what would be better for trails and messing around a 4mil or a 404 bigbore for my banshee i have toomey t5s v2 reeds and k&n filter and the bike is getting tired so i want to rebuild it and im not looking for a bike thats gonna tear my arms off at 80mph i want somthing that has power around midrange and i was wondering if a longer stroke or a bigger bore would be better