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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: 1326346" data-attributes="member: 18388"><p>OK, I'm getting it now. Actually, your sag is 152 - 97 = 55mm. Makes sense if your spacer is too short, which it is, since you cut off 50mm. Back off the 2.5 lines of preload, you are 67.5 mm of sag (roughly, it's not necessarily linear due to stiction, etc.).. Your 117 number is off too since the bike is falling down to take up the gap in your spacer to nut, and because you have zero preload in your calculations.</p><p></p><p>If you re-do your spacer calculations per the instructions, you'll find you should be much longer. As I mentioned, with RaceTech springs I usually cut off 32-33 mm not 50, but that depends on the length of the springs. But just guessing to get that 55 down to 40 you have to add 15+mm to your spacers. If it were me, I'd add 20mm (if you measured while set at 2.5 lines). You'll have enough adjustment, and even if you don't you can add a washer or two. As I mentioned earlier, if you want to simulate before you re-do your spacers, stack in 20mm worth of washers and recheck your sag.</p></blockquote><p></p>
[QUOTE="RaYzerman19, post: 1326346, member: 18388"] OK, I'm getting it now. Actually, your sag is 152 - 97 = 55mm. Makes sense if your spacer is too short, which it is, since you cut off 50mm. Back off the 2.5 lines of preload, you are 67.5 mm of sag (roughly, it's not necessarily linear due to stiction, etc.).. Your 117 number is off too since the bike is falling down to take up the gap in your spacer to nut, and because you have zero preload in your calculations. If you re-do your spacer calculations per the instructions, you'll find you should be much longer. As I mentioned, with RaceTech springs I usually cut off 32-33 mm not 50, but that depends on the length of the springs. But just guessing to get that 55 down to 40 you have to add 15+mm to your spacers. If it were me, I'd add 20mm (if you measured while set at 2.5 lines). You'll have enough adjustment, and even if you don't you can add a washer or two. As I mentioned earlier, if you want to simulate before you re-do your spacers, stack in 20mm worth of washers and recheck your sag. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Setting sag and preload on new fork springs?
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