I know yamaha recommends the 01 for my year of bikes forks but ive been using the S1 for 7 years and have had not one issue it works great and its 0 weight which is what yamaha recommends for their forks. I was kinda curious to use some maxima 5wt racing fork oil but still have not tryed it, i do run maxima 3wt racing shock oil in my shock and i am very happy with it. Anyone Let me know if you've tryed the maxima stuff in the forks and how it works. I MX track ride and free ride in the desert and hills
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A little expensive
Other than the Honda 0 weight oil, this is your only other option.
Run heavier oil and suffer broken free Pistons.
Ask me how I know ?
Meets R6 OEM specs for OEM spring rate and valving.