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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Spring rate help YZ250
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[QUOTE="jim7411, post: 913328, member: 48850"] Again, I am no suspension guru but if you have a heavier spring you have to crank less preload into it to get your race sag correct. Since you have to put less initial tension on the spring, it is easier for it to sag under the bikes own weight (free sag). In the manual they are talking about the stock spring and standard preload 90-100mm so they give you the length of the spring to achieve those settings using that 4.9 stock spring. But that part I am not positive about. I am just somewhat guessing. That would be a good question from someone who really knows. It get's harder and harder to comress the spring the more you push down on it. So if you have to crank in alot of preload to get to your race sag for your weight then the spring is compressed so much that it pushes the bike up and holds it there. Therefore you end up with no free sag or very little. The more preload you have the less free sag you have. I hope this helps and I hope that I have not made any false statements here. Maybe somebody that really knows could chime in and help out. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Spring rate help YZ250
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