claude
Expert Class
Posts: 205
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posted June 04, 2003 04:41 PM
Front sprocket question
Just curious: is it possible to get a 19T (yes, nineteen) front sprocket for a ZX-12R? Any sources? Thanks!
  
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RAC4IT
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Bergie
Posts: 3009
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posted June 04, 2003 04:57 PM
I'm interested in one too. I remember YCIS talking about a manufacturer having a small production run of them this year but I don't know if that ever actually happened or not.
As an alternative you could search for a 19T sprocket for the ZX-11 application, it should work on the 12 since the 17-tooth ZX11 front sprocket is compatible.
If you find them, please let me know, I would like to get one for land speed racing.
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claude
Expert Class
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posted June 04, 2003 05:27 PM
Just before posting, I checked at sprocketspecialist and all what they offer for ZX-11D are 16, 17 and 18.
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swft
Needs a life
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posted June 04, 2003 06:21 PM
You might run into a clearance issue there...Why not just drop the rear down to a 43 tooth?
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ZHooligan
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posted June 04, 2003 08:13 PM
 Edited By: ZHooligan on 5 Jun 2003 08:48
If you really want one you can call sprocket spealties and they will make one. Usually pretty reasonable. maybe $10 over cost if they don't already make one.
For Daytona we set the RC51 gear box as a real close ratio. In return we had to gear it really tall via a big countershaft sprocket. Don't recall the exact size, but what we did was have the local machine shop throw it on their lathe and trimmed the tips of the teeth off so the sprocket cleared the case without any problem. Worked quite well.
One thing about it if it will fit a 19 will certainly keep the chain off of the swing arm!!
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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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your car is slow
Needs a job
Fuck Nitrous...Got Boost?
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posted June 05, 2003 06:14 AM
eh...I called vortex and SS....I dont recall which one said which...but it was made clear that if you wanted a custom sprocket done...you had to order 20 of them (or some number like that) and it would take them 6months to produce.
Although I do recall one of those two saying they would produce a 19t for the busa & 12R in the coming months. Guess that never happened.
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dougmeyer
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posted June 05, 2003 06:42 AM
Won't fit.
Doug
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your car is slow
Needs a job
Fuck Nitrous...Got Boost?
Posts: 4089
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posted June 05, 2003 07:02 AM
would it fit without the cover?
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Do not taunt happy fun ball!
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swft
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posted June 05, 2003 11:57 AM
Would it fit in a jam?
Could I put it in with spam?
Could I fit it on some toast?
Or is 18 teeth the most?
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VincentHill
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posted June 05, 2003 12:59 PM
Jim in Michigan was also looking for enought people to have some 19's made. It was either 10 or 20 orders. He said that on the ZX12, you had to remove the metal brace in the side cover and then it would fit.
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Made History @ Daytona and still one fast old man!!
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dougmeyer
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moderated
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posted June 05, 2003 02:52 PM
I looked at it and decided it was not a good idea- Too close to the expensive bits. ANYWAY, WHY? If you figure out the ratios there is nothing useful you can't achieve with a 17, 18 and a couple rears. In all my time at Bonneville I've never needed anything bigger than an 18. Maybe with a big boost turbo but I don't think so. You can go al the way down to a 38, after all.
Doug
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ZHooligan
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posted June 05, 2003 05:11 PM
What did you run for your bonneville set-up Doug?
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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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RAC4IT
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Bergie
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posted June 05, 2003 05:36 PM
Good point
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ZHooligan
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posted June 05, 2003 08:18 PM
Good chart that shows gear ratios for various sprocket combinations.
http://hondaex.com/techtips/gearing.htm
____________
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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dougmeyer
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moderated
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posted June 06, 2003 07:17 AM
I usually fish around in the 17/39 18/40 area depending on the time of day.
Doug
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ninja12
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posted June 06, 2003 07:50 AM
Edited By: ninja12 on 6 Jun 2003 08:52
That chart is nice. Thanks
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VincentHill
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posted June 06, 2003 08:35 AM
I know it is close to the cases. From talking to Jim, I think he was looking at two things. Keeping the chain off of the long swingarm and the small power loss of bending the chain around tighter and tighter Circles. (16 vs 17 vs 18 vs 19).
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dougmeyer
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posted June 06, 2003 01:25 PM
The time would be better spent riding than thinking.
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VincentHill
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posted June 06, 2003 02:41 PM
Dr. Doug, none of us can ride 24 / 7, but we all can think 24 / 7  WHen we are not racing / riding, we are thinking! My best thinking come in a little room called the Library. SOme of the thoughts would be better off if they could be flushed
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dougmeyer
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posted June 06, 2003 02:49 PM
My thought was learning to ride faster, rather than thinking about a fraction of power loss due to one tooth less on the C/S.
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VincentHill
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posted June 06, 2003 07:33 PM
I knew what you meant. A certain Road racer has a bike that 100 People have better bikes, but that does not stop him! Rather than worry about HP, Iam now getting my Body out of the way which will have the effect of 10 to 20 more HP!
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frEEk
Administrator
ummm... yeah
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posted June 06, 2003 10:54 PM
what's this "thinking" thing i keep reading about?
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VincentHill
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posted June 07, 2003 04:01 AM
Other than read in the Library, what else can you do??
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swft
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posted June 07, 2003 05:10 AM
I remember trying 18/43 on the street. No probs on takeoff, but it definately calmed the bike down as far as wheelies. Noticeable difference in top speed as well. Got to whack it good a couple times, saw 190+. Figuring that the speedo was prolly pretty close, compared to the stock 18/46 gearing, I'd imagine that I was going just about that fast. 
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GOZR
Zone Head
GOZR
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posted June 11, 2003 09:27 AM
I remember i was doing the same when i was racing Mopeds.
For fun we tried all kind of sprockets ...
I was doing 85 mph that was unbeleivable at the time for those kinds....
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-G
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