Question about 2002 kawasaki KMX 125

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Kmx 125 engine knocking

Hi, i ran out of oil the other day(2 stroke) the bike died, filled it up after walking it 10 miles home, it started but would die down and not tick over just cut out, thought it would be the rings so i bought a new set and piston but it still does the same but with a knocking noise and seems to have little compression there. also i had it re-sleeved 9 months ago and there is no damage to the bore.
can any one help?

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  • mrchlorine Jan 29, 2009

    Hi, thanks for advice. I have checked piston to cylinder clearance and all appears fine as the new piston is 0.5mm oversized its a better fit than one I took out as that was standard with oversized rings. The rod has no up/down movement and shining a torch down into bottom end there are no signs that those bearings have gone and nothing in there that shouldn't be. Obviously I would have to crack it open to check other bearings but surly it wouldn't start if they have failed. So I put it all back together and started it again and the knocking is still there and still not tick over, the only way to describe it would be, it sounds like some thing is rattling about in the cylinder (piston but i cant see that myself) as its brand spanking new. small end bearings look ok and in tack. So I dont know and am short of money so cant take to garage. Anymore Ideas?


  • mrchlorine Jan 30, 2009

    rebored because cylinder was in a bad way, with deep scores and a chunk out of it, been fine since it was done then with running out of oil, the knocking started and with new rings and piston its exactly the same, on inspection i see no damage and a friend says theres none(more experienced than me) but hes stumped too. Piston pin bearing looks ok and all there with normal movement. Is it possible that its worn out and rattling about, but dont get the compression loss! the noise is definitely coming from top end somewhere. I know that lack of lubbrication is BAD, what sort of damage is it likely to cause?

    Hope this helps to help me. Thanks again or your time on this matter.

  • mrchlorine Jan 30, 2009

    sorry you did say could have ruined any bearings. any idea of which ones and how could i tell without cracking it open as i will have to get gasket set and seals just to look. I will prob have to crack open anyway so spose i'll have no choice.

    Thanks again

  • mrchlorine Jan 30, 2009

    Hi thanks again, will get on and do that tomorrow as have had other things on today. Will let you know how I get on.

  • mrchlorine Feb 12, 2009

    Hi, had a lot of snow lately so not been able to work on bike.

    I bought a new cylinder and piston as was cheaper than re-bore and its running absolutly perfect now. Cheers

  • dstar2kuk Apr 10, 2009

    I had the same issue, the oil ran low but didn't run out, the top end started to make a ringing knocking sound and there was increased vibrations felt through the footpegs, I went to the garage 3 times and was told it was just a top end rattle and nothing to worry about, after 2 days of comuting to work with the noise getting worse the engine on low revs started to give a scraping sound, there was no loss of compression and on high revs the bike moved.... I went back to the garage and was told again its just top end rattle! Can anyone shed any light on top end rattle as it felt like the enging was seazing!


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Check the piston to cylinder clearance.You very well could have wore either the piston and/or the cylinder.
Also check the rod for up/down play.Running out of oil could have ruined any bearing in the motor.

Posted on Jan 29, 2009

  • Brad Hurt
    Brad Hurt Jan 29, 2009

    Did you rebore with the oversize piston?How is the piston pin bearing?

  • Brad Hurt
    Brad Hurt Jan 30, 2009

    Before splitting the cases recheck the piston to cylinder clearance with a gauge and take the piston pin and bearing out and mic the pin and check the roller bearings out close.
    That and the rod bearing are most likely to be worn.


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