Brute Force -- hard to start when cold

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BruteForce
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Brute Force -- hard to start when cold

Postby BruteForce » Wed Dec 26, 2007 5:19 am

My 2005 Brute Force is almost impossible to start when the temps are cold. It takes about 3 minutes of cranking, giving it gas (with the choke on), then once it fires up, it takes another 1-2 minutes of giving it throttle before it will idle by itself.

With the amount of snow we've been getting, I've been firing up the ATV daily to plow snow..

Any suggestions on resolving this?

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Postby Kendo » Wed Dec 26, 2007 8:22 am

Are you sure the choke is working? Have you changed the jet to compensate for high altitude? If so, you may need to fatten it up for the colder temps.
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Postby ACLakey » Wed Dec 26, 2007 9:38 am

Are the carb heaters working, correct me if I am wrong but I believe that model has them.

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Postby GrizzlyGuy » Wed Dec 26, 2007 11:16 am

My dealer's mechanic ran the tests for Yamaha when they were trying to figure out how to fix the cold starting problems on the new Grizzlies. He found that by putting in 30W oil instead of 40W oil, no more problem. Twas a viscosity problem at low temps. I don't know if that would work for your Brute Force or not.
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Postby zkeys » Wed Dec 26, 2007 7:04 pm

Hey BF.
You have the 750 right? Not sure I have ever heard of a cold start issue with any of the Brutes. My 650 SRA, which is carbed a bit different than the 750, does not really have much problem starting in the cold. Usually choking it on full without any gas until it starts, then just moving the choke down as the revs pick up. Then it idles good after 20-30 seconds of having the choke on. I just did this a few days ago when it was about 25 out, and I had not run it in a few weeks. Like said above you could have a choke issue or a jetting problem. I know that any changes in temp or humidity causes mine to act funny. Usually it does not affect starting though....hmmmm.
Let us know what you find out.
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BruteForce
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Postby BruteForce » Thu Dec 27, 2007 10:21 am

Well, for oil, I'm not certain what's in there as my local dealer recently changed the oil.

As for rejetting or carb heater, I've not done anything to re-jet (only adjusted the idle), and I'm not aware of a carb heater.

Any suggestions for inspecting and or rejetting appreciated.

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Postby DAVE » Sat Jan 05, 2008 12:50 pm

I had the same problem.....cold starting. My valves were way to tight. Bam ajusted the valves and it starts perfect. :thumbsup:
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Postby Ken » Sun Jan 06, 2008 12:30 am

GrizzlyGuy wrote:30W oil instead of 40W oil, no more problem.
Don't they use a multi-viscosity? If you're using 0-40W...it's 0 when it's cold.
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Postby The Modfather » Sun Jan 06, 2008 8:07 pm

Get the valves adjusted - specifically the exhaust valves. I'm willing to bet that they've tightened up. My prairie was notoriously cold blooded - to the point where it was becoming less and less enjoyable to ride. I just did my 100 hour service on it, and did my valves - the intake was spot on, but I could barely get a feeler gauge under the exhaust. Now the thing is a completely different bike.

My 2¢

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Postby The Modfather » Sun Jan 06, 2008 8:08 pm

DAVE wrote:I had the same problem.....cold starting. My valves were way to tight. Bam ajusted the valves and it starts perfect. :thumbsup:
Dang - ya beat me :) I shoulda read the whole thread before replying I guess <sigh>

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Postby BruteForce » Sun Mar 23, 2008 6:00 pm

Turns out, my hard starting was due to multiple problems.

- Dirty Air filter
- Fouled and dirty carb
- Jetted wrong and needed to be re-jetted for 7k altitude

Had those things done (Cost $800) :shock: and it fires right up.


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