j_meaghe
Parking Attendant
Posts: 5
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posted October 21, 2002 07:09 PM
Rear spring preload???
About how much sag do you like to see in the rear end on a 12 with stk arm?? and what settings on the shock?
  
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TurboBlew
Moderator
BUSY DOING THE SCHIAVO
Posts: 4590
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posted October 22, 2002 02:34 AM
I think the rule of thumb is 1" with you sitting on the bike. Your requirements may be different if you lower the bike. You dont want the suspension to be too hard because it could sacrafice some traction. The ZX12 shock comes with about 15mm of preload on the spring. YOu may need to take some preload out or add some depending on your weight.
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HCcandy
Expert Class
Posts: 145
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posted October 22, 2002 07:06 AM
Hello
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j_meaghe
Parking Attendant
Posts: 5
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posted October 22, 2002 09:18 PM
Hey you
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HCcandy
Expert Class
Posts: 145
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posted October 23, 2002 09:57 AM
Call me...
 Lets ride the bikes to the track tonight, hopefully
it will not rain so we can race...
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j_meaghe
Parking Attendant
Posts: 5
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posted October 28, 2002 07:52 PM
I guess what I was trying to ask is on the 12r (stk arm) for drag racing only would you rather have alot of preload in the spring of the least posible? I have seen it both ways and was trying to get some imput on differnt set ups. O HI MCK
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wannabe
Pro
Posts: 1931
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posted October 28, 2002 08:09 PM
Here's a reprint from a guy named Frank Adams who posted the following on a Haybusa site back in April 2001. It totally helped me understand suspension settings relative to drag racing:
For the rear susp/shock:
Too soft= wheelie
Too stiff= wheel spin
If it's too soft, the weight will transfer to fast and cause it to wheelie. The momentum of the weight going to the rear tire has to be slowed down in this case.
If it's too stiff, it will not allow enough weight to handle your hp and end up in wheel spin.
The top of your shock has a rebound dampener. That setting should always be set to the stiffest. This will some what help keep the bike planted and not unload the tire in between shifts. Big hp streetbikes will probably need the help of an aftermarket shock to help with that cause.
The bottom of the shock has a compression dampener. This setting will get the most attenion. The stiffer the setting, the harder it will be to compress the shock.
If your not spinning the tire,but your frontend is coming up, you'll need to go with a stiffer setting.
Wheel spin-softer setting.
*Note- if you get to the point that your on the softest setting, and you got your air pressure in the rear tire down close 12pds,...you may have to loosen the shock collar a few threads to gain an even softer suspenion.
Or just the opposite for wheelie problems.
Front forks, two dampeners...top & bottom.
Bottom dampener: compression- adjust this to determine how fast the frontend dives when braking. Wont need to use this dampener for dragracing.
Top dampener: rebound- use this dampener to slow down the rate of speed that the forks want to extend. I usually set this dampener at it's stiffest setting on all Busas.
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"There are only three sports: bullfighting, motor racing, and mountaineering; the rest are just games." - Ernest Hemingway
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