KX125   Kit includes
1 head body, 2 domes, 1 o-ring kit
5 acorn nuts (1995-2002) 5 copper washers
Head brackets

Order your kit from parts listed below

1995-2002 Head body
2003-2007 Head body

OS1 o-ring kit 1995-2002
OS11 o-ring kit 2003-2007 same as OEM o-rings

KB1 head brackets 1995-2002
KB3 head brackets 2003-2007

1995-2002
Dome selection flat top piston (see note)
H11 8.2cc
H12 7.6cc
H13 6.7cc
H14 5.8cc

1995-2002
Dome selection radius top piston (see note)
K11 9.2cc
K12 8.5cc
K13 8.2cc
K14 7.6cc

2003-2007
Dome selection radius top piston (see note)
Y11 10.0cc
Y12 9.3cc
Y13 8.8cc
Y14 8.1cc

2003-2007
Dome selection flat top piston (see note)
F11   7.8cc
F12   6.9cc
F13   6.0cc
F14   5.2cc

Note
Heads colors are red, blue, black, gold and aluminum
KX125 1998-2000 stock with flat top piston
KX125 1995-1997 & 2001-2001 stock with radius top piston The H11 or K11 domes are closest to stock compression these domes use o-ring seal, the max bore is 56mm

KX125 2003-2007 Y1 series domes stock with radius top piston
KX125 2003-2007 F1 series domes for flat top piston
Flat top or Radius top pistons will work in all KX125 provided matching dome is used
Y11 domes are closest to stock compression and use o-ring seal, the max bore is 58mm
Dome modification for big bore available see FAQ