gear ratio (sprocket) brain twister HELP !!!!! - Kawasaki Forum :: KawasakiWorld.com
 
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post #1 of 8 Old 01-27-2009, 05:01 PM Thread Starter
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Question gear ratio (sprocket) brain twister HELP !!!!!

Help!! I have a bit of a complicated gearing puzzel to figure out Im a newbie to this forum and could realy use the help!!
I have a 04 636 in a golf cart and am trying to figure out what size sprockets to use,heres the specs.
1st 2.923 38/13
2nd 2.025 37/18
3rd 1.666 35/21
4th 1.450 29/20
5th 1.272 28/22
6th 1.153 30/26
Final drive ratio 2.866 43/15
overall drive ratio 6.255 @ top gear

Heres where it gets wierd for me. The rearend im using has a 7to1 ratio with reverse. and the tire diameter is 24"
I would like to have a top speed of around 70. Giving me a low end for trail riding and rock crawling Thanks for your help
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post #2 of 8 Old 01-27-2009, 05:38 PM
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Gearing Commander: Motorcycle Gearing Ratio Sprocket RPM Speed Chain Calculator

plug in all your info

2002 ZX-12R Blue w/ Ghost Flames (thats 5 extra hp!)
"Do a wheelie!" -moron
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post #3 of 8 Old 01-27-2009, 05:46 PM
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whats the theoretical top speed of of the 636 with stock gearing? whats the tire diameter? stock sprockets?

01 ZX-12R 8.84 @ 156.3 on dot tires, NA.... turbo 8.47 @ 164
00 ZX-12R 8.62 @ 165.2 no bars, slicks, 55 shot... turbo 8.32 @ 173
00 ZX-12R 1: 222.046 1.5: 226.390 Worlds Fastest NA Kawasaki
00 ZX-12R street turbo 1: 227.9 1.5: 234.1
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post #4 of 8 Old 01-28-2009, 02:37 PM
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I’m a bit confused by your overall drive ratio. Also, you’re missing the primary drive ratio; according to the specs on for a 2004 ZX6RR, the primary ratio is 2.022.

(edit...OK, so you're saying that your primary ratio is 1.893 by giving the overal ratio in sixth as 6.255. That makes sense since the 636 is supposed to have a bit more grunt. I'll update the numbers below to reflect the taller overall gearing)

Basically it works like this: RPM divided by the product of the gear ratios divided by inches in a mile multiplied by pi multiplied by tire diameter multiplied by minutes in an hour. Taking this format, your top gear looks like this with the stock sprockets: 15,500 / (1.153x1.893x2.866x7) / 63360 x 3.1416 x 24 x 60 = 25.27 MPH @ 15,500 RPM in sixth. If you change your sprockets to achieve a 1:1 ratio, you’ll finally be up to 72.44 MPH at max RPM in sixth.

Even at that, your gear breakdown looks like this: 1st = 28.57 MPH, 2nd = 41.24 MPH, 3rd = 50.13 MPH, 4th = 57.60 MPH, 5th = 65.66 MPH, 6th = 72.44, all at max rpm.

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Last edited by Rotty; 01-28-2009 at 04:03 PM. Reason: Correct primary drive ratio
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post #5 of 8 Old 01-29-2009, 05:53 PM Thread Starter
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WOW!!! Thanks rotty. Thats just what im lookin for. one more question. What size sprocket combo would you recomend I start with. Im thinking that 2- 15tooth sprockets would give me 1 to 1. Is this correct or am I way off. Thanks again, I think ive inhaled a few too many paint fumes over the years!!!!
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post #6 of 8 Old 01-30-2009, 01:45 PM
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You're correct. The same size on front and rear is 1:1 and since you already have one 15 tooth sprocket stock, I'd suggest you try to fit a 15 tooth to the rear. One thing you'll need to check is if you can actually fit a tiny 15 tooth sprocket on the rear. If you can't, you'll need to increase the sprocket size until it does fit. The thing you'll need to watch out for with this is to make sure the sprocket doesn't get too big to fit on the front.

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post #7 of 8 Old 01-30-2009, 02:04 PM Thread Starter
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Smile

Thanks again. Im buying a 3" offset 15 tooth off ebay for the counter shaft, and I took apart the original pully on the golfcart rear end ad removed the splined hub to put the rear sprocket on. the outaide diameter is 1.5" so its plenty small enough for a 15 tooth.Ive got quite alot done on the cart, The full cage is compelete, The 04 polaris predator front end is refabed and installed with fox adj coil overs. I will have hydrolic brakes all the way around. I will keep posting as it progresses, and as soon as I figure out how to post pics I will. Thanks for all youre help. now I can move forward with the build!!
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post #8 of 8 Old 02-02-2009, 06:57 PM Thread Starter
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Today I set up the rearend on the swing arm, I also repositioned the shocks with multiple mounting holes so I can change the angle, wich will change the spring rate for diferent conditions.Im looking for a spedo,zx12 radiator,fuel pump,and light switch.
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