Question about 2003 kawasaki KX 125

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Kx 125 1992 wont start

Was going great just stopped,can kickstart all day will not go just makes a puff noise,please help wont 2 ride again ,cheers tankman1

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  • bazwoggy Mar 17, 2009

    i have this same problem on my 92 kx 250 bin runnin great ,and then stoped ,gonna do the compresion thing tomora and c if ther is any ,did you sort yours out and what was it?

  • CSFick May 04, 2009

    I have plenty of spark and got compression blew my thumb off hole second kick. It use to start like second kick then it started acting up and id let it sit for about 3 to 5 minutes with gas on and then slowly kick it, not enough to make spark but to get gas in to carb and it would work! But now it wont start at all and just has like a backfire every time i try to kick it, why does it do this and what would cause it? Its a 2003 or 04 kx 125 and im currently getting a manual but if you guys have any suggestions im all ears thanks!

  • nathan stillman
    nathan stillman Mar 31, 2014

    i had that problem and it was caused by a ceized piston

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Sounds like the rings are fried and needs a new piston and rings.. for an 80 there about 110 bucks for the whole kit

Posted on Mar 02, 2009

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Check for compression,put thumb over hole have buddy kick bike over, should have enough pressure to pop thumb off of hole.check for fire at spark plug while its out.check air cleaner,should be cleaned & oiled. drain carb fuel bowl,check fuel for contamination.use fresh fuel.if bike still wont start ,take off carburator & intake boot & pullout intake reed assembly,checking for broken or frayed reed petals.replace if worn or broke.reassemble.try to start bike.if no start, chek exhaust valve system to see if it may be stuck open from gumming up, or broken.ex valve system is kinda complicated, i would get a service manual before i tackled it.

Posted on Feb 17, 2009

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Theres back pressure on the kickstart and wont start, could it been the timing??


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what happened when it stopped?
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