And how much? Is there any way to tell how much oil to put in your forks if you are not sure the year and cannot consult the manual?

 

I like a firm feel so i use 20 weight and to firm it a little more put in an extra 1 oz. What i mean there is i used the maximum of 12.5 oz as the recommended amount was 11.5-12.5 oz. As for capacities found this on the forums I would say it's quite accurate. Also in hotter climates can get away with the next heavier weight...

https://www.hdforums.com/forum/oil-a...nd-models.html

 

Thanks for the link and the reply, bro. I appreciate it.

 

Anytime man....ride on......

 

Somebody here said he uses W30 lawnmower oil.. same thing, way cheaper

 

I don't believe that SAE 30 motor oil is the same as Fork oil. Fork oil is more of a hydraulic oil and will not break down as much as conventional oil.... However I'm sure you can still use it if you wish too......

 

I know this is an older post, but I came across is searching other info.
The reference to 30W lawn mower oil was for early FLs, and NOT for FX models.

 

But... look again ... he said FXWG ... Identical forks except a bit longer...Which has Nothing to do with volume, BTW.
I will never use more oil for any reason... more spring, put more preload or change springs... more Damping action, use a heavier [single weight] oil..

 

Johnjzjz said use the 30 weight lawnmower oil in the forks, says its a vast improvement. Ill be running that in my 66. Not sure if it would apply to my TWINKIE but I might try it.

 

I used the 30w lawn mower oil in my 76 FLH, and it is great, after reading recommendation by jhohnjz.
I'm getting ready to put the original fork tubes back on my 85 FXWG (I changed it years ago to 2" under tubes from Franks).
I think I will use 20wt fork oil on this one.