Question about 2005 kawasaki KX 125

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I was riding my 2005 kx 125 and it suddenly started to slow down and stop. At first i thought the chain had jammed but it hadn't. It was like the engine locked up. It will kick but wont start, what could this be?

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  • jm preston Apr 23, 2010

    The plug is fine and there is compression...?

  • jm preston Apr 23, 2010

    what ratio of 2 stroke do i need in my bike?

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Sounds like a blown ring

Posted on May 09, 2010

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Check for spark, compression, replace plug.

Posted on Apr 23, 2010

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1 Answer

My kx125, can still start it and ride it without a lot of compression, it only gets compression about half way towards the bottom when kicking it, but it does start.. Any ideas??


Hi, Colin you may have a kicking gear engagement issue, do a compression test when the engine is at operating temperature should be around 125-130 psi. for more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Minimum Compression Required
Curing 2 cycle engine problems
Small Engine Repair Compression Test on 2 Stroke Craftsman Chainsaw
https://www.howtomotorcyclerepair.com/images/Kawasaki-KX-125-KX250-Service-Manual-2003-2004-2005-2006-2007-2008.pdf

Mar 26, 2016 | 2003 kawasaki KX 125

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Check the cylinder with a compression gauge

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Aprilia mx 125 bogs down while riding then cuts out


Dont waste your time looking for something else. Go ahead and pull the spark plug and do a compression test. It should have at least 100psi. If not,its time for a top end rebuild. It gets worse when it gets hotter because the ring gap expands,and loses what little compression it has. Best to check the compression and rebuild the top end now,before the piston or rings break,and cause lower end engine catastrophe...

Aug 29, 2012 | 2005 Aprilia MX 125

1 Answer

My kx 125 was going well then lost power and now can not move kick start at all . how do i tell if the engine is siezed


sounds like it seized! if the kick starter wont go down. take the spark plug out, pour some thin oil down the hole, let it soak overnight, then try moving the kick starter again.

May 09, 2010 | 2005 kawasaki KX 125

1 Answer

My 2005 kx125 runs well for approx an hour,then bogs out and wont start again.


If its running for about an hour before trouble,there is not a lot wrong.Have a real good look to see it has the correct spark plug.This doesn't mean the original type but by looking at the plug and its colors it may be the wrong heat range.This is often the case with different styles of riding and any mods done to the bike.Next ride,take another plug with you.When the bike stops,put the other plug straight in and see if that gets you going.This would be the 1st place to start looking for the fix to your problem.Hope this helps

Dec 31, 2009 | 2005 kawasaki KX 125

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what do you mean it slows down, then speeds back up, is this when riding or is it when the engines idling?

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I have a suzuki 125 ts was riding it then stop for


is it getting fuel? try tipping a very small amount of fuel down rhe plug hole, replace the plug if it fires you have a carb problem.

Apr 11, 2009 | 2003 kawasaki KX 125

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