Jump to content

  • Join Today, It's Simple and FREE!

    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 350 - Starts, idles, dies, won't restart

Recommended Posts

THis is actually a Bruin 350, I fat fingered the thread title.

This Bruin has been in storage for 1 year, with no stabil used and I'm attempting to bring this beast back to life.

The only way I've been able to to start this thing is:

1. Leave fuel cock open overnite

2. Adjust choke to mid-choke

3. Press Start

4. Idles for 3-4 minutes on a really LABORED idle (not smooth idle, but sounds like puttering on its deathbead)

However once I get it started, it seems to have a terribly labored idle for about 3-4 minutes, then dies. If you touch the trottle during idle warmup, it dies.

Once it's dead, there is no getting it started again until the next day.

I've done the following:

1. Visually inspected and cleaned sparkplug - verified spacing @ .025"

2. Drained old fuel and refueled with premium unleaded

3. Checked fuel flow from fuel cock to carb - smooth flow

4. Checked fuel flow from carb to carb fuel drain - smooth flow

5. Compression appears to be ok, however I do not have a tester, but placing my hand behind exhaust yields good pressure.

I have Fuel, Spark and temp fire, what should I check next? Any moving parts in the carb that have a tendancy to get stuck? Perhaps the stator?

Edited by bruinrider
Fat Fingered cc, 350 not 250cc

Share this post

Link to post
Share on other sites

Airfilter is clean

I have not cleaned the carb (any particular product to use to clean?)

Yes, using premium 92 Octane w/ ethanol.

Share this post

Link to post
Share on other sites

To clean the carb you will need to remove it. Take it apart and use a torch tip cleaner and carb/choke cleaner. Make sure EVERY nook and cranny of that thing is spotless. I have seen some people have problems with ethanol gas... a very big "could" but it could be that gas.

Share this post

Link to post
Share on other sites

I was able to resolve problem last nite. 2 days ago, I dumped 1/2 bottle of STP injector cleaner in the gas and left the fuel cock open, last nite I was finally able to get it to crank after 30 minutes of idle and die. I adjusted the idle control screw back and forth until I was able to keep it running at full choke. Once I had it idling smooth in full choke, I closed choke and throttled heavily blowing all the sentiment crap from the carb out. I let it idle for 30 minutes and then rode it at full speed for over an hour. I was able to then turn off and start at will, just like it was new.

I got up this morning and the machine easily started again.

Thanks for all the help!

Share this post

Link to post
Share on other sites

If you have a 5 gallon can, here's what I do: fill the can with 4 gallons of pump gas and 1 gallon of race FUEL. Since it isn't gasoline, it works just like fuel injector cleaner. It works great!

If you need to store it again, just close the petcock and drain the fuel out of the carb. It should be ready to go for next time.

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.

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 Ted Aregi
      I've got a king quad 750cc has anyone converted the fuel pump relay to a stronger fuel pump relay on there king quad?
    • By Dra O
      posted a while back - it was running at one point - I have all the plastic shroud off - it's down to frame and engine now
      -fuel pump: when line from petcock is attached, no fuel comes out other side to carb; the line to the carb is open (can blow through it); I thought when I cranked engine that the pump would spit out fuel on other side but it does not; I removed fuel pump and opened it up - diaphragm looks good - but internal areas had lotsa calcification build up - I cleaned this out and dried it good - the clear plastic pieces (?diaphragms) aren't broken - the spring w/ steel ball on end moves freely; am putting it back on tomorrow; but can anyone answer about the pump? isn't it supposed to pump fuel through it... to other side... to carb? puzzling
      -along with fuel pump: I replaced petcock 3 weeks ago (gas tank had rusty fuel in bottom - cleaned it out prior to new petcock); when I turn petcock arrow NOT to on or reserve, fuel comes out of line; when I turn it to on or reserve, fuel doesn't come out; puzzling
      -I don't know what's on back of fuel pump - it's a valve that has a hose coming out of it - looks like it goes to engine/carb - I haven't traced this out yet - what is it?
      -can squirt gas on air filter and engine will run for 2-3 seconds then stop - fuel in top of carb (under diaphragm) does same
      -it likely needs carb rebuild - will get to this - but something isn't allowing fuel to get from fuel pump to carb
      -I THINK it has a mikuni model x carb - diaphragm is ID 26mm  OD 68mm - hard to find inexpensive diaphragm, I guess because it's a model x
      -last thing - I replaced solenoid due to old one clicking; I HAVE to be charging the battery or it won't start/turn over - battery just goes dead; but if charging, it'll turn over nicely; i'm guessing it's a bad battery
      -any help appreciated - I've never owned an ATV before - inherited this beast from grandparent in-law
    • By BuckBilly
      Good morning to all !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
      Let's see if we can make this a daily event.
    • By thegipper
      Have replaced, Carb, fuel pump, CDI, plug, coil,fuel filter. Will crank but not srt. Getting spark and battery is fully charged 12.6V
      Any suggestions????
    • By Cj Winds
      I have a 2000 Polaris Xplorer with the 250 two stroke motor
      It does not want to start with the electric start, the motor cranks fast, the battery is good, and there is good spark when cranking. The engine starts perfect when using the pull cord, it even starts if I pull the cord slowly and starts with one pull. The engine idles smoothly once started. My wife says she needs the electric start to work.
  • Similar Tagged Content

    • 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 Kyboy
      Iam looking for help seperating the rear brake drum and the cover. Any suggestions would be greatly appreciate
    • By alexcross324
      Hi all, I try to find this manual in the threads but you have a lot of stock here
      Cannot find this particular manual.
      I found it for YFM200 but not sure if they are the same.
      Thanks if you could help me with that.
      Im new here so if I did something wrong, please tell me.
    • By davidwestfall
      looking for direct shift shifting lever that properly fits my 2003 Yamaha warrior 350 and fits my foot the same as a stock 2003 Yamaha warrior 350 shifting lever fits my foot
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Create New...