RDR Chrome Silicon Steel Alloy Valve Springs rolf First oversize replacement piston ring

First oversize replacement piston ring for the the PCK1 P200 Polini kit

Radius ground and edge trimmed for uniform drum contact

Engine Compatibility: GY6 125/150cc (Long Case)

Straight Valve Stem - TR4

making it easier for shorter riders to plant their feet firmly at stoplights

RDR Chrome Silicon Steel Alloy Valve Springs rolf First oversize replacement piston ringRDR's Chrome Silicon Steel Alloy Valve Springs for 139QMB 50cc 4 stroke and 125 150cc GY6 and GY6B 4 stroke engines are rated for 12,000 RPM. The lighter your valve train components, the quicker the engine revs. Specifications: 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