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ive got a 2002 kdx 220 an the other day i was riding an i hit 4th an a noise comin from around the piston an after thats it slowly died an never started again someone help asap got trails to hit soon

Well, the obvious questions first: Does the motor still turn over?, is there any compression? Do you have spark? What kind of noise? Hard to help troubleshoot a vaguely worded issue. And posting it multiple times in different threads doesn't get you more responses.

yeah its getting spark, still has compression, still turns over, still gets fuel, and it was a metal on metal type sound it just wont start

Pretty sure your piston broke the skirt. Does it still have the stock piston or did you switch to a wiseco? Could have done damage to the cylinder + ports. Strange that you are still getting good compression readings though. Take the cylinder off and inspect your piston and cylinder wall.

yeah its still got the stock piston an we took the cylinder off an the rings still look good piston still looks fine cylinder still looks smooth dont look like anything happend anywhere

If the skirt broke you would notice it with the cylinder off. Are you sure the sound came from the top end? You took the cylinder off, hopefully you had a manual handy so you didn't damage the KIPS actuator (its got a left hand thread nut). wouldn't hurt to pull the clutch side cover off and take a look . If you have spark, compression, and fuel it will run, it doesn't know any better not to.

no i didnt damage the kips and yes i have a manual and it was a metal on metal contact sound coming from the motor..then it died out an new ran again

Can you post a picture of the cylinder and piston?

What amount of play did you measure in the big end bearing?

id have to take some an i didnt check that but it seemed pretty well there but the piston did have some lay right were it connects to the rod

how was your coolant level when this happened?

everything was fine then all of a sudden it makes that noise and now its not startin