Kibble White Light Race Valve spring kitYAMAHA 250 YZ 250 F (CG40) - 2019Ref : KIBW00168A / 09263176

KIBBLEWHITE – Lightweight Race Spring Kit (manufacturer part no. 80-82300)

Complete valve spring pack specifically designed for motocross. This kit includes the essential distribution components: chrome-silicon intake and exhaust springs, titanium upper cups, and high-temperature steel base washers. A lightweight and robust choice for standard or oversized engine cylinder heads. The keys are not included.

• Contents: 2x CrSi intake springs, 2x CrSi exhaust springs, 2x titanium intake cups, 2x titanium exhaust cups, 2x high-temperature steel base washers for intake, 2x high-temperature steel base washers for exhaust.
• Installation Heights: intake 1.315" (≈33.4 mm), exhaust 1.160" (≈29.5 mm).
• Spring Height / Lift Imperial: intake 0.420" (≈10.67 mm), exhaust 0.400" (≈10.16 mm).
• Materials: Chrome-Silicon springs, titanium collars/cups.
• Origin: made in the United States.
• Application: intake and exhaust — Lightweight Race model, suitable for motocross bikes (e.g. YAMAHA YZ 250 F 2019).

Ideal for builds where a lightweight and durable distribution set is sought: titanium to reduce rotating mass, CrSi for fatigue resistance. Installation is recommended by a motorcycle mechanic to ensure installation heights are respected and to guarantee optimal cylinder head operation.