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FJR Motorcycle Forums
Technical & Mechanical Problems
It's NOT preload!
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<blockquote data-quote="yamafitter" data-source="post: 1265468" data-attributes="member: 15141"><p>You need to understand what is happening when you turn the 17mm adjuster. Next time you have your forks apart turn the adjuster and look what is happening. The fork cap has an inner and outer section. The outer section threads into the fork tube and therefore relative to the fork tube does not move. The inner section is threaded into the outer section of the fork cap and therefore moves up and down relative to the fork tube.</p><p></p><p>When you turn the "preload" adjuster in (less lines showing) the distance between the top of the cartridge and the bottom of the fork cap is decreased. The only way this can happen since the preload spacer position is fixed relative to the cap is for the spring to compress. This by definition is increasing preload.</p><p></p><p>All other things being equal when preload is increased the spring pushes back against the top spring washer and since everything is fixed above the washer the fork tube will extend slightly which reduces sag.</p><p></p><p>Sorry for the long winded explanation but I wanted to be as clear as possible.</p></blockquote><p></p>
[QUOTE="yamafitter, post: 1265468, member: 15141"] You need to understand what is happening when you turn the 17mm adjuster. Next time you have your forks apart turn the adjuster and look what is happening. The fork cap has an inner and outer section. The outer section threads into the fork tube and therefore relative to the fork tube does not move. The inner section is threaded into the outer section of the fork cap and therefore moves up and down relative to the fork tube. When you turn the "preload" adjuster in (less lines showing) the distance between the top of the cartridge and the bottom of the fork cap is decreased. The only way this can happen since the preload spacer position is fixed relative to the cap is for the spring to compress. This by definition is increasing preload. All other things being equal when preload is increased the spring pushes back against the top spring washer and since everything is fixed above the washer the fork tube will extend slightly which reduces sag. Sorry for the long winded explanation but I wanted to be as clear as possible. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
It's NOT preload!
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