Pre 2003 suffered with failing auto cam chain tensioner so change it for a manual one or a newer post 2003 auto cam chain tensioner as in 2003 Suzuki updated the ACCT to utilize a ratcheting mechanism, which prevents the tensioner from retracting in the event of spring failure
Must haves if i was going
case savers both side
Radiator guards
good bash plate
larger fuel tank (i prefer the IMS 17L tank to the others)
wider seat
hand guards
Loctite all bolts associated with the stator as they come lose and the stator fails, for your long trip take a spare stator to be safe
if this is a new bike then when you do a oil change check there is still a small rubber o ring sitting inside at the back as alot of people forget about this, make sure there is a copper washer on the sump drain bolt
oil change at 3000 miles max, check oil daily also 10/40w semi syn, clean and oil air filter if traveling in dusty areas and wash it often if dirty..... as if sand gets in it will need a new barrel and piston
nice to haves
wider foot pegs
bar risers you can move forwards and back
small plastic wind shield
metal oil filter so it saves you carrying lots of spares, also filters finer
better headlight as the standard headlight is crap but if you don't ride at night don't worry about it
Standard forks/shock are fine if you set them up right and you travel light, that's is on the S model as the SM model (USD forks) fitted with 18/21 is shocking to ride and handles crap
Also the 3x3 airbox mod with correct jetting & aftermarket pipe/can is a noticeable difference in power and worth it but depends if you care really as fine without