Motocross Valve Stem Size: 4.5 mm Diameter (A): 17.47 mm Out Step Diameter (B): 11.81 mm References: Exhaust (2 pieces). Single Spring-7 Degree Pro CNC Ferrea Racing Spring #S10140
Motocross Valve Stem Size: 5.0 mm Diameter (A): 17.78 mm Out Step Diameter (B): 13.25 mm References: Intake (2 pieces). Single Spring-7 Degree Pro CNC Ferrea Racing Spring #S10139
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