Hi thanks for the post and feedback.
What you see is a stock KX 500 with some minor mods to the head.
Head Mod, has additional ANA fitting welded in for cooling burb tank. ( radiator is under the nose.) Head has been milled a little not sure how much will find out when I tear it down end of the month. ( I have one more race this weekend. Actually my 13 year old son races it!!!!!!)
Plan ( build up second motor I have spare with bad rod bearing at the crank.)
ISO lower rotating assembly.
I'll post some pics of my other pro-circuit ported / steel sleeve cylinder this weekend.
I have a new wiseco 87mm Piston I will be using with ported cylinder and mod head. That's my start for now.
Thanks.