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Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders Discuss Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders problems, advice, and/or how tos.

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  #1  
Old 21st March 2012
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Default Forks are sticking. HELP?

I disassembled my forks to get my lower legs powder coated reassembled them and now my forks are sticking most of the time. I put 12oz in my forks that have stock springs. I don't know if I should have added more because i took them completely apart or what. I didn't measure how far the oil was from the top of the tube.



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  #2  
Old 21st March 2012
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Can you explain more about "sticking"? Are they sticking fully extended or fully compressed, or are they just slow responding? Do they make any "grinding" noisees or "squish" noises when you are moving them, this will tell you if they are assembled wrong of if it is a damping issue. This will make it a bit easier to diagnose. Do you have a service manual to verify your re-assembly? Also, what type and weight oil did you use?

12 ounces of oil seems like a bit much. I think the service manual calls for 9 ounces "wet" (just changing the oil without disassembling), or 10 ounces if they are completely taken apart like in your case.
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Old 21st March 2012
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They are sticking compressed. When i push them down they don't come back, nor when i ride. When i am riding they are compressed about an 1.5" more than when fulling uncompressed. Enough to notice that they aren't functioning properly. They sound normal no unusual noses. I have a Clymer manual and purchased my oil from the dreaded harley shop. I assembled them per print to my manual.
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Old 22nd March 2012
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Read the "7 Pages of Suspension" in the Suspension Sticky Section. Either you have too much oil in them, or they are twisted or pinching each other. You have to measure the oil level with the forks compressed, springs removed, and held vertical. There is also a proper torque sequence for tightening the forks and axle.

You could also have put in the wrong oil viscosity, way too thick may not allow them to rebound.
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