Report "2003 RM 250 THE BIKE HAD 15-20 HOURS ON IT FROM NEW.I THEN DID A TOP END JUST RINGS.I BROKE THE NEW RINGS IN AND I PUT 8 HOUR MORE ON THE BIKE AND SHE LOCKED UP.AFTER A NEW CYLENDER AND PRO X PISTON & RINGS I SEATED THE RINGS THEN DID 2 10 MIN. BRAKE INS LET THE BIKE COOL EACH TIME.I STARTED ON A 20 MIN BRAKE IN AND SHE LOCKED UP AGAIN.I HAVE FLUSH THE CRANK EACH TIME AND THE CRANK IS TIGHT(AS GOOD TIGHT).I HAVE BEEN WORKING ON 2 STROKES FOR YEARS BUT THIS ONE HAS GOT ME! THE RING SNAGS THE BRIDGE ON THE IN TAKE PORT THE FIRST TIME ON THE LEFT THE SECOND TIME ON THE RIGHT.SOME ONE SAID THAT A SINGEL RING YZ 250 PISTON & RING WILL FIT AND THAT MIGHT DO THE TRICK ?"