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.

Juju02

2001 Yamaha big bear 400 4x4 oil leak

Recommended Posts

Yes I am a noob! But I still require your assistance, I acquired a big bear and noticed the boot in the rear covering the drive shaft was leaking oil.... So I did some research and it looks like it could be the rear main seal or a loose yolk nut. So I took the liberty tearing the back end off the ATV and now what stands infront of me is the yolk nut. Leads me to my first question how do I even stick anything to tighten the thing it's nearly impossible and if it is tight how do I get anything in there to loosen it so I can replace the seal?? Please any help would be much appreciated!

Share this post


Link to post
Share on other sites




you have to disassemble that rear U-joint and get it out of the way to take the nut you're referring to off, pull the yolk off the splined shaft coming out the back of the trans and replace that seal (Just did it on my Kodiak 400), then grease the U-joint and put the whole thing back together - something like $15 for that seal (I got mine off ebay - genuine YAMAHA).

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 emoyer105
      I have a Yamaha Timberwolf 250 2x4 that I purchased a while ago as a project. I fixed it up to where everything was working great in my opinion, however when I showed it to a potential buyer he complained about a vibration from the rear drive shaft. (Which I ridiculous seeing as he tried to wheelie it before that) Anyways I took the rear diff apart and found most of the seals and bearings where bad. So I bought a kit off of amazon only to find that it doesn’t have all of the bearings and seals. After finding that I decided to try to find a used good condition replacement but they’re all to expensive for me so is there a better alternative for me, or can someone point me in the right direction to get the rest of the parts?

    • By Christy Miller
      Need a wire diagram for 
      99 big bear 350 4x4 can anyone help I have no spark my roommate drove it ended up losing the battery and it grounded out a.wire in the middle of harness was burned to BEAR any suggestions ty
    • By michaelnewell
      I took front brakes apart recently and found pistons frozen in calipers. Havent been able to find cheap calipers for this bike
    • By KotaGman
      My bear big fires up with the pull start fairly easy. My electric start worked fine but now doesn’t even try. I bought a new battery and the same. The odd thing is, when I start it up at times, the neutral or reverse light will light up at times... depending on if it’s in neutral or reverse of course... wondering if anyone knows where I should replace? 
      IMG_1575.MOV
    • By gareth leifheit
      Ive got a Big Bear 350 4x4 that has been sitting for a couple years. It was put away running but now the pull start wont move and the starter wont turn it either. Any ideas what I can lube up or bang around to loosen it up? Thanks
  • Similar Tagged Content

    • By Timothy Doerr, Jr
      Hey y'all. I have a Yamaha ymf 250 BearTracker. I got this thing for free from people whose son tore it to hell. So it wasn't in great shape to begin with. i.e. no indicator lights (neutral light for instance), no ignition switch or key( wires were twisted together to make it run), get the picture yet? 
      So when it ran it ran rough and I got it running for a year or two, just something fun for the kids to ride on with me on gravels.
      Now just randomly, the start button stopped working so I had to jump the solenoid, then put a temp start switch in. Kill switch would still work. 
      However, the thing has no spark what-so-ever. I've check continuity through the start button and it shows the contact is working, ohmed out the stator, everything is in spec, the reg/rec tested fine as well. I've replaced the solenoid on the off chance it could've been bad and the cdi unit as well, along the the little solenoid relay unit. I'm still getting no spark. The spark plugs is new as well and the coils to the plug have been tested and are good. I've tested and trouble shooted everything I can on this quad and no luck. I watched countless YouTube "no spark" situation videos and it's not helped. Does anyone have any tips or tricks I could try? Would really appreciate some input on this. Thanks!
    • Guest
      By Guest
      Ok...I'm gettin' me juevos ready to do an oir filter clean....
      Went to my local harley/quad dealer and he had me purchase the No-Toil kit (Cleaner, Air Filter Oil, Rim Grease)
      What I've read is that the No-Toil cleaner will NOT clean
      other oils off air filters....just the No-Toil oil....
      So, I've also read that others have cleaned their air filters
      in the kitchen sink, used gasoline, or used flash solvent....
      Looking for advice as I've mentioned I'm very mechanically
      DECLINED!
      I'm going to wash the air box seal in the sink and give it a good dry....
      One more thing......No-Toil or Bel-Ray for filter oil?
      Thanks!
      -TD
    • Guest Fox300exchic
      By Guest Fox300exchic
      The Hop-Up: You may be saying to yourself, “that’s a chick bike,” and you’re right. But honestly, it’s so much more than that. It’s one badass bike. http://www.quadmagazine.com/quad/features/article/0,24942,1587044,00.html
    • By dyyjrr9
      I just got a 1991 Yamaha Moto 4 for my son and I am looking for a service repair manual. I know that the timing chain needs replaced.
    • By crazynordlander
      Hi All,
      Has anyone found engine oil in their air filter box. The must be little or no baffle between crankcase ventilation and that hose that attaches to the air filter box.
      I went to pick up my ATV today 60 miles away that they could not fix the jerky low speeds on and before I loaded it decided to check on this. Sure enough there was a good coating of oil with some pooling in the bottom of the air filter box. The air filter has oil on it too but is it a dry element or oiled element type. My guess from the color of it dry.
      I heard on a comment on my YT videos that there is a kit for this issue? Is this a CFMOTO fix?
      Thanks
      Kevin
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...