YX 150/160 & Z155 valve springs 10% stronger
New option for 1.9mm base shim kit to improve preload.
Specifications OUTER SPRING:
Length: 29.2mm
I/D 18.8mm
O/D 24.0mm
Wire Guage: 2.5mm
Specifications INNER SPRING:
Length: 24.7mm
I/D 12.0mm
O/D 15.6mm
Wire Guage: 1.6mm
When fitted to the Z155 they make a big difference to the top end revs, some cases they and add 2000 rpm more