Yamaha 2005 Big Bear 400 4x4 Logo

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Dedra Strickland Posted on Oct 06, 2019
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04 beartracker 250. Replaced carb, checked valves and comp. All is good. While riding in 5th it looses power. Any suggestions.

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  • Master 825 Answers
  • Posted on Oct 16, 2019
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Joined: Jul 24, 2011
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A search for "high gear looses power" reveals............wait for it...................valve float. == weak springs. Hey, like my back. it is old also and weak

5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Jan 19, 2009

SOURCE: no power

being they have hydrolic valve lifters doesn't that mean we don't have to check the timing?

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tombones

  • 3567 Answers
  • Posted on Apr 15, 2009

SOURCE: I have a 125 kaw kx 2 stroke good power on low end

Pull the slide out and then move the clip on the jet needle one notch lower. Also try two notches to see which helps most. This will richen the mix in mid-range.

Pleas rate thia answer. Thanks v222407! :)

Anonymous

  • 431 Answers
  • Posted on May 14, 2009

SOURCE: crf 250 not running correctly

Dear Wivs 1 hi I am vortash I am thinking this just might be your battery or your magneto , the bike is firing but has not got enough power to sustain it . Most bikes run off the mag once they have started so it should also run off the battery for a while , if the mag was down provided the battery was charged .So sounds like the magneto hasn't charged it , most modern mags have a detachable rectifier or is attached to a rectifier somewhere on the bike . Check the output if you have a multimeter ,if you have a 6volt system it should be producing approx 8-9volts DC , a 12 volt system should produce between 13.5 14.5 dc voltage . I am sure this bike was produced with both depending what market ie USA . Europe , etc
hopefully this will show you if you have a problem there .. However another symptom similar to what you have described is due to a cracked Cylinder sleeve , as it attains an explosives compresion the power is lost from the cylinder hence the bike stops .. you can test this simply by holding a sharp pin on the cylinder face roughly half way down and tracing around the cylinder if the pin finds a crack it will stop abruptly ... indicating it's posistion .
I have disscounted the obvious ie: fuel as you say that you have thouroghuly checked out the fuel system and providing this bike has not been modified in some way I think you have covered most of the area I would . hope this is of help Regards Vortash

Anonymous

  • 1 Answer
  • Posted on Jul 07, 2009

SOURCE: 1994 JOHNSON 200 WONT RUN AT ALL WITHOUT CHOKE'ON

If you have a primer bulb and the motor "recovers" after a near stall with a pump of the bulb, then you have to replace your fuel pump. Johnsons do have this problem often. Otherwise it could be the high speed jets although it sounds like you checked the carb good. Also if you have a primer bulb, Replace everything from the tank to the engine. Costs about $14 at Wal Mart, $55 at a boat place.

Anonymous

  • 86 Answers
  • Posted on Aug 16, 2009

SOURCE: got a four wheeler that has spark and getting gas

HI. YOU MAY BE GETTING GAS TO CARBS BUT IS THE GAS GETTING TO THE PISTON. IF IT WAS ME I WOULD PUT A LITTLE GAS IN THE END OF THE CARB, AND IF IT STARTS OR EVEN KICKS A FEW TIMES YOU HAVE FOUND YOUR PROBLEM. JIMBO

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