Ok heres is some pics of my crank. it looks burn/blackish on top when piston is fully extended is this normal, or should I go ahead a buy the hotrod's crank kit since I'm doing the topend, so its all new as I'm doing a complete restore of the bike for my winter project. If there is something better than the hotrod's crank kit please let me know and should I have anything done to it or just put it in.

3rd.

5th.