Valve Spring

Free Length (approx.) 47.65 mm (1.876 in.)
Spring Tension
Valve Closed 271 to 307 N @ 41.656 mm (61 to 69 lbf. @ 1.64 in.)
Valve Open 818.5 to 871.9 N @ 30.89 mm (184 to 196 lbf @ 1.216 in.)
Inside Diameter 21.00 mm to 21.51 mm (0.827 to 0.847 in.)