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According to the Yamaha Service Manual 17.6 US oz/18.3 Imp oz per fork is the standard capacity.
r1 fork oil capacity
750 Ml or 0,75 Liters
fork oil capacity for a 2009 yz450f is 6.73 us oz recommended oil is Yamaha suspension oil "S1"
fork oil amount yamaha thunderace
Lance's Haynes manual says: Capacity: 555cc, Type: Yamaha fork oil "01" or equivalent
238ml per fork
2.33 Ounces
20.5 oz
On a dry fill it's 800 mil, for an oil change 750 mil
482 cm3
440 cc