kawasakijockey
Pro
Posts: 1876
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posted June 02, 2009 08:07 AM
Looking at the shock you will see where it runs out of threads.
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Get on the shortbus boys 'cause its time to get schooled.
2007 ZX-14
1.38 60ft
9.03 @ 149mph
8.95 @153 small shot n2o
8.68 @160mph 5lbs boost
  
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Big_T112
Pro
Posts: 1061
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posted June 02, 2009 09:27 AM
I ran mine all the way down to the end of the threads. then when that was not enough I found some extra springs I had from a progressive shock. don't know what the rating is but it is black and the spring coils are a lot bigger than the stock shock. There is a guy on Ebay that will spring your shock and revalve it for $199. You send him your shock + your weight and how long the bike is and he sends you a shock back. I have not used him yet but it sounds pretty good. We have been putting the Busa shocks on the 1000's for quite some time and they work good.
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FIREBRAND74
Novice Class
Posts: 63
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posted June 02, 2009 09:49 AM
This is good info. I went to the track the other nite and i have the tiger tail. i have a revalved shock but it still scrubbed. I'm going to tighten my spring and see whats the outcome. Thought about modifying the tiger tail. Killing my 60 FT . My best even with the scrub was 1.43 hope to get better!!!
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zx14dreamin
Expert Class
Posts: 101
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posted June 02, 2009 11:26 AM
Is there a walk through anywhere on that shows on the zx14 specifically how to do this, the pics in the manual for the rear don't really help
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Big_T112
Pro
Posts: 1061
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posted June 02, 2009 12:20 PM
There are two collar rings at the topof the spring that can be turned with a spanner wrench. one of them is used like a jamb nut. back to top one off out of the way and use a spanner wrench to turn the second one down (clockwise). I had a good spanner from a dirtbike tool set that I used. once you get towards the end it will be tight. Look between the coils of the spring and you can see where the threads end. Run it as far down as it will go. They are fine threads so it will take a while to run it down.
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kenneth charles
Parking Attendant
Posts: 27
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posted June 02, 2009 03:04 PM
BUY THE SPRING ! the zx spring has a rating of .9kg/mm.racetech recommended an 1.17kg/mm for me at 240lbs.,stock length.1.143 kg/mm for 240lbs. 6" over.i ordered a spring,and forgot to mention the wheelbase.so i have an 1.17kg/mm spring that i can send back.then i ordered the correct one,and while waiting on it(had to be special ordered from eibach),i bought a complete busa('08) shock.got impatient,installed the busa spring on the zx shock.well,i rode the bike sunday,busa spring on zx shock,lowered as low as the adjustable links(soupy's)recommend,with a 150lb. pass(i weigh 240).no rubbing,but still a little soft.in the meantime,my special ordered spring arrived.it is heavier than the busa spring.so now i'm going to install it,and that should fix me right up.the busa spring is good for me by myself,and would work great for someone lighter than me with a passenger.
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bigwil
Expert Class
06 zx 14 turbo stage 3
Posts: 423
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posted June 02, 2009 04:30 PM
whats the diffrence from a 07 to o8 shock cuz i got a 07 spring
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bigwil// going fast aint easy so turbo it
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Zuluninja
Parking Attendant
Posts: 12
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posted June 03, 2009 03:37 AM
kenneth, not to bust your chops but u have to roll down that decimal point... it's 9.7 kg/mm for the zx14, 13.1 kg/mm for the busa. They don't have a rate for the 08 busa spring but they do for the other years as I guess suzuki didn't change that spring or anything else on that bike till the ZX14 came along, lol. I messed around with racetech's calculator yesterday and it seems the stiffest spring on a ninja came with the ZX12, rated at 11.0 kg/mm, might be an option if u want to keep it in the kawi family.
As for now, I got a spanner wrench/socket (?) at cycle gear (u plug it on a ratchet) and brought the nut down to about 1.5 cm above bottom thread, kinda tricky with that wrench as it wiggles on the ratchet but a long flat screwdriver helped me keep it in place. Also made a tag bracket that pushed the tag out all the way to the rear right under the stop light; with rebound and compression set at 1/2 turn out from full stiff, I'll take my girl for a ride today and see how it goes. Anyway I'll go ahead and get me a busa spring and soupy links later.
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SteddyTeddy
Pro
Posts: 1664
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posted June 03, 2009 04:20 AM
The ZX6R spring is the next size stiffer from the stock 14 spring. I have 2 laying here is anyone wants one.
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Zuluninja
Parking Attendant
Posts: 12
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posted June 03, 2009 06:53 AM
I was told the same thing at cycle gear; I checked racetech's calculator and the zx6r came up to the same rating, 9.7 kg/mm from 03 till 06, then it went down to 9.2 kg/mm.
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zx14dreamin
Expert Class
Posts: 101
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posted June 03, 2009 01:41 PM
quote:
There are two collar rings at the topof the spring that can be turned with a spanner wrench. one of them is used like a jamb nut. back to top one off out of the way and use a spanner wrench to turn the second one down (clockwise). I had a good spanner from a dirtbike tool set that I used. once you get towards the end it will be tight. Look between the coils of the spring and you can see where the threads end. Run it as far down as it will go. They are fine threads so it will take a while to run it down.
Thanks! so is this done with the tire on ? I just can't imagine my hand getting into that little space where the rear spring is at. There is a spanner in the tool kit for the bike I believe.
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kenneth charles
Parking Attendant
Posts: 27
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posted June 03, 2009 06:04 PM
zuluninja,you're right.9.7 vs. 13.1.they recommended 11.7 for 240lbs.14.25 for 240lbs.-6"over.
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Zuluninja
Parking Attendant
Posts: 12
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posted June 04, 2009 07:28 AM
my tool kit didn't bring a spanner, I had to buy one that has a hole in it to plug to a ratchet, it kinda sucks as it's not a tight fit to hook on the nut's teeth but it got the job done. I turned it all the way down, she does feel stiffer but she also gained some height, I would say she's around 1 inch taller at the seat.
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Big_T112
Pro
Posts: 1061
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posted June 04, 2009 01:36 PM
I have done it both ways. This Time I just took the shock out and did it. You can get in there it's just tough.
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Zuluninja
Parking Attendant
Posts: 12
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posted June 05, 2009 09:44 AM
is the hayabusa spring longer than the zx-14?
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gilberjj
Needs a job
Friend of Fast
Posts: 3196
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posted March 21, 2011 07:20 AM
I'm having my shock resprung by Trac Dynamics, and they informed me that a gen II hayabusa spring is too long for the zx14. The recommended a gen I spring. Any thoughts?
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serius blk
Zone Head
Posts: 543
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posted March 21, 2011 10:09 AM
i have the heaviest race tech coil going by there weight chart. The bike wouldnt squat at all with it. I put the stock coil back on. I have had the shock revalved thru bmc and have the shock spacer from muzzy. My bike is 68in and the suspension works better so far with the stock coil. I did have to raise it up in the back because it was bottoming out. Im 250 and have done 1.44 so far. I think it can still be adjusted more. the heaviest coil doesnt give at all. even with me and someone else on the bike.
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Big_T112
Pro
Posts: 1061
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posted March 21, 2011 01:38 PM
I used a 99-07 Busa spring on mine. It was at least a 1 1/2" to 2" inches taller then the ZX14 spring I took off. It is not as stiff as the 08 spring. I am 235lbs and have the retainer run down about half way, works really good. 99-07 Busa shocks are a dime a dozen and cheap.
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68gts2
Zone Head
hobbies ( Beating you !!! )
Posts: 927
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posted March 22, 2011 06:57 AM
 Edited By: 68gts2 on 22 Mar 2011 15:12
I'm swb and weigh 230lbs in full gear. I tightened the nuts all the way down,and it helped some.I called Traxxion Dynamics and the guy told me these bikes are undersprund for even a 150lb rider. Dusty you had your shock revalved by BMC who just revalves and doesn't like to swap springs didn't you? Every other shock company disagrees with him. I decided to steer clear for that reason. As soon as I get back from the Dragon monday I think I'm going to send mine to Traxxion for a re-valve and spring upgrade.
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Chromed-out,in the dirt 08SE with all the good stuff!!!
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gilberjj
Needs a job
Friend of Fast
Posts: 3196
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posted April 05, 2011 12:57 PM
I just sent my shock into Trac Dynamics for a revalve and a stiffer spring. The tech kinda convinced me to go with the gen I spring. He was more knowledgeable then me, so I took his advice. He said the valveing can be set to very stiff compression and rebound, and for a drag bike, you want the valving to do the resistance, not the spring. Plus the Gen II spring is another 2 inches longer then the gen I spring. Very reasonable pricing. I will be selling my stock shock off my bike as soon as next week if anyone is interested.
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