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'78 GS750 fork oil level/air gap

M

Mary Hinge

Forum Apprentice
As part of the recommissioning check list I wanted to change the fork oil. I appreciate that I might need/benefit from new springs too at some point but until I get some miles on her I'm not able to tell. I've found the capacity spec (180cc) in the workshop manual link Nessism kindly posted for me which I assume would be the amount needed if the forks have been completely stripped & dry which mine won't be as yet. Would anyone be able to advise on the oil level/air gap with springs in (or out) for this model please, many thanks.
 
Mary Hinge said:
As part of the recommissioning check list I wanted to change the fork oil. I appreciate that I might need/benefit from new springs too at some point but until I get some miles on her I'm not able to tell. I've found the capacity spec (180cc) in the workshop manual link Nessism kindly posted for me which I assume would be the amount needed if the forks have been completely stripped & dry which mine won't be as yet. Would anyone be able to advise on the oil level/air gap with springs in (or out) for this model please, many thanks.
Click to expand...
If there's a spacer set the air gap to 120mm. If it's all spring, set it to 140mm. That's measured with the spring and spacer (if any) removed and forks fully compressed.
 
Honestly, don't worry about the air and instead get some Sonic Springs straight-rate springs and 10w oil. The air that is naturally in the tubes is all you'll need.
 
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