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Straight Valve Stem - TR4
this assembly ensures consistent
the kit includes the 43mm cylinder bore and piston assembly needed to complete the swap
Radius ground and edge trimmed for uniform drum contact
Engine Compatibility: GY6 125/150cc (Long Case)
RDR Chrome Silicon Steel Alloy Valve Springs rolf Straight Valve Stem - TR4RDR'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
