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Re: Changing Fork oi on 91 FLH
Each fork takes 11.5 ounces of folk oil, and for a 91, use heavy duty fork oil, they fill from the fork tube caps, remove them from the top of each fork, support the bike so the front wheel is off the ground, tighten the Caps to 40 -60 lbs when yer done
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OK officially you are supposed to measure oil height. Oil quantity is not quite right because you cannot measure the amount of oil remaining in the passages or on the walls. its only a little but to be correct set it at 110mm from the top, compressed, no spring.
if you don't have the tool and don't wanna try to do it properly, 300cc per fork.
Well, when you take off the fork make sure you empty it first before anything else then make sure that the fork pressure spring is released before changing the seals. The fork oil amount should be no more than 200 cc or no less than 190 cc
lower for legs there should be a drain bolt for each leg do one side at a time. Take the top fork cap off be careful the top cap is spring loaded get a pan to catch the oil,remove the drain bolt let it drain.reolace the drain bolt then you can add your new fork oil,check your owners manual for the proper amount and weight oil you need to replace, replace the fork cap. repeat steps on the other fork.
The best way to fill fork oil is to add the specified amount and let the forks sit overnight to allow all entrained air escape. Leave the fill plugs off. Ofter you let the air escape, plug it up install the forks and add air to the desired pressure if has that option.
This is an old thread but just in case you haven't gotten the problem fixed, you need to change the fork oil in your forks. The main reason is to make sure you've got the correct amount in them.
If after changing the oil they're still too spongy, you need to change the oil to a heavier weight oil. Use 30 weight "FORK OIL". Do not use any other type of oil as it may foam. Use fork oil only and in the correct amount. Your owner's manual should tell you how much oil to add.
To drain the oil, there is a plug down near the axle on each fork slider. At the top triple trees, there is a large cap on each fork tube. Take this out and add the proper amount of the proper weight oil. Only do one tube at a time. You may have to get the weight of the bike off the front end.