Question about 2003 kawasaki KX 125

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Spark plug keeps blowing on my kx 100 - 2003 kawasaki KX 125

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If your fouling plugs then either your fuel/mix ratio is off ( should be mixing 32:1 ) (or) your bike is running to rich( getting to much fuel to engine) which means you need to rejet the carb....example:( if you have a #50 jet,you need a #48 or 49) to install a new jet, #1.)remove carb,#2.)remove the bowl(4-screws),you will see the jet and #3.)unscrew jet and replace with smaller # ( number is stamped on the jet.) you can get jets from local motorcycle dealer( but they will probably have to order them). or go online to bikebandit.com enter your bikes year,make,model,ect.and just order from them........

Posted on Sep 27, 2010

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Posted on Jan 02, 2017

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Spark plug keeps oil fouling. What band of oil shoul use? Is 40:1 gas mix good? also wat spark plug? BR9ES, BR8EG, or R7376-9?


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Recommended spark plug for kx 250f


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Jun 08, 2009 | 2003 kawasaki KX 250

1 Answer

91 kx 250 blows smoke and drips alot of unburnt oil out the pipe


Does it have a stock pipe,carb,any modifications! If its stock,I would put a new ring and piston in it,it seems like your getting a lot of blowby,also make sure your air filter is clean. It would help if you used an iridium spark plug.

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