Douglas Home
Zone Head
Posts: 710
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posted September 14, 2010 04:16 AM
Spring
Im now 5" over & weigh 95KG.
Would replacing the spring on its own be worth it,
and what spring are people using at my weight.
The bike is daily transport also.
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Doug Mackay Australia
  
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CraigChrist
Pro
BAWLS
Posts: 1043
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posted September 14, 2010 06:14 AM
You will hear people say both yes and no. My spring helped me tremendously, just because I was on an 07 model with the fuel pump that hangs way down and it made it so that I could launch with out bottoming out. A re-valve would be a lot better because the stock valveing just isn't enough to compensate, but if you don't have anyone to do it then ordering a spring would definitely be better than nothing. Especially if you could find a busa takeoff for cheap. Eklipse636 is about to have one for sale this week I believe, but I'm not sure what it would cost to ship it to you.
The spring that he has is a 13.8kg/in which is set up for a 185lb rider at 63".
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60ft-------1.42
1/8th------5.97
mph-------119
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Quarter Pounder
Pro
with Cheese
Posts: 1069
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posted September 14, 2010 08:01 AM
yep, new spring and a revalve as the stronger spring blows through the stock valving. Extended you are asking way too much of the stock shock.
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SWB 2008 ZX-14
9.19 @ 151
5.98 @ 123
1.53 60'
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Shane661
Needs a life
Posts: 11494
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posted September 14, 2010 08:08 AM
 Edited By: Shane661 on 14 Sep 2010 16:21
The 08+ fuel pump is a direct swap and I just picked up a spare for $66 shipped, off ebay. If adding a spring or not, a good investment. 
At your weight and wheelbase, I had no problems riding solo with the stock rear spring....street, LSR, and dragstrip.
It seems that a lot of people have swapped in stiffer springs, but later go to a re-valved shock. Some of the springs people are using are 800-1000 lb/in....whereas a typical high-end shock is 650-750 lb/in, with an increased damping range. For example, my Penske drag shock is only 650 lb/in. spring rate and has worked fine for me at up to 67.5" of wheelbase.
Obviously, high spring rates and stock damping will lead to an oversprung/underdamped condition. This may or may not be acceptable for your application.
Shane
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