I HAVE A 330 ESR CYLINDER AND HEAD OFF A TRX250R.  THIS IS SETUP FOR A +5 STROKER CRANK FOR 344CC. THIS HAS AN  AGGRESIVE PORT JOB AND WAS RUNNING ON METHANOL.  THIS HAS THE ORIGINAL SLEEVE AND STILL ON THE 1ST BORE. This came off a running motor. THIS WILL WORK ON THE 1986-1989 TRX250R AND THE 1985-86 ATC250R. PLEASE SEE PICTURES FOR CONDITION. DON'T FORGET TO CHECK OUT MY OTHER ITEMS FOR SOME MORE GREAT TRX250R PARTS. THANKS CVETKO