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FJR Motorcycle Forums
FJR Parts & Accessories Discussions
Replaced Gen II shock with a Gen III shock
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<blockquote data-quote="Fred W" data-source="post: 1362455" data-attributes="member: 3828"><p>The problem is that even if we knew what the 2016 spring rates were, the published spring rates for the 2013 - 2015 are jacked up.</p><p></p><p>In the FSM it claims that the two Soft spring rates are:</p><p></p><p>K1 = 00-42mm stroke 976.41 lb/in</p><p></p><p>K2 = 42-60mm stroke 1952.83 lb/in.</p><p></p><p>... and the Hard spring rate is:</p><p></p><p>K1 = 14.1-60mm stroke 976.41 lb/in</p><p></p><p>Which makes no sense. In all prior years the Soft K2 spring rate was that same as the Hard K1 spring rate with the shorter spring coil locked out.</p><p></p><p>I would <em>guess</em> that what they meant was that the longer spring is 976.41, and that the shorter spring is 1952.83 <strong><em>by itself</em></strong>, which would mean the effective spring rate together would produce:</p><p></p><p><strong>651 lb.f/in for the K1 stroke of 42mm</strong>. Then after the shorter coil gets bound the rate goes up to <strong>976 lb.f/in for the remainder</strong> of the stroke (K2).</p><p></p><p>2nd Gens had shock springs that had published <em>effective</em> spring rates of <strong>520 lb/in for the first 42mm and 708 lb/in for the remainder</strong>, and 708 for the full stroke in Hard.</p><p></p><p>'04 and '05 1st Gens had <strong>475 lb/in soft rate but only for 32mm then 672 lb/in for the remainder</strong>, and 672 for all of Hard, but also had a shorter swing arm than later Gens have.</p><p></p><p>And early 1st Gens ('03 and earlier) had <strong>409 lb/in and 582 lb/in.</strong> effective rates.</p><p></p><p>Does anyone have the published spring rates for the '16A?</p></blockquote><p></p>
[QUOTE="Fred W, post: 1362455, member: 3828"] The problem is that even if we knew what the 2016 spring rates were, the published spring rates for the 2013 - 2015 are jacked up. In the FSM it claims that the two Soft spring rates are: K1 = 00-42mm stroke 976.41 lb/in K2 = 42-60mm stroke 1952.83 lb/in. ... and the Hard spring rate is: K1 = 14.1-60mm stroke 976.41 lb/in Which makes no sense. In all prior years the Soft K2 spring rate was that same as the Hard K1 spring rate with the shorter spring coil locked out. I would [I]guess[/I] that what they meant was that the longer spring is 976.41, and that the shorter spring is 1952.83 [B][I]by itself[/I][/B], which would mean the effective spring rate together would produce: [B]651 lb.f/in for the K1 stroke of 42mm[/B]. Then after the shorter coil gets bound the rate goes up to [B]976 lb.f/in for the remainder[/B] of the stroke (K2). 2nd Gens had shock springs that had published [I]effective[/I] spring rates of [B]520 lb/in for the first 42mm and 708 lb/in for the remainder[/B], and 708 for the full stroke in Hard. '04 and '05 1st Gens had [B]475 lb/in soft rate but only for 32mm then 672 lb/in for the remainder[/B], and 672 for all of Hard, but also had a shorter swing arm than later Gens have. And early 1st Gens ('03 and earlier) had [B]409 lb/in and 582 lb/in.[/B] effective rates. Does anyone have the published spring rates for the '16A? [/QUOTE]
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Replaced Gen II shock with a Gen III shock
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