Every guitarist have their own especial technique, that they use alot in their solos. Most people know Kirk Hammett because of his huge use of wah pedal. But it's not just pushing wah pedal and playin some strange riffs. There's some riffs that Hammett use alot in his solos, so if you like his riffs and metallica solos here is some riffs for you.
Lets start from old stuffs, although some of them compose by Dave Muastine too, but kirk also edit them.
Playing Scale:
here is some scale that you can hear alot in kill 'em all, alomost in all songs of that album, and also in other albums. This not much hard to play that but most important thing is to play it really fast and be careful about timing because being fast without control is nothing, and also pull off is important too.
|-17-p14------14--17-p14------------------------------------------|
|---------17--------------17--14------14--17-p14------------------|
|---------------------------------16fb------------16--14------14--|
|---------------------------------------------------------16------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-16-p14----------------------------------------------------------|
|---------16--14------14--16-p14----------------------------------|
|-----------------16--------------16--14------14--16-p14----------|
|-----------------------------------------17--------------17--14--|
This stuff play in different scale for example in "hit the light" in outro solo kirk play that in this scale too:
|-22-p19------19--22-p19------------------------------------------|
|---------22--------------22--19------19--22-p19------------------|
|---------------------------------21fb------------21-and so on ...|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
Another old riff is here, it use in "no remorse" and some other songs and also in different scale too. This riff is really simple.
|-17-p14------14--17-p14--19-p14--17-p14------14--17-p14--19-p14--|
|---------17------------------------------17----------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
or in "the four horsemen" it play like this:
|-15-p12------12--15-p12--15-p12------12--15-p12--15-p12------12--|
|---------15----------------------15----------------------15------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
:
If you want to play "wiplash" solo except those riff you need to play this riff fast, all open notes are pull off.
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-2p0h2p0-4p0h4p0-5p0h5p0-4p0h4p0-5p0h5p0-7p0h7p0-9p0h9p0-7p0h7p0-|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
or in "blackened" it use different
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-12p0-12p0-12p0-12p0-12p0-12p0-11p0-11p0-9p0-9p0-9p0-9p0-9p0-...-|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-16p0-16p0-16p0-16p0-16p0-16p0-14p0-14p0-12p0-12p0-12p0-12p0-...-|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
:
Another thing that you have to know is fast bending, here is a riff from "fade to black" outro solo, pull of notes can help you alot to play this riff fast, but timing is important because bending notes may reduce your speed.
|-------------------------------------7---------------7-----------|
|-----7---10-p7-------7---10-p7-----------10-p7-----------10-p7---|
|-9fb-------------9fb-------------9fb-------------9fb-------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
or in "battery" middle solo
|-14-p12------12--17-p12--15-p12--14-p12------12--17-p12--15-p12--|
|---------15fb----------------------------15fb--------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
:
Alternative is very important in all solo, this is a riff that use in "call of ktulu" and also in different scale in other songs too, I show you upstroke and downstroke, to play this you can separate every 4 notes, and then keep playing them togather. Every time that you play, try to play it faster.
v ^ v ^ v ^ v ^ v ^ v ^ v ^ v ^
|-12--10--9-------10--9-----------9-------------------------------|
|-------------12----------12--10------12--10--9---12--10--9-------|
|-------------------------------------------------------------11--|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-10--9-----------------------------------------------------------|
|---------11--9---13--11--9-------11--9-----------9---------------|
|-----------------------------12----------12--11------12--11--9---|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-12--11--9-------11--9-----------9-------------------------------|
|-------------12----------12--11------12--11--9---12--11--9-------|
|-------------------------------------------------------------12--|
This one is from "fade to black" outro solo, it's little harder.
v ^ v ^ V ^ V ^ v ^ v ^
|-10---8----7-----8----7----------7-------------------------------|
|---------------------------10---------10---8-----10---8----7-----|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-8----7----------7-----------------------------------------------|
|-----------9----------9----7-----9----7----6-----7----6----------|
|-----------------------------------------------------------9-----|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
:
Oscourse it's half sweep picking but it sound great and hard to play it. It's part of "leper messiah". Timing is important because playin first 3 notes are easy but 3 last one may reduce your speed, for playing that you need to do sweep picking technique.
|-19--p15-------------------15----19--p15-------------------15----|
|-----------17---------17-------------------17---------17---------|
|-----------------16------------------------------16--------------|
|-----------------(sweep picking)-----------------(sweep picking)-|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-20--p17-------------------17----20--p17-------------------17----|
|-----------18---------18-------------------18---------18---------|
|-----------------17------------------------------17--------------|
|-----------------(sweep picking)-----------------(sweep picking)-|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
|-22--p20-------------------19----22--p19-------------------19----|
|-----------20---------20-------------------20---------20---------|
|-----------------19------------------------------19--------------|
|-----------------(sweep picking)-----------------(sweep picking)-|
|-----------------------------------------------------------------|
|-----------------------------------------------------------------|
:
Tapping is a great technique that is not much hard but it sound really great and fast so if you want to surprise others learn this technique, it's a part of "one" outro solo, notes that marked with T, play with right hand you can play them with edge of your pick or your finger no different it depends on you. You just need to hit the marked fret with right hand and left hand just do pull off notes.
|-19p15p12-19p15p12-19p15p12-19p15p12-20p15p12-20p15p12-20p15p12-20p15p12-|
|-T--------T--------T--------T--------T--------T--------T--------T--------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
tapping can be little be hard too, for example this part from "where ever I may roam".
|-17p16-17p16p13p12-17p16-17p16p13p12-17p16-17p16p13p12-17p16-17p16p13p12-|
|-T-----T-----------T-----T-----------T-----T-----------T-----T-----------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
:
It's time for new stuff, lets go to death magnetic, a simple riff that hammett ust alot in this album is here, for playing that your first finger take 2 first strings and 2nd and 4th finger play other notes. (i mean 7th fret take by first finger and 8th fret with 2nd finger, and 10th fret with 4th finger) try to plat it really fast.
|-10p8p7--------10p8p7--------10p8p7--------10p8p7------------------------|
|--------10p8p7--------10p8p7--------10p8p7--------10p8p7-....------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
now try to move it
|-10p8p7--------11p9p8--------12p10p9---------13p11p10--------------------|
|--------10p8p7--------11p9p8---------12p10p9----------13p11p10-...-------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
Another stuff that play random by kirk is here, if you use wah pedal it can sound great. Separate every 3 notes, and then play them togather, you have to play all notes with same speed, so don't forget timing.
|-22-21-20-21-20-19-20-19-18-19-18-17-18-17-16-17-16-15-...---------------|
|-(3notes)-(3notes)-(3notes)-(3notes)-(3notes)-(3notes)-------------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
|-------------------------------------------------------------------------|
So as you can see kirk is not just use wah pedal, there's a lot of riffs that you can practice them to improve yourself, I'm just mentioned some of them.
/ my profile 
.