Big Bore Kit, for more torque and more power, fits on 250 SX-F and EXC-F (XC-F/XCF-W) models.
Jetting Recommendation idle jet: 42 jet needle: OBETP - 5th position from top main jet: 168 leak jet: 70 air screw: 1,25 turn open pump spring: green (SXS08250030)
2011-2012 250 models with EFI must use JDKTX02
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