hi .i searched the archives and went to google but souldnt find much ....over the winter im planning on building a 4m strocker and i was looking for some stock jugs but them i was introduced to some big bore jugs and i know nothing about them ,,,so i was hoping that someone could give me some info . will my stock carbs and intake fit? will a cool head fit? and the big bore is 69mm is that std. for a big bore? would it be okay to run like a 4mm long rod stroker with a cool head and 20 or 21 cc domes . stock carbs for now....................what would your reccomendations be on the dome size and carb type im looking to build a great trail bike and a nice and fast ride . i live near a straight away and i race people around here and i would love to beat them all. so it would have to be a mixture of trail and drag any and all info is appreciated .