Question about 2003 kawasaki KX 125

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Bike keeps fowling plugs could it be the

Bike keeps fowling plugs could it be the crankseals on a kawi 125??

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It could be a rich mixture. look on the carb and you'll see a screw ( straight head ) this is the air mixture screw. try turning it out a quarter of a turn and see how it runs. out = more air in = more petrol causing black soot on plug. you will notice lots of smoke out of the back if your oil mixture is too high. 32/1 will be fine and change your spark plug instead of cleaning old one

Posted on Apr 28, 2015

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Usually 2 strokes foul plugs when the oil is two strong in my old bike i mixed the gas 40:1 try that and if it dosent work i would take it to your nearest dealer and get them to check it out

Posted on Feb 09, 2010

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1 Answer

Spark plugs fouling


black soot is overfueling. And as it is a trail bike operating in dirt and mud conditions I would be looking at changing the air filter first. Change to a hotter plugs may help (select plugs up in the heat range ). Check reason for extra fuel ( choke flapping on or float level )

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That can mean there is high blow-by internally in the engine. It can also mean an internal leak from a crack in the block, cylinder wall, piston, piston ring, ect.
How does it run? I have seen some older bikes "blow" a little but keep a close eye on oil level and check spark plugs for heavy fowling.

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It sounds like your coil is putting out to much fire...I'm not sure but if it was me I would try a new coil. It could also be gaped wrong

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is there power and pulse to coil 2&3 Cyl? rev counters run of the coil pulse.Number 2&3 cylinders are likely to be fowled now so replace plugs and retry (a fowled spark plug will never fire) it will only track

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