FMF Spring and O-Ring Kit RM 125 1997-2007 011313 FMF011313 Geometry Hat tunes and adjusts your air/fuel

tunes and adjusts your air/fuel ratio for peak performance instantaneously Can fine-tune the non-acceleration air/fuel curves using the Bluetooth® app Works with stock or modified engines

- 2000-2002 Yamaha YZ 426 F Back: 2000-2002

Polyurethane roller with 98A durometer harness for long life

This design is the most efficient mating of exhaust gases to help generate more power Rear cylinder header pipe runs forward and wraps around the ignition cover for a sleek look and more clearance for the oil dip stick Heat shields cover the exhaust headers and the collector nestles beneath a simple cover Made in the U

New TPR heel counter design ensures additional lateral support and security

FMF Spring and O-Ring Kit RM 125 1997-2007 011313 FMF011313 Geometry Hat tunes and adjusts your air/fuelSpring and O ring kit for exhaust pipe