These are high performance fuel injector which are direct replacements for the YFZ450r ATV's and YZ450f Dirt Bikes. They will work on all years from 2009 and newer, and are available in the following sizes:
375cc = OEM Replacement
450cc = +20%
550cc = +46%
650cc = +73%
750cc = +100%
850cc = +126%
1000cc = +166%
