Fat Bob fork fluid level
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Stellar HDF Member
Joined: Oct 2010
Posts: 2,589
Likes: 98
From: Port Orange, Fl
Fat Bob fork fluid level
Replaced fork seal and changed fluid. 2009 fxdf
Upon replacing fluid, I had fork compressed with no spring nor spacer. I poured the amount into a pre-mix cup. I put in 26oz and compressed several times and checked. It was not even close to 5.5" from top...more like 6.5" from top of tube.
That sure seems to be a rather healthy amount difference.
What would be the correct level and amount?
Upon replacing fluid, I had fork compressed with no spring nor spacer. I poured the amount into a pre-mix cup. I put in 26oz and compressed several times and checked. It was not even close to 5.5" from top...more like 6.5" from top of tube.
That sure seems to be a rather healthy amount difference.
What would be the correct level and amount?
Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
When I put my Intiminators in, I did not premeasure but used a homemade tool to verify fork oil at 4.72" from top. My HDSM says 26.5 oz per fork, but all I remember for sure is that I had no problem doing the job buying 2 qts.
Road Warrior
Joined: Mar 2012
Posts: 1,514
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From: USA
When I did mine i did not measure beforehand. I think the best method is with the forks off the bike, springs and spacers removed. Compress the forks fully and fill until you get the correct measurement from the top of the fork tube. Pump the fork tube 3 times and compress and measure again to be sure.
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Stellar HDF Member
Joined: Oct 2010
Posts: 2,589
Likes: 98
From: Port Orange, Fl
That's what I did but I filled my container to 26oz....it was way short in the tube. Almost like the tube was not compressed all the way or ? It was flat down with spacer or spring.
Road Warrior
Joined: Mar 2012
Posts: 1,514
Likes: 88
From: USA
Don't worry about how many oz. Just fill it until you have the correct measurement from the top of the fork tube with it compressed.
how short is it?
how short is it?
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Stellar HDF Member
Joined: Oct 2010
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From: Port Orange, Fl
no idea, it's been back together for weeks. my theory was not to overfill and see how it felt. Feels fine, I guess. I was curious if others found this measurement Vs amount put in to be not so exact.
Last edited by shore; Sep 22, 2017 at 11:17 AM.
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Elite HDF Member
Joined: Sep 2012
Posts: 3,791
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From: N Texas
This sag is 27% of total shock travel which is within most recommendations of 25% to 33%.
Your #s should be similar.
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