Question about 2003 Yamaha YZ 125
There are many possibilities for this problem:---bad piston rings, clogged air filter, carb problems, wrong plugs.
First check the spark plug condition, when this problem occurs:-----1) If your spark plug is dry and burnt brown its normal.
2) If your spark plug is whitish it means its to lean.
3) If your spark plug it fouled with black oil over it that means your bike is running to rich. ------------- Try playing with the idle screw or air fuel mixture screw on the side of the carb.
The idle adjustments are easy...........
1.) Adjust your throttle cable free play.
2.) Start bike and warm up.
3.) Once warm, turn idle up a little high at the adjustment and then adjust low speed pilot screw to achieve the highest possible idle w/o turning any other screw.
4.) Adjust the idle screw down to an acceptable level. ------------ There should be the highest idle. That is where the pilot circuit is most efficient and gives the best off idle performance. ---------- click this link below for more help:--- http://technoanswers.blogspot.com/2011/05/spark-plugs-keeps-fouling-on-2003.html ------------- This should help.thanks.helpmech.
Posted on May 24, 2011
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Posted on Jan 02, 2017
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