Thank u so much for all u suggestions,
Fo cooling the bike i have choosen one of the solutions from that forum, oil cooler made by Mark, i will test it on my old engine and ifnall is fine I will mount it to the race one.
Subframe, i had feeling thatbit has to be stronger but i did not know how to do it. May be do u have some pics from u old bike???
I was thinking to make subframe detachable from the main frame bu im a lit bit worry how strong it may be? Stronger and stiffer then welded version?