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FJR Motorcycle Forums
FJR Parts & Accessories Discussions
Gen III Non-ES fork upgrade?
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<blockquote data-quote="Fred W" data-source="post: 1271235" data-attributes="member: 3828"><p>From what I see, the 3rd Gen (non-ES) fork springs are dual rate springs, very similar to the old 1st Gen springs. The first 67.5mm are a softer .85 kg/mm and the second half of the spring is a stiffer 1.02 kg/mm. Normal loaded sag is ~45mm or so, and the spring installed pre-load is probably 5-10mm, so that means that when you ride down a smooth road you are still on the softer .83kg/mm spring until you hit anything that compresses the fork more than 10mm, then you would be into the stiffer 1.02 kg/mm spring.</p><p></p><p>For comparison and historical purposes:</p><p></p><p>1st Gens thru 2003 had dual rate springs</p><p></p><p>K1 = 91mm @ .799 mm/kg, and K2 = 91 - 135mm @ .999 kg/mm</p><p></p><p>2004 and 2005 1st Gens also had dual rates</p><p></p><p>Same K1 as in '03 but K2 was stiffened to 1.10 kg/mm</p><p></p><p>All 2nd Gens have single rate .85 kg/mm springs.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1271235, member: 3828"] From what I see, the 3rd Gen (non-ES) fork springs are dual rate springs, very similar to the old 1st Gen springs. The first 67.5mm are a softer .85 kg/mm and the second half of the spring is a stiffer 1.02 kg/mm. Normal loaded sag is ~45mm or so, and the spring installed pre-load is probably 5-10mm, so that means that when you ride down a smooth road you are still on the softer .83kg/mm spring until you hit anything that compresses the fork more than 10mm, then you would be into the stiffer 1.02 kg/mm spring. For comparison and historical purposes: 1st Gens thru 2003 had dual rate springs K1 = 91mm @ .799 mm/kg, and K2 = 91 - 135mm @ .999 kg/mm 2004 and 2005 1st Gens also had dual rates Same K1 as in '03 but K2 was stiffened to 1.10 kg/mm All 2nd Gens have single rate .85 kg/mm springs. [/QUOTE]
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FJR Motorcycle Forums
FJR Parts & Accessories Discussions
Gen III Non-ES fork upgrade?
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