I HAVE 1986 KX 250 CYLINDER HAS MARKING 0249l. I WAS WOUNDERING IF OTHER YEARS FIT THE 86 , I WAS TOLD 85 HAD SAME MARKINGS ON IT. I READ 86 AND 85 HAD BORE OF 70.00MM AND 87 MIGHT HAVE SAME DESIGN BUT A SMALLER BORE 67.40MM. I DID NOT MEASURE MY CYLINDER BORE BUT THE WISECO 70.00MM PISTON SEEM TIGHT (not enough clearence)I DID NOT CHECK PISTON YET ALSO . SO QUESTION 86 DESIGN SAME AS 87 EXCEPT FOR BORE SIZE OR AM I BEING MISINFORMED? AND I WAS ALSO TOLD 87 HAD SAME MARKINGS ON IT. I HAVE NO KAWASAKI DEALER IN TOWN WITH ECONOMY THEY SHUT DOWN AND OTHER SHOP DO NOT SELL DIRT OR MX BIKES