MOTORCYCLE KIT 2 + EXHAUSE 2 + SEALS 4 for CFMOTO 250SR 250NK 250CL-X NK250 SR250 NK SR 250 CLX matched Fit For CFMOTO 250SR 250NK 250CL-X single cylinder engine cylinder head assembly; complete set contains 2 valves, 2 valves 4 oil seals for one-stop overhaul Direct bolt on installation; no or extra during engine , match guides, seats springs temperature body with surface treatment; resist deformation under continuous RPM sport riding to avoid leakage power loss Elastic fluororubber oil seals with good resistance; block infiltration into combustion chamber to reduce blue oil consumption OEM consistent dimensional accuracy; restore standard engine compression ratio to solve weak acceleration, hard cold start abnormal failures