Yamaha Cooling water update serial number range:
VF200LA 6CDL-1000001 ~ 1000099
VF225LA 6CCL-1000001 ~ 1000241
VF250LA 6CBL-1000001 ~ 1000589
Yamaha Thermostat Gasket update serial number range:
VF200LA
6CDL-1000001 ~ 1000339
VF225LA
6CCL-1000001 ~ 1000457
VF250LA
6CBL-1000001 ~ 1000884
F225XCA
6CLX-1000001 ~ 1000213
LF225XCA
6CMX-1000001 ~ 1000036
F250XCA
6CGX-1000001 ~ 1000598
F250UCA
6CGU-1000143 ~ 1000528
LF250XCA
6CHX-1000001 ~ 1000190
LF250UCA
6CHU-1000051 ~ 1000168
F300XCA
6CEX-1000001 ~ 1000868
F300UCA
6CEU-1000011 ~ 1000830
LF300XCA
6CFX-1000031 ~ 1000407
LF300UCA
6CFU-1000021 ~ 1000348
If your serial number falls at or between the listed serial number ranges, contact your local Yamaha dealer to have the update performed.