Quantcast
Jump to content

  • Do you own an ATV or UTV? 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.

2006 Yamaha Bruin 250 - Carb Issue


Recommended Posts

About a year ago I replaced the carb on an Bruin that I bought from a relative, I replaced it because it was gummed up from bad gas sitting in it for a couple years. Replaced the carb, and ran it a little bit and it had a problem of the carb popping whenever giving it throttle. I assumed this was just a fuel air mixture I needed to adjust, but I was lazy and just let it sit for a few more months. I went to adjust it just now, but I don't know if I'm slightly retarded, but I can't find the fuel/air mixture adjustment screw anywhere on the damn thing. I've tried nearly every screw I could find on it without taking the whole thing off (Which is a pain on this atv). I'll link some pictures I have from ebay on this carb. I also checked manuals and diagrams of the carb and could not find anything anywhere. Please spare me from my complete ignorance.

spacer.png

spacer.png

Link to post
Share on other sites


Hey @KevinWithNumbers, welcome to Quadcrazy. 
Hopefully you held on to the old carburetor? If so great. Never let that go since oem carburetors are the best and always rebuildable as long as they are not cracked or striped.

I highlighted/arrowed where the air fuel screw is.  It may have a brass plug over it.  If so you have to drill the brass plug out.  Its pretty common to do this.  Some states require this cap for emissions reasons etc.    

Ive never had any luck with the $50 cheap aftermarket carbs from china.  They always have rough spots when you throttle up.  
Backfire issues etc. Just to finicky for me Hopefully you get lucky. 
If not then you can soak and rebuild the original carburetor.   We can help you along with that. 
 

09AC12DA-DAEE-4891-9133-DA733A10281D.jpeg

  • Like 1
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 God of Thunder
      Hello! When I put my Bruin in reverse....reverse light comes on....and the quad backed up. I went forward, and everything was great. Then I tried reverse again, and the light would come on, but the engine would only rev up, it would not move. This has lasted for a couple weeks, then yesterday, when I started it - I tried reverse....and it moved, I moved it forward to try again, and then it refused to move again. I don't know much about these machines (Yamaha) but it seems like even though the reverse light comes on, something isn't telling the bike it's in gear....where should I start with this problem?
    • By Andrew Klein
      Need some help please. I am trying to set timing on 4x4 350 bruin 2006. My brother and I disagree on which ones to use. If anyone has a picture they could share I would greatly appreciate it
    • By Matt3
      Recently, I changed the timing chain. I lined up all timing marks and set valve lash at TDC.  The mark on flywheel was on point as well when I looked through sight hole. I started the engine and starter turned it over then it hit and stuck. I did it one more time and the same thing happened. I took everything off and saw no damage. I tried to turn it over by hand and same thing. It turns halfway or so and hits. I loosened valve lash and took crank gear off and it does the same thing. It will turn over clockwise fully but not CCW. It seems like the crank sub assembly weight is hitting the gear balancer weight. I can turn crankshaft CCW while turning the gear balancer CW and get it to go but feel it hitting something. I also can spin crankshaft CCW without crank gear on and force the engine to break past the stick. It’s not the piston.
      Please give me some suggestions thanks
    • By BradF80
      Hello all,

       I registered on this site because I just purchased a new to me 2005 Yamaha Bruin 250 2wd. This seems to be the only place to get diagrams so I'm hoping I can download them sooner or later. The guy I bought it from said it had no spark. And it truly does not have spark...lol

      I haven't looked into much on it. Looks like he replaced the ignition switch and the stator. I'm thinking CDI box but I want to check the coil first.

      I look forward to helping others out on the electrical end of the world. I am an ASE certified automotive electrical technician. If it's 12v, I can usually figure it out.
    • By Karen
      Yamaha BRUIN 350 Quad
      Hi, think water got into the tank, have managed to drain fuel (not the best experience) and empty the carb of fuel ........ so it starts now and runs however, it cuts out on fuel and won’t restart, it will restart on reserve ?  When I turn it off and back onto fuel, it will start again.  If I take for a short run on fuel it will cut out again and only restart on reserve 😳. Any ideas what else I can check.  Many thanks
  • Similar Topics

    • By Leski991
      Hello,
      I have read many forum topics on this matter but have never found a similar problem. So i bought a cheap ass quad thats got all sorts of parts on it. It's a 1997(if you look the date on frame) Kawasaki KLF(Bayou) 300 EUROPEAN Model (atleast I think, since I'm from Europe), the engine is 1988 if I'm not mistaken and the CDI is 1995.-2006. ( 21119-1447, 6pin ). My problem is that I don't have spark. I would diagnose the issue but connectors from CDI to wiring harness have almost all different colors and I'm not sure if they are connected correctly (pictures below). Pickup coil is putting out around 400 ohms and is pulsing. CDI is being fed 12v by one y/r wire that is coming to connector and with 12v to one gray wire which is coming from ignition switch ( quad actually doesn't have ignition switch so I'm not sure if gray should be supplying power or not). Stator looks good cause when crancking all three yellow wires put out around 5v AC. Neutral light is also on which means the switch should be ok, if it even matters. I know it's not the ignition coil since I get no power nor any kind of pulsing to G/W wire that is coming to it ( and I even put another one on there just to check an it ended with the same result). I'm nowhere near proffesional around this type of stuff so any help would be amazing.




    • By chimmike
      Picked up a 98 Quadrunner 500 for a song. It's in rough shape, but funny enough it turned over and fired on starter fluid. Fuel lines are rotted to snot and the inlet tubes to the carb are rusty. I have a rebuild kit for the mikuni, but I'm wondering if anyone has used any of those alternatives on Ebay or Amazon that say they fit? 
    • By GranpaMichanic
      Grandson got a couple China made ATVs, lucky me, been a while since my motorcycle days, but I’ve mechanic and body worked all my life. Got an issue with the 110 cc one that’s got me scratching my bald head. Replaced carb, adjusted and checked all I see that can be done and it still Boggs out in forward gear , but will spin the tires in reverse and not bogg at all. What am I missing hear ? Anybody got any ideas on what to try next? Please let me know, I’m sure that the best thing to do would be to get rid of the the things and buy a real Atv, unfortunately the grandkids can’t afford it and Grandpa is supposed to be able to fix anything don’t acknowledge. Help needed!



    • By Brent Wright
      What's a good size to start a 10 year old on?
    • By AKMichael
      Hello All,
      I have a 1999 Yamaha Big Bear 350 4x4 trying to get fixed up so my grandson can go out in the woods with me.
      We have owned it over 10 years.  It got harder to start, until it finally would not.  Replaced the carb.  Right afterwards, it started and ran nicely, but after turning it off, would not restart.  Tonight I used starting fluid and ran, then died.  Adjusted the idle up a little, used more starting fluid and ran great.  It idled about 15 minutes.  Turned it off, and restarted.  Ran it around the yard about 5 minutes.  Turned it off, and would not restart.
      Any ideas or suggestions would be greatly appreciated!
      Thank you. 
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...