Way to dig up the dead...hahaha

http://www.gz250bike.com/forum/showthread.php?t=16 - Needle Shim Mod

http://www.gz250bike.com/forum/showthread.php?t=20 - Muffler Swap (Jetting info)

http://www.gz250bike.com/forum/showthread.php?t=551 - GZ250 Power Increase

Thanku so much for this jonathan

Hey there is a company called sigma6 that does custom jet kits,ordered mine for a little under 60 bucks and it comes with detailed instructions, worked like a champ on my bike.