2007-2008 Yamaha Phazer Venture-Lite 500 Factory Service Manual, Page 82Get this manual
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REAR SUSPENSION Spring preload 1 Adjust: Spring preload
PZ50FX Spring seat distance Preload Length Standard Shorter Harder Min180 mm (7.09 in) 190 mm (7.48 in) Longer Softer Max190 mm (7.48 in)<