| engine size | model | year | best | better | good | standard |
|---|---|---|---|---|---|---|
| 450 | YFM45FG Grizzly | '07-'11 | YTX14AH | - | - | - |
| YFM45FX Wolverine | '03-'10 | PC545 | YTX20HL | YTX20L | - | |
| YFZ450 | '04-'09 | - | YT7B | - | - | |
| YFZ450X | -'08 | - | YT7B | - | - | |
| YFZ450R, X | '09-'11 | YTZ7S | - | - | - |
| engine size | model | year | best | better | good | standard |
|---|---|---|---|---|---|---|
| 450 | YFM45FG Grizzly | '07-'11 | YTX14AH | - | - | - |
| YFM45FX Wolverine | '03-'10 | PC545 | YTX20HL | YTX20L | - | |
| YFZ450 | '04-'09 | - | YT7B | - | - | |
| YFZ450X | -'08 | - | YT7B | - | - | |
| YFZ450R, X | '09-'11 | YTZ7S | - | - | - |
