mrsantafe
Zone Head
Posts: 521
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posted September 01, 2003 04:18 PM
16-44 4th gear@11k help
Im going thru the traps in 4th gear between 10.8-11k indicated on stock tac. The bike bounces off the rev limiter at an indicated 12.5. What gearing should I get to finish in 4th at 12.3-12.5K? 16-45, 16-46, 17-48? any ideas would greatly be appreciated!!
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9.78@155.13 mph 1.71 60 ft @ a near mile high dragstrip
2006 ZX14 gone
2006 ZX10r (Wifes street bike)
2004 zx10r (her race bike)
2002 ZX12 (still kicking a--)
2007 gsxr 1k (race bike)
  
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BA
Pro
Posts: 1592
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posted September 03, 2003 02:06 PM
well, I can't let ya hang like this Santa.......... 24 views, no replies.
Sounds like you need 'about' 10% more RPM. I'd suggest an equivalent of +3 in the back as a starting point. I honestly don't think +2 is enough, but admittedly, I'm only using my testing as a basis.
Keeping in mind the chain length vs wheelbase, I'll let you do the final math. That +3 in the back is close to -1T up front. (actually closer to 2.6T)
so either a 15T up front, which will NOT hurt your chain, or add in the back and increase the chain length.
all of this is in lieu of us changing your riding style 
you could change tires too. what size and brand are you using? My 190 tire added a couple of hundred rpm to my runs.
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wannabe
Pro
Posts: 1931
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posted September 03, 2003 03:29 PM
15T up front won't hurt your chain? Yeah, I'm starting to think that too. A lot of guys with the old KZ's at the dragstrip are running 14T up front.
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BA
Pro
Posts: 1592
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posted September 03, 2003 06:19 PM
some 9R's came from the factory with a 530 chain, and they use a 14T.......  (not that chain width should have anything to do with it...)
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted September 04, 2003 04:06 AM
Not 100% sure but I'm thinking he's asking about a ZX12R not a KZ? Although a 15 tooth may not "hurt" the chain in my experience it most definitely will increase wear as well as dig into the underside of the swingarm on a ZX12R.
Also note that personal experience running a 16-tooth front for extended periods of time has worn completely thru the plastic chain guides and left impressions in the aluminum on the swingarm itself on the underside, something not normally visible unless you remove the swingarm. The chain diging into the swingarm can't be a good thing for either!
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TurboBlew
Moderator
BUSY DOING THE SCHIAVO
Posts: 4590
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posted September 04, 2003 04:18 AM
A smaller sprocket up front has a tendancy to "jump" the countershaft on more powerful bikes. 16 is the smallest I would go on the countershaft.
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BA
Pro
Posts: 1592
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posted September 04, 2003 10:11 AM
good points Berg and TB............ I had forgotten about the possibility of the chain touching the swingarm, but I'd guess that the size of the rear sprocket also has a little to do with that.....
I think Wannabe mentioning the KZ was just like me mentioning the 9R, ...as a general rule a 14 and 15T is ok for the chain,........BUT, you're right, you've got to check your clearance!!! Good call.
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mrsantafe
Zone Head
Posts: 521
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posted September 04, 2003 02:40 PM
thanks fellas for the advise!! I'm going to try 16-46 this weekend at the drags. I'll follow up shortly.
____________
9.78@155.13 mph 1.71 60 ft @ a near mile high dragstrip
2006 ZX14 gone
2006 ZX10r (Wifes street bike)
2004 zx10r (her race bike)
2002 ZX12 (still kicking a--)
2007 gsxr 1k (race bike)
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PATRICK12R
Parking Attendant
Posts: 18
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posted September 09, 2003 11:02 AM
 Edited By: PATRICK12R on 9 Sep 2003 12:02
any results on the 16-46? i think we are in same boat. i tried 17-48 last weekend. just a little too low. made some mean three gear power wheelies. hit limiter just before trapps
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red 12's rule
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mrsantafe
Zone Head
Posts: 521
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posted September 10, 2003 09:44 AM
Hey patrick12r I'm going to the drags this weekend with 16-46 combo I hope it works out well. It sure works well on the street at mile high.
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9.78@155.13 mph 1.71 60 ft @ a near mile high dragstrip
2006 ZX14 gone
2006 ZX10r (Wifes street bike)
2004 zx10r (her race bike)
2002 ZX12 (still kicking a--)
2007 gsxr 1k (race bike)
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