KX80/85/100  Kit includes
1 head body, 2 domes, 1 o-ring kit
5 acorn nuts, 5 copper washers

Order your kit from parts listed below

1992-2010 Head body

OS12 o-ring kit fit all years

54.5mm head gasket kit (optional)

KX80/85
Dome selection (see note)
K01 or W01   6.4cc
K02 or W02   6.0cc
K03 or W03   5.6cc
K04 or W04   5.2cc

KX100
Dome selection (see note)
K40 or W40   6.9cc
K41 or W41   6.4cc
K42 or W42   6.0cc
K43 or W43   5.6cc

Note
Heads colors are red, blue, black, gold and aluminum
K01 dome is closest to stock compression KX85
K40 dome is closest to stock compression KX100
K1 and K4 series domes use o-ring seal, the max bore is 52.5mm
W0 and W4 series domes use a head gasket, the max bore 54.5mm
54.5mm Big bore head gasket kit optional
Dome modification for big bore available see FAQ