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'79 750 Fork Oil Level

crazyramen

crazyramen

Forum Apprentice
Hey yall I'm trying to figure out how much fork oil my bike needs. The service manual I found and the Clymer manual I bought both say 180ml, but it seems to me like that's not right? With the springs in and the forks fully extended I hear gurgling, so that means air is going through the passages along with the oil - I assume that's a sign its lower than it should be, but please correct me if I'm wrong and that's normal.

The fork internals match parts lists I've found for this year, so I think it's the original fork. It's a single disk brake/spoked wheel with the axle at the end of the fork.

I'm used to using a oil height measurement rather than oil qty. Anyone got a reference for that?

Also wondering what wt oil folks are using. The manuals call for 50/50 mix of ATF and 10w-30 so I've been running 20wt fork oil but it seems a bit stiff.
 
Last edited:
20w is too much unless you weight 500lbs & have very stiff springs fitted.... 10w is about right for most, sometimes even 5w or 7.5w if you fit cartridge emulators. :)
 
I went down to 10w. It's definitely much better.

I couldn't for the life of me remember where I heard 20 wt was a good replacement but then I realized it was in the clymer manual. I can only assume they meant if for folks riding two up or with lots of luggage
 
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