What are primary fluids in a motorcycle?

I asked my friend for a list of DIY motorcycle repairs I can do for my bike. He said transmission, oil change, primary fluid change, etc.

I've managed to find a tutorial on hwo to do all of thse things except for 'primary fluids'. I can't figure out what that even is. He is a harley davidson guy and I know that harleys have something called primary fluids, but when I search primary fluids for my Honda Sabre 1100cc (2007), I don't get any results.

Any ideas? Thanks.

PS I realize I was driivng around without any brake fluid and very low and bad quailty transmission gear oil. Thankfully changed that as of last night.

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