zog52
Parking Attendant
Posts: 2
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posted July 24, 2002 05:51 AM
Changing Front Sproket on ZX12 ????
Im Thinking of dropping a tooth on my front sproket on my 2002 ZX12. My friends say it will give me more bottom end power but I may lose top end. Has anyone tried this??? What results did they get???
  
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Otis
Needs a job
Captain Kickstand
Posts: 3028
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posted July 24, 2002 05:54 AM
You will have better acceleration but lose a few miles per hour on the top end. You should absolutely drop to a 17t on the front. I think almost every 12 owner has. And the friend who says you wil have more bottom end power is confused, you don't get more power from it, just quicker acceleration cause of the difference in ratio's.
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It's a free country brother
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hott-rodd
Novice Class
Posts: 96
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posted July 24, 2002 07:25 AM
17t is the ticket!
Otis, I think you two are trying to say the same thing.
Most people equate acceleration to power.
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Otis
Needs a job
Captain Kickstand
Posts: 3028
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posted July 24, 2002 07:32 AM
Yep, just pointing out that power doesn't change, obviously.
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It's a free country brother
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jason370
Zone Head
Posts: 589
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posted July 24, 2002 10:30 AM
anyone have a detailed install on the 17t? or is it just so easy to do that any idiot(me) can do it? wheres a good place to pick one up? should i change my chain with the new sprocket as well?
jason
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'02 ZX12 black/gold
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22348bCVC
Zone Head
Posts: 798
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posted July 24, 2002 10:35 AM
 Edited By: 22348bCVC on 24 Jul 2002 11:37
Don't frustrate yourself...get to a shop who'll let you use an impact wrench (if you don't have one yourself) to loosen the sprocket nut...ensure that the transmission is in NEUTRAL!!!...it's really simple once you've removed all the other obvious stuff...good luck!
...most here (I think) are using the rubber-damped 17T sprocket from the ZX-11D, but the aftermarket work well, too, altho a bit 'noisier'
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...just relax...my dog wants to use only one of your legs...
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jason370
Zone Head
Posts: 589
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posted July 24, 2002 10:37 AM
you know how these blood sucking shops are, they wont let me do my own work in the shop, and they will charge me 3 hours labor for 40 minutes of work. arggh
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'02 ZX12 black/gold
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22348bCVC
Zone Head
Posts: 798
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posted July 24, 2002 11:02 AM
go rent a mondo electric impact wrench...don't be limp-wristed about handling the torque of these babies, tho, or you'll injure yourself...seriously!
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...just relax...my dog wants to use only one of your legs...
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zog52
Parking Attendant
Posts: 2
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posted July 24, 2002 02:32 PM
thanx for the info guys
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jason370
Zone Head
Posts: 589
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posted July 24, 2002 03:36 PM
if anyone want to post a step by step on the install, i wouldnt mind one bit
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'02 ZX12 black/gold
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12RPilot
Pro
Posts: 1094
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posted July 24, 2002 05:51 PM
Be careful. If the sprocket nut is really on tight and you put the impact wrench on it, you will launch the bike right through the wall of the garage!!!!
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If you aren't an AMA member, you're part of the problem.
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Zhooligan
Moderator
Post Whore Extraordinaire!
Posts: 3829
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posted July 24, 2002 06:05 PM
Place bike on rear stand. Loosen rear axle and chain adjusters. Remove the front sprocket cover. Use a cold chisel or old screw driver to flatten out the saftey washer plate what ever it is called that is peened over to prevent the sprocket nut from coming loose.
Now comes the big moment, using an impact wrench and the appropriate socket (size slips my mind at the moment) pull the trigger and the nut is off. The nut turns the standard direction (righty tighty lefty Lucy!) Pull the sprocket of and out of the chain. Install your new sprocket. Put the chain on the sprocket prior to slipping the sprocket into place. Then tighten the nut with the impact, peen the retainer plate over as it was in the beginning, adjust your chain, install the cover and then go riding.
If you can't get an impact, as awful and socially unacceptable as it sounds. Put the bike in neutral (do so even with the impact) throw something like a t handle or 3/8 drive extension between the chain and rear sprocket to lock things up slam you biggest rachet or breaker bar on your socket and jump on it to remove the nut. It works and frankly go to the race track and you will see the factory mechanics do this.
It takes longer to type this than doing it.
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To those who do not count their life in years, but in how life
has touched them in the past and how much it can hold in the
future; -- Youth is forever.
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entropy
Moderator
Posts: 8671
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posted July 24, 2002 07:09 PM
Zhooligan:
"It takes longer to type this than doing it..."
The SECOND time you do it, yes!
Good explanation, excellent.
Another way to hold the rear wheel from moving when you "jump on the breaker bar" is to put a 2x4 thru the wheel over the swingarm (good to take off the chain guard).
In any event you need to secure the rear wheel if you want to torque the nut back on to spec, although some folks just hit it with the impact wrench.
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This moderator uses moderation in moderation
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wannabe
Pro
Posts: 1931
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posted July 24, 2002 09:16 PM
Zhooligan: "...lock things up slam you biggest rachet or breaker bar on your socket and jump on it to remove the nut"
Be careful doing this. You probably won't have a problem, but when I was changing the front sprocket on my old bike ('86 Ninja1000R) I ended up bending two breaker bars doing just what Zhooligan suggests. (The guy at Sears looked at me real funny when I came back the second time on the same day with another bent breaker bar.) I'm guessing that the idiot that owned the bike before me used an impact wrench to tighten the nut when he put it on.
Well, at least the whole experience gave me an excuse to add an air compressor and impact wrench to my tool collection. ;-)
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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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Zhooligan
Moderator
Post Whore Extraordinaire!
Posts: 3829
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posted July 24, 2002 09:29 PM
Nothing is a substitute for good tools. And these days you can buy a cheap electric impact to handle these items if necesary. And afterall that is what Sears' guarentee is suspoe to do!!
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To those who do not count their life in years, but in how life
has touched them in the past and how much it can hold in the
future; -- Youth is forever.
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wannabe
Pro
Posts: 1931
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posted July 24, 2002 09:44 PM
I heard this line from a Snap-On Tools guy while I was paying for an $80 wratcheting screw driver. It has turned into my mantra when making purchase decisions:
"Once you buy the best, you only cry once."
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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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Zhooligan
Moderator
Post Whore Extraordinaire!
Posts: 3829
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posted July 24, 2002 09:58 PM
Preaching to the choir!
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To those who do not count their life in years, but in how life
has touched them in the past and how much it can hold in the
future; -- Youth is forever.
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moodybluezx12r
Expert Class
Posts: 344
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posted July 28, 2002 01:31 AM
Guys....My buddy owns a 2000 zx-12r and ordered a 17 tooth sprocket, which he wants to sell to me (new in the box), only one problem though, it is for the 2000-2001 zx-12r. My question is will the 2000-2001 sprocket fit the 2002?
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Raleigh, NC
Ride it! Like You Stole It!
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swft
Needs a life
Full throttle!
Posts: One MEEEEEELLION
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posted July 28, 2002 05:11 AM
pretty sure it will. Check www.buykawasaki.com and compare the part numbers of the 18t sprocket for the 00/01 and the 02 bike, I bet they are the same 18t, which means the same 17t will work.
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beansbaxter
Needs a life
Posts: 5911
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posted July 28, 2002 03:20 PM
Edited By: beansbaxter on 28 Jul 2002 16:21
What are some good manufacturers for sprockets that are reliable and good?
How are JT Racing? Moose? Renthal? Sunstar?
All opinions welcome here...or what brand of sprocket is everyone getting since everyone says every 12 owner get a 17t done.
Also, how much top end do you really lose?
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zx12richard
Pro
The Green Monster..
Posts: 1133
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posted July 28, 2002 03:53 PM
Alot of guys run the ZX11D sprocket as it has the rubber dampners like the stock 18 tooth..
The part number is 13144-1224 and Ron ayers will probably be the cheapest.... Hope I could help....
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