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.

Chad Byrne

1999 Yamaha Big bear won't start

Recommended Posts

1999 350 big bear ran with old carb on it but it leaked and most of the screws on it r stripped from having it spart so much i bought a new carb everything was the same installing it and now it won't start, any ideas

Share this post


Link to post
Share on other sites


Hey Chad welcome to Quadcrazy. 
Is the new carburetor an OEM or a Chinese carburetor? 
If the old carburetor was leaking it was most likely a bad float seal, or float adjustment. 
Maybe you can use all the screws from the new carburetor, make the adjustment on the float or use the float and needle from the new carburetor as well and see how it goes.   

Share this post


Link to post
Share on other sites

Thanks frank, i can't get some of the parts out inside of the old carb out the new one is a jay lure carb looks the same as the makuni thats on it nothing different, checked the adjustments its all factory settings but put the old carb on it and runs its a high performance carb does that change anything

Share this post


Link to post
Share on other sites

No it should not change anything. Thats a decent carburetor though. Have you checked that fuel flow to make sure its getting to and through the carb ? Maybe something is inside the bowl holding the float up.  Put a clean piece of hose on the carb and blow into it.  There should be air flow. If not then there's a problem. 
There could be a minor defect in the carb as well and you may have to open it up and have a look.  Maybe it was not assembled properly.  

  • Like 1

Share this post


Link to post
Share on other sites


Ok good. Just keep one thing in mind, if your swapping carburetors and it runs with one and not the other then its most likely a fuel problem.  I bet it's something minor on the new carburetor.  
Also on a side note make sure you don't discard the old carb. You can get a rebuild kit and the new screws for about $40.  The old carburetors are like gold.   

  • Like 1

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 Buell
      Hey guys, figure you guys would have some helpful direction or answers.
      So, 05 Sportsman 700 carb, new carb, fuel pump, new plugs, new air filter, new everything I can think of that is usually the running issues. Starts up fine, seems to run fine, but if under load, two people, or even one person, up a hill, or pulling a drag chain for the driveway, it starts to cut out and sputters and loses all power, until I back off on the throttle and just barely try to let itself catch itself and then I can take off again.
      I am going crazy trying to figure this thing out. Other than that, the quad runs great. Parents bought bran new, just used around the property, 5000 miles on it. Any ideas???
    • By dave3dracing
      Hi, I'm a new member
      Just bought a used 08 350 raptor with about 5 hours on it ( very clean ). Started fine when we got it. Now after a few mods (bumper, skid plates, air filter) Now will not start unless you pull in the clutch. I've checked just about everything and also checked that there is no pinched wires. Anybody have any ideas?:bangheadc: Thanks, Dave
    • By payne
      Have an Bear Tracker 250. Dont have the manual or any literature to help with. Anyhow, starts with pull start in gear, and electric starter doesnt work. Also, neutral light doesnt come on. Where should I begin?? Need some direction on troubleshooting all this. Thanks a million.

    • By Steven Workman
      So I have a Honda Fourtrax 300 year 1988. The ignition doesn’t start it with no sound. The headlights won’t turn on. It has a brand new charged battery, fuses are good, oil is good, gas is good, reverse is rusted, it shifts good, won’t jumpstart but when you try it will turn over, it will start if you jump the solenoid give it gas and spray starter fluid on the breather but it won’t stay on long but will stay on for the little time it does by itself. I don’t know what’s wrong and I need help!
  • Similar Tagged Content

    • By Scott Sirr
      View File 2007-2012 Yamaha Big Bear 400 4x4 Service Manual
      2007-2012 Yamaha big bear 400 4x4 irs service manual
      YFM40FBW
      Submitter Scott Sirr Submitted 12/22/2019 Category Yamaha ATV  
    • By Scott Sirr
      2007-2012 Yamaha big bear 400 4x4 irs service manual
      YFM40FBW
    • By Hondasher
      I picked up a 1997 Yamaha Big Bear 350 2X4 a week or so back in non running condition, apparently they said it needed a new carburetor or a battery, I cleaned the carburetor thoroughly and got it running on idle and without choke now and it shifts into all the gears even into reverse. Aside from making me bounce a little when trying to start out with a bit of throttle the shock suffice to say needs work. Anyways I made a video of it running and would like your opinions on it, as to how it sounds while running. It seems like it has a little whine I'm not sure why that is maybe someone can tell me what it is. Anyways here is the video.
       
    • By Gary Ferguson
      My old Big Bear nearly left me stranded but I managed to limp back to my garage just before it died. Now No Spark. I’ve changed the obvious, inexpensive and easy parts- spark plug & coil without any luck. 
      Ive stripped it down and traced all of the related wiring, checking as many connections as I can but no luck again. 
      Next I pulled the cover and accessed the stator housing to inspect and do some resistance testing to ID a possible short. 
      Here are my readings:
      Source coil- 325 ohms
      Pickup coil- 225
      Can anyone tell me if these are good numbers, and if good, where to go next?
      I assume my next purchase will either be a new stator or CDI, but since neither of these tend to be returnable items I want to be as sure as I can I’m gonna get a resolution to the problem!!
      Thanks,
      Gary in SC
    • By Dave Ayoub
      Ok i am not quick to jump on a forum and post a question without doing my own part and trying to research and solve the problem myself but I cannot find any definitive information anywhere about my problem. I have a Big Bear 350 that I picked up very cheap which had been sitting in a field for years. I am not new to building wheelers but this one has me beat. After rebuilding top end and replacing the carb it fires right up. The vin has some number worn off from being next to the shifter but from the parts in the clutch i assume it is early since 87 parts seem to be the only ones that match. Thats when the plot thickened. 
      Reverse works fine but when in the forward gears it would not go past 1st and was hard to get into neutral. ie. a it took a million clicks up to thump into 1 and as many down to find neutral. still never getting past 1st. within minutes i could hear metal screeching and whirling around in the clutch side of the motor. I took the cover off to find that 3 out of the 4 springs on the centrifugal clutch had broken and were shredded. Also the black mechanism that the pawl on shift shaft grabs moves was loose so it wasnt always grab to change the gear on the transmission. I tightened that mech, and replaced the springs assuming it would solve the problem since the gears were not actually changing from the lever and the carrier should obviously not only have 1 spring left. 
      After putting everything back together it did go into 1st fairly easy but then i again couldnt get it back to N without a million clicks down and couldnt get it to go past 1st. I did one time get it into a higher gear who knows what one but i gained some speed and dropped rpm.
      If i jack both the front and the back wheels off the ground and run the motor it becomes much easier to shift and i can get it to run through the gears pretty well. Usually going into N without a huge fight. not perfect but it does hit neutral and roar while spinning the wheels instead of gain rpm and with the power. 
      I have tried every possible position on the clutch adjustment screw without any noticeable result. I think this could potentially be where my problem lies at this point.
      does anyone know if the case is supposed to be threaded? because mine is not. obviously it seems as though it should be since every other bike ive touched has been. i even took the cover off my quadrunner to make sure it wasnt crazy.
      when the screw is adjusted and the jam nut tightened the screw will just slide back out since there is no threading in the case. accomplishing nothing. 
       
      Does anyone have any insight on any of this? Are my plates stuck, Centrif clutch worn out, case stripped or something else crazy im over looking? 
       


  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...