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Old 11-25-2012, 01:15 PM   #1 (permalink)
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FXR vs FXRT fork oil level

Quick question relative to fork oil level. I'm rebuilding my '87 FXR 35mm forks and using 2" over tubes at 25 1/4". This matches the tube length and diameter on the same year FXRT. H-D manual says to use 7 oz of oil in the FXR and 7 3/4 oz in the FXRT, (this is volume when rebuilding, i.e. dry volume)

Should I use the 7 3/4 oz as specified for the FXRT since I am now installing the 25 1/4" tubes that match the stock FXRT length?

Thanks for any advice you guys can provide!
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Old 11-25-2012, 02:36 PM   #2 (permalink)
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First, where are you getting those specs.? My book is a service manual 1984-1987
FXR/FXRS is 6.0 oz and the FXRT is 7.2.. But your logic would make sense to me,
as far as using the FXRT spec in a pair of 2 over tubes.
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Old 11-25-2012, 05:04 PM   #3 (permalink)
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Yes, use the higher volume because your forks are longer and hold more oil. Go by fork length rather than model for oil specs. My service manual says 7 3/4 oz dry
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Old 11-26-2012, 09:44 AM   #4 (permalink)
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I thought the forks were 39mm on a 87 FXRT
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Old 11-26-2012, 10:09 AM   #5 (permalink)
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Thanks for the input...the '84-87 H-D manual does say 7 3/4oz dry for the '87 FXRT. Dry replacement volume is more than wet exchange volume. The FXR, FXRS (not FXRS sport edition) and FXRT in '87 all had 35mm forks. The FXLR and FXRS SE had 39mm in '87. All FXR models went to 39mm in '88.

Thanks again for the advice. I will go with a spec of 7 3/4 oz dry for my 25 1/4" tubes.
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1987 FXR (original owner)
Screamin' Eagle Heads
Wiseco forged flat tops
Ev 27 cam
Ness big sucker


2012 FLHX
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Old 11-26-2012, 03:19 PM   #6 (permalink)
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My '87 FXRT (by vin number, doesn't look like one) has 39 mm forks...I just re-built them this weekend. May the previous owner change them?
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