Light Weight RDR Chrome Silicon Steel Alloy Valve Springs for 50cc, 125cc, and 150cc GY6 and GY6B 4-stroke engines. Rated for 12,000 RPM. The lighter your valve train components, the quicker the engine will rev.

• Includes 2 Inner and 2 Outer Valve Springs
• Outer Spring Weight: 14g
• Inner Spring Weight: 7g
• Coil Diameter Outer Spring: 2.54mm
• Coil Diameter Inner Spring: 1.95mm
• Outer Spring Height: 37.3mm
• Inner Spring Height: 27.3mm
• Made in Taiwan

GY6 QMI/QMJ 152/157