Is there a coating on cylinder of my 01 kx 250 that wears off to make the cylinder usless

You should contact Kustom-kraft.com. They will repair yours. I've sent them 5 so far, and all have come back perfect. $65 for bore/hone.

Torque - 10 mm Cylinder Head Bolt : 49 N·m (5.0 kgf·m, 36
ft·lb)
Torque - 6 mm Cylinder Bolt : 12 N·m (1.2 kgf·m, 104 in·lb)
6 mm Cylinder Head Bolt : 12 N·m (1.2 kgf·m, 104 in·lb)

Cylinder bolts @ 25 ft/lbs (34Nm)
Cylinder head nuts @ 18ft/lbs (25Nm)
Check these nuts again after first warm up and again after first two rides to let gaskets bed in and seal. Cheers.

Best would be to re-ring the piston you have unless it is damaged. To check the cylinder for wear, remove the ring from the piston and use a feeler gage keep using a smaller one till one fits, if less than .005 ok to re-ring. if more than that you might see if you can find a larger piston. one that fits at .0015 -- .0025 is good fit.

If you say it is definately sleeved it should be possible to bore it, you normally get one or two oversizes before it needs resleeving. If you are able to buy an over size piston from kawa or wiseco, chances are it can be bored.

Auto Decompressor Bolt 104 in·lb
Cylinder Head Cover Bolts 87 in·lb
Cylinder Head Bolts: M10 36 S
M6 104 in·lb S

go to this link for a stock head,

http://www.kawasakipartshouse.net/pages/parts/viewbybrand/default.aspx

otherwise try ebay.

check inlet valve clearances. they close up making it hard to start exactly as you described. titanium valve coatings wear and ressesion happens quickly,a clean air filter must be maintained to prevent contaniments wearing valve coatings.

The cylinder bore is just that > the bore size of the cylinder. The piston clearance should be 0.0015 to 0.003. Anything more than .005 and the piston is too loose.

Engine Top End:
Auto Decompressor Bolt 104 in·lb
Cylinder Head Cover Bolts 87 in·lb
Cylinder Head Bolts: M10 36 S
M6 104 in·lb S

the S in that means the specified pattern ... just like tightening car tire bolts... please note all that it its INCH lbs....

don't know why it says just 36 for the M10 bolts unless they left out inch lbs

Anything else let me know as i've got a manual for the 250 f... actually i've got a few different ones

Robert

Please take a moment to rate this solution as i've taken a few minutes to find the manual thanks