part 1
e|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|---------------------------------------------------------------------------|
D|-6------7------11----------------------------------------------------------|
A|-x-(x12)-x-(x4)-x--(x4)----------------------------------------------------|
E|-4------9------9-----------------------------------------------------------|

part 2

e|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|---------------------------------------------------------------------------|
D|-6-------14-------13-------------------------------------------------------|
A|-x-(x12)--x-(x4)---x-(x4)--------------------------------------------------|
E|-4-------12-------11-------------------------------------------------------|

the timing is real easy. just listen to the song, they change between riffs usually in 
last verses and the chorus.