New to XJ600 and need some info ?

[Jake6271-1992XJ6]

I just bought a 1992 XJ 600 and have been cruising it around in a near stock condition. " Stock with a V&H exhaust, K&N filter "
But the guy I bought it from had install a V&H exhaust and had put around 3,000 miles on it without Jetting the Carbs... when I bought it I installed a Stage 2 DynoJet kit and all seems well but this winter I'm planing to do a major overhaul and do some repainting and repair on a few minor issues that the bike has but one of the more prominent issues was the lack of re-jetting "seriously lean " and extensive riding so I'm planning on freshening up the top end. " new rings and seals and such "
I've been looking all over the net trying to see if there are any aftermarket performance parts available for this model Yamaha and it seems to be a next to impossible thing to find.
I was hoping to find a better camshaft for when I rebuild the top end and maybe better valve's or basically anything i can do as an improvement, and I've found nothing.
Do any of you have any place's you can direct me to for replacement and aftermarket parts for this bike that i can look into????
Any info i can get will be a great help.