Question about 2003 Yamaha YZ 250

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Hi, bike ticks over fine then just turn the handlebars to the left and the revs go up on there own!!! most bizzare. Turn handlebars to the right and all is ok as in the centre position.Have fitted new throttle cable and it is not caught up anywhere can you throw any light on this please?

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Has to be the throttle cable , no other reason than that .... check again

Posted on Oct 17, 2010

Testimonial: "yes correct it was the cable as the expert said."

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I did clean my 250 kemco carberators .It idels wel,ref wel but does not want to go slow.Can you please advise me.


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This may not help but here goes.

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1 Answer

The bike idles great as long as the handlebars arestraight or turned to the right but when you turn the bars to the left it start reving up. check the cable it as no signs of a problem.


The cable is probably fine but it is not properly routed through the frame . When you turn the handlebar the cable is being pulled out of the top of the carburetor causing the motorcycle to rev up. You may have to remove the tank and experiment with cable routing to keep the handlebars from pulling the carburetor slide up from the idle position.

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1 Answer

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1 Answer

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2 Answers

No problem just done top end rebuild


Just ride it normally. Avoid super high revs when the bike is not in gear and using the power.

Please rate this solution. Thanks bookerm!

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