Compatible with Yamaha models
Big Bear 400 YFM400 2x4 4x4 2000-2012

Part Number:
Exhaust Valve: 1UY-12121-01-00, 1UY-12121-00-00
Inner Valve Spring: 1UY-12113-01-00, 22U-12113-00-00
Outer Valve Spring: 1UY-12114-01-00
Outer Valve Spring: 1J7-12119-01-00, M01-12129-00-00
Valve Stem Seal: 1J7-12118-00-00

Dimensions & Measurements:
Exhaust Valve:
Exhaust Valve Length: 1.33" | 34.0 mm
Exhaust Valve Diameter: 3.93" | 100.0 mm

Inner Valve Spring:
Width: 0.84" | 21.4 mm
Height: 1.55" | 39.6 mm
Thickness: 0.11" | 2.9 mm

Outer Valve Spring:
Width: 1.22" | 31.2 mm
Height: 1.71" | 43.5 mm
Thickness: 0.16" | 4.25 mm

Outer Valve Spring:
Length: 0.47" | 12.0 mm
Width: 0.35" | 9.0 mm
Inner Diameter: 0.18" | 4.7 mm
Outer Diameter: 0.37" | 9.4 mm

Valve Stem Seal:
Width: 0.16 " | 4.2 mm
Length: 0.37 " | 9.5 mm
Height: 0.27 " | 7.0 mm