Hi Don.
Your kick starter spur and idler gears are most likely bad.
Possibly your shaft as well.
As an assembly you want to look at 99-01 KX250.
13066-1099 SHAFT-KICK fits 99-01 kx250
59051-1271 GEAR,KICKSTARTER IDLE fits:
1987 KX250-E1 KX250
1991 KDX250-D1 KDX250
1992 KDX250-D2 KDX250
1993 KDX250-D3 KDX250
1993 KX250-J2 KX250
1994 KDX250-D4 KDX250
1994 KX250-K1 KX250
1995 KX250-K2 KX250
1996 KX250-K3 KX250
1997 KX250-K4 KX250
1998 KX250-K5 KX250
1999 KX250-L1 KX250
2000 KX250-L2 KX250
2001 KX250-L3 KX250
2002 KX250-L4 KX250
2003 KX250-M1 KX250
2004 KX250-M2 KX250
2005 KX250-R1 KX250
2006 KX250R6F KX250
2007 KX250R7F KX250
59051-1339 GEAR-SPUR,KICK STARTER
1998 KX250-K5 KX250
1999 KX250-L1 KX250
2000 KX250-L2 KX250
2001 KX250-L3 KX250
2002 KX250-L4 KX250
2003 KX250-M1 KX250
2004 KX250-M2 KX250
2005 KX250-R1 KX250
2006 KX250R6F KX250
2007 KX250R7F KX250
Thanks!
SB