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There are various levels for the 1979 RM125N Air Fork Oil Capacity Standard 392mm - approx 13.2 US Ounces Low Level 376mm High Level 424mm
274ml of sae5w/20
use 15wt or 20 wt fork oil and add 259mm per fork for an 1979 gs1000s
Use 10 ounces for each fork. Less if you want softer suspension, perhaps 8 ounces.
I have a Clymer Suzuki LS650 manual '86-'04 (Copyright 2005) and on page 277 it says to add 441 cc (14.91 oz) of DEXRON ATF or SAE 15W fork oil. It also says to hold the fork assembly verticle and use an oil level gauge to get the correct level of 75mm (2.95 in).
vl250 fork oil quantity
gr650 is 8.9 oz.per fork, gr650x is 7.8 oz.per fork
14oz per fork
227ml per fork
521 ml SAE10. Or 97 mm level with compressed forkleg without spring.
The front fork tubes in a 1996 Suzuki Intruder VS 800 are 40mm.
644 millilitres per fork leg