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Fork oil level

I think I may have asked this before but got involved with other stuff and now I don't remember.... must be having a senior moment. 🙂
Any way my rig is a 1994 gl1500 with a csc friendship 3. It has the 6 degree rake and extended tubes. I think they are 2 inches longer. All this was done by csc.
It seems to me that when changing fork oil that more oil would be needed then the stock amount as there is now 2 more inches of air to compress which would make for a very mushy ride. So does anybody know how much more oil would be needed ? Or am I not understanding something ??? 🙂

Not sure on that particular application, but back in the day I had longer forks, and used the same measurement from the top. That indeed resulted in more oil, but how much more I couldn't say.

I'm not a Gold Wing guy, but it seems to me like if the oil level is good the way is is right now, and the forks are not leaking, simply measure the amount of oil you pour out of each fork. Then put the same amount back in, plus a "dab".

Jeff_Online - 4/24/2018 10:54 AM

Not sure on that particular application, but back in the day I had longer forks, and used the same measurement from the top. That indeed resulted in more oil, but how much more I couldn't say.

Hi Jeff. yup I'm pretty sure it needs more oil but my forks have a schrader valve on the top and that makes changing oil really easy as I don't have to deal with trying to compress that horrendous spring to get the cap back on. "I are 98 lb weakling" hahaha 🙂

DRONE - 4/24/2018 2:06 PM

I'm not a Gold Wing guy, but it seems to me like if the oil level is good the way is is right now, and the forks are not leaking, simply measure the amount of oil you pour out of each fork. Then put the same amount back in, plus a "dab".

Hi Drone. Not sure about the oil level being right as it was VERY stiff. I added the stock amount of oil in each tube and now it was very soft, to soft!! I added 1 oz or 30 cc's to each tube and it is better but still a little on the soft side. So I guess I just need to keep adding a little oil at at a time unless some Goldwing guy in here knows the correct amount. 🙂

Bone - 4/24/2018 6:15 PM
Hi Jeff. yup I'm pretty sure it needs more oil but my forks have a schrader valve on the top and that makes changing oil really easy as I don't have to deal with trying to compress that horrendous spring to get the cap back on. "I are 98 lb weakling" hahaha 🙂

IIRC the shraeder valve is for air over oil, you put the right amount of oil & then change the air pressure to change the ride. If you aren't pumping up the air at all, your ride is going to be incorrect no matter HOW much oil you put in. Not that this helps much figuring out what that right amount would be, but you probably don't want to dial the ride in with only oil, you need to dial it in with air pressure, which should be pretty consistent no matter what size the fork is. That number should be pretty easy to find on Wing forums or manuals. When you have the right pressure, THEN mess with the amount of oil. 🙂

Jeff_Online - 4/25/2018 3:23 AM

Bone - 4/24/2018 6:15 PM
Hi Jeff. yup I'm pretty sure it needs more oil but my forks have a schrader valve on the top and that makes changing oil really easy as I don't have to deal with trying to compress that horrendous spring to get the cap back on. "I are 98 lb weakling" hahaha 🙂

IIRC the shraeder valve is for air over oil, you put the right amount of oil & then change the air pressure to change the ride. If you aren't pumping up the air at all, your ride is going to be incorrect no matter HOW much oil you put in. Not that this helps much figuring out what that right amount would be, but you probably don't want to dial the ride in with only oil, you need to dial it in with air pressure, which should be pretty consistent no matter what size the fork is. That number should be pretty easy to find on Wing forums or manuals. When you have the right pressure, THEN mess with the amount of oil. 🙂

Hi Jeff. Yup I sure do know about air over oil. However a number of years ago I had a 1993 Aspencade which has the very same suspension as my 1994 SE minus the schraeder valves. Everything was controlled by the oil level and it worked just fine. Like in most conventional forks. So all I really need to know is the proper oil level to start with and then worry about the air.
I have an old set of forks off my 93 Aspy. So I guess I could fill them to the proper level minus 2 inches and then measure the amount of oil in cc's to bring it up to the right level and put that into my 1994 SE. I think that should be about the proper level then.