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FJR Motorcycle Forums
Technical & Mechanical Problems
Setting sag and preload on new fork springs?
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<blockquote data-quote="RaYzerman19" data-source="post: 1326293" data-attributes="member: 18388"><p>That is the correct way to install the top cap, however instead of play in the spacer, you should have your desired preload (you were going with 20 mm?). Although not usually stated as such, you have negative preload (a space that must be taken up before the springs offer any resistance. When you measure sag, it should be from your zip tie, with the forks fully extended. As I expected, removing oil did not affect sag.</p><p></p><p>Add some washers to add preload (the real fix is new spacers, or add back in the appropriate amount of your cutoffs from the spacers), and remeasure sag.</p></blockquote><p></p>
[QUOTE="RaYzerman19, post: 1326293, member: 18388"] That is the correct way to install the top cap, however instead of play in the spacer, you should have your desired preload (you were going with 20 mm?). Although not usually stated as such, you have negative preload (a space that must be taken up before the springs offer any resistance. When you measure sag, it should be from your zip tie, with the forks fully extended. As I expected, removing oil did not affect sag. Add some washers to add preload (the real fix is new spacers, or add back in the appropriate amount of your cutoffs from the spacers), and remeasure sag. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Setting sag and preload on new fork springs?
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