The 10th digit on Suzuki should be the model year. Also, the 2002 KQ300 was the first year with disc brakes on the front. Prior to that both the front and rear brakes were drums. So if you have discs, then it's a 2002 or newer - drums would make it a 2001 or older model.
I can't remember how long they kept the KQ 300 in production - 2003 or 2004 I think.
'07 Can-Am Outlander 800 XT - Crutchfield stage I Extremes all around
'02 Eiger 5-speed / mudlites
Past bikes: '89 Warrior, '97 Warrior, '98 LT80, '94 King Quad 300, '84 LT50