I'm not certain whether you have Showa or Kayaba forks. My 73 has the former, 85 the latter. I used to be really picky about having the right type, but have since realised it is not that critical. There is just a slight difference in viscosity. Many people experiment with various viscosities to suit their riding style, conditions, preference etc. Some choose to try various automatic transmission fluids. I hope this sheds some light on things. Ride safe Hotrod, and God Bless. Sincerely: Shovelmike. |