Air shock oil change
Seasoned HDF Member
Joined: Apr 2008
Posts: 8,051
Likes: 50
From: Florence, MT (Bitterroot Valley)
Here's a couple of links to help:
https://www.hdforums.com/forum/showt...ght=rear+shock
https://www.hdforums.com/forum/touring-models/129136-making-the-stock-shocks-better.html
When I did mine, I just drained them out and put the exact amount back in. Don't know the number of cc's, but yes, it is a PITA... Much better ride now though.
https://www.hdforums.com/forum/showt...ght=rear+shock
https://www.hdforums.com/forum/touring-models/129136-making-the-stock-shocks-better.html
When I did mine, I just drained them out and put the exact amount back in. Don't know the number of cc's, but yes, it is a PITA... Much better ride now though.
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Tourer
Joined: Feb 2008
Posts: 420
Likes: 0
From: Twin Cities
I came across that long thread by TBH and lot's of info in there. Not much on how much oil though. There was one post that says 11.5 ounces, but I would like a concrete answer. Then there were also some posts in that thread that warned of doing this to the shocks.
Road Warrior
Joined: May 2008
Posts: 1,287
Likes: 3
From: murfreesboro tn.
i emailed cliff piper at piper performance and he says the 12" needs 350 cc of fluid. i found silkolene pure synthetic oil at 10 wt. at my local metric store. i also found a 1/4 x1/8 hose barb to go into shock fitting and attach hose.
Road Warrior
Joined: Jan 2005
Posts: 1,416
Likes: 27
From: Northern Part of the Great Lone Star State
Just a thought here...
Blue
I sent you a PM
Its been established that the 13" gets 325cc-340cc
now with this said...
Why wouldn't the 12" get the same?
They use the same upper portion of the shock...
The shocks are the same with the exception that the 12" have 1" less travel then the 13" which seems to relate to the shaft that attaches to the swingarm would possibly be 1" shorter...
If this is indeed the case then the oil capacity would then be the same but if its not then the oil level would be less...
Blue
I sent you a PM
Its been established that the 13" gets 325cc-340cc
now with this said...
Why wouldn't the 12" get the same?
They use the same upper portion of the shock...
The shocks are the same with the exception that the 12" have 1" less travel then the 13" which seems to relate to the shaft that attaches to the swingarm would possibly be 1" shorter...
If this is indeed the case then the oil capacity would then be the same but if its not then the oil level would be less...
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Road Warrior
Joined: May 2008
Posts: 1,287
Likes: 3
From: murfreesboro tn.
sounds reasonable tbh. my thoughts were if the amount is the same then the air chamber would be much smaller resuting in a stiffer ride with just a small amout of air.... i suppose i could start with 325 and see how it goes
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heavymetalthunder
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May 11, 2012 08:03 PM
