooo  I finally did the old skid plate and screen removal to clean out my oil sump during an oil change...  This bike only has a couple thousand miles on it.  Runs like a top still...  Very few issues over the years after buying it used.
      But boy I wasn't expecting to see this!  Piece of a circlip, stuck up in the screen, and a another shard of metal and maybe a piece of gasket material.  Nothing in the oil but that...  Pristine otherwise, and still runs like a top.  Always has.
      Soooo, is it a wrist pin clip?  That's the only thing I can think of like this that could end up in there.  But definitely wanted to throw it out to guys that have seen the innerds of these more than I have.
      The valves on this thing are still within the factory spec even.  Been a really good lil workhorse...
      Any other ideas?

    • By billyz57
      New to Quadcrazy, Has any Yamaha owners had similar issue?
      1987 Yamaha YFM 350 Starts on Pull, but just spins on starter, and won't start.
    • 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.
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...