Honda ATC 250R 1986 OEM Stock Cylinder and Head. Approximately 66.50 MM Bore. Looks to be un-ported. Date stamp 85 with HA2. 
 I am not a mechanic by trade and recommend a Dealer or other professional inspect these parts before being installed.
         Please look at all Pictures and ask any Questions.
ITEM # 091705
       Reasonable Offers Considered
I ship UPS and USPS, sometimes FedEx.  I always combine items when possible and will refund a combined shipping cost when applicable. I DO NOT SHIP TO POST OFFICE BOXES.