ho deciso di mettere una pulleggia alleggerita come questa, in questo forum ne parlano bene:
http://www.g2autosports.com/products-crankpulley-yaris.html
http://www.yarisworld.com/forums/showthread.php?t=4737
http://www.g2autosports.com/products-crankpulley-yaris.html
http://www.yarisworld.com/forums/showthread.php?t=4737