Question about Yamaha 2005 Bruin 350 Auto 4x4

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I have a 2005 Yamaha Bruin 350. Seems to run hot. Pointed a laser thermo at the head and it is 290 degrees. I have the oil cooler fan jumped, so it's always on.

It has a new piston, rings, cylinder, oil pump and carb. Seems to have good oil flow. What else could it be?

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  • 98 Answers

Is the new carb oem part or aftermarket? Could be running too lean.

Posted on May 22, 2019

  • Sean Sturgill
    Sean Sturgill May 23, 2019

    Aftermarket carb with original jets, does not appear to be running lean. The plug looks good.

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6 Suggested Answers

6ya6ya
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SOURCE:

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Posted on Jan 02, 2017

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jmassengill
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SOURCE: oil in coolant only

You might have a blown head gasket that is allowing one of your oil galleries in the engine to mix engine oil with the coolant after the oil pressure gets to a certain point. You might also have a cracked head causing the same type of problem.

Posted on Nov 11, 2008

  • 369 Answers

SOURCE: 01 sts head and gasket good replaced water pump

The temp gauge being erratic should have been your sign. Are you sure its overheating or are you going by what you see being registered on the temp guage.Also after doing work such as water pump sometimes you will get air lock in the system you need to bleed the system after performing such a job. If the temp gauge is bad you need to replace it.

Posted on Jan 02, 2010

  • 1 Answer

SOURCE: insufficient egr flow. Cooling fan does not run

Is your AC system charged and working? I believe the pcm will not activate the fan unless the AC system is operational.

Posted on Feb 24, 2010

  • 68 Answers

SOURCE: 1999 Olds Aurora. Overheats after 10 min.

10 minuts really isnt enough time to even get up to operating tempature much less overheat. I would suspect from what you describe you may have a head gasket problem. compression from the cylinder will leak into the cooling system and push out the coolant. The fact that you have oil residue may confirm this. Does the temp guage read high when this happens or a warning light come on?... im suspecting probably not. There also could be an outside chance of a cracked head or block. most likely not but always an outside chance. Good Luck!!

Posted on Jun 16, 2010

  • 1403 Answers

SOURCE: runs hot . if left

cooling fan is a must esp. with a/c one fan should come on when the a/c is turned on if no leaks maybe thermostat

Posted on Aug 12, 2010

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I have a 2005 ford territory and there seems to be oil in the water.I run it for about 1 min and a oily dark pinkish substance oozes out from the cap in the water resiviour?


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Only one question? Is the temp sender telling the truth? When it tells you its hot can you sample the oil with a basic thermometer? After a run I would expect it to be around 80C, anything near 100C + is on the high side. Try checking it against a barbeque thermometer/ meat thermo to get some idea.

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Fans should run with the AC on tho,mine runs cooler with the AC on .

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Oil cooler replaced and still have over heating problems


If I was you I would try and get the engine replaced... This is the first thing that you should do.

If the engine is running hot and you found a lot of muck in the radiator, it may have been a faulty oil cooler but to me it sound like a leaking cylinder head gasket or even a crack in the cylinder head.

To chek if the cooling is circulating, the mechanic should remove the the thermostat unit for a few moments and slightly rev up the engine with the radiator cap off. You can then see if the water is circulating....

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1 Answer

Our EGR Cooler was replaced in late Dec 08. Would


It has an issure you can find the date of service first recall at www.alldatadiy.com and read the Service bullitins for you unit. It affects the 2005 2006 and 2007 they are just learning of the problem you have described. Running with pitted heads can destroy your engine if the head gasket blows. And Not all fords are bad, just some things they find when trying to keep it right under the goverment thumb.

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1 Answer

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The primary pump is defective, it has a check valve that is bad so replace the pump it costs $0.00 compared tothe pressure pump thats $900.00 and it will be damaged if let run dry.

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