adding washers will put the stock springs in "more" tension and may make your stock valve springs prone to early coil bind ( you have shorten the compression travel of your spring.) rather than in the "normal" compression state. an upgrade is better than a backyard do it yourself and end up catastrophic engine damage. ouch!!is it possible to use washer on stock valve spring and valve to make it stiffer ?
which want in vixion??Vixion Valve Spring users here. We installed the Vixion springs on two snipers----2010 and MX. Two different set ups but one after effect....more silent engine with higher rev limit and speed per gear. Tried LHK aftermarket springs which were taller than stock but apparently couldn't handle the Turbo cam. It seemed then that stock was better. Vixion on both bikes now.
See the comparison of the LHK valve spring (left, longer and thinner) with the Vixion valve spring (right, slightly shorter but thicker).
Faito Bore kit
Faito Turbo cam
Big Valve head
Namban Pipe set
thanks Trax (hehehe)
old cam from the 2010 (unknown)
So far, so good. Hope this helps