hey guys, i am doing a complete top end on my 2009 kxf 250. I am ordering all my parts off Bto sports and am stuck as to what to get in terms of valves and piston kit. I have the choice of std compression in the piston kit, or 14:1, and 78mm gaskets and 79mm gaskets.. (what is the difference and will all of them fit if i was to by either one) The second thing is that i need to do my valves (whole reason i am going into the engine and why i decided to do my top end while i am there). will this valve kit ( http://www.btosports.com/p/FMXIK ) be all i need or is there other seals etc i need to buy separately to fully do them?? I was also told that i need a new cam chain as it had stretched and they could not tighten it properly. WOuld there be anything else i need like Cam shafts etc??? Basically i am trying to order all this stuff for when my dad gets home so he can rebuild it with me. CHeers guys and thanks for your time.