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kz1000 street racer gearing ??? What sprockets ?? 09 Apr 2008 08:59 #205196

  • galaxian
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On my 1000 i am running a 17/45 = 2.65 ratio on a 530 chain. I just put this on and have not had a change to ride it yet.
1977 KZ1000A1, 1979 KZ650 C3

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kz1000 street racer gearing ??? What sprockets ?? 09 Apr 2008 12:21 #205232

  • racer54
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Plummen...when you gear your turbo, it needs opposite of what a N/A bike does...if you are trying for low times. A turbo likes a load to build boost, so you need to gear it high (bigger countershaft sprocket and/or smaller rear sprocket). Go this way in your gearing and it will build boost faster but it will be harder to start off because of the higher gearing...trade-off time. Gives fantastic top-end...makes those new sportbikes look twice when they figure you are history and look over and you are still there and even pulling them some. LOL A regular bike needs a lower gear set-up (smaller front sprocket and bigger rear sprocket) to get better times. It will move easier and get to speed faster but you limit your top-end as you mentioned. Also, remember that on a turbo, if you are on power and the front end comes up, you have to shut it down to return to earth. On a all-motor bike,you can shift and the front will return to terra firma because of the higher gear but a turbo will just keep building boost if you shift becasue of the higher gear putting more load on motor. Don't ask how I know...
1980 LTD (changed over the years), 1979 LTD (being rebuilt), 1977 KZ turbo and various KZ's in various states of build. KLX110

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kz1000 street racer gearing ??? What sprockets ?? 09 Apr 2008 12:54 #205239

  • PLUMMEN
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im trying to use the torque of the bigger motor to keep it interesting when the boost is turned down so i can keep it easy to drive:P around town .im only running a 3" over arm and non raked frontend so im gonna be more into screwing with the sportbikes from a rolling start and cracking her open so i need to figure out a happy medium for my gearing i guess;)
Still recovering,some days are better than others.

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kz1000 street racer gearing ??? What sprockets ?? 09 Apr 2008 21:33 #205354

  • kzstreetfighter71
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now that wer all here and on the issue what would a 630 chain with a 15/33 be like?

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kz1000 street racer gearing ??? What sprockets ?? 09 Apr 2008 22:08 #205358

  • Patton
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Per FSM's: US models Z1-KZ900 oem = 35/15 (2.33 final reduction ratio); Euro models 33/15 (2.20 frr); 77/78KZ1000-A1/A2/D1 oem = 33/15 (2.20 frr); 79A3/D2 = 35/15 (2.33 frr).

So 33/15 would be slightly taller gearing (due to smaller rear sprocket) than 35/15.


Here's an excerpt from Z1E --

Changing Chain & Sprockets

Different sprocket sizes - larger or smaller - what is the impact to performance?

Final drive ratio.
Divide the rear sprocket tooth count by the front tooth count and you have the final drive ratio. For example: 35 / 15 = 2.33:1

If you want to change your gearing, you can calculate the impact of the change before you purchase the new sprockets.

For example; your bike cruises at 60 mph / 4,000 rpm and has a final drive ratio of 2.33:1 - if you want more acceleration, putting a 37 tooth sprocket on the back and leaving 15 on the front changes the ratio to 2.47:1 (37 / 15 = 2.47:1). Divide your cruising RPM by 2.33 and multiply by 2.47. Using the example from above, 4,000 rpm becomes 4,240 rpm at 60 mph.
1973 Z1
KZ900 LTD

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Last edit: by Patton.

kz1000 street racer gearing ??? What sprockets ?? 10 Apr 2008 06:14 #205384

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so if your ratio is low like 2.2 it will have less acceleration but a higher cruising speed but a ratio os 2.5 will pull off faster and go through the gears quicker but rev higher on cruising speeds on the highway?

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kz1000 street racer gearing ??? What sprockets ?? 10 Apr 2008 06:20 #205385

  • Chopperdaddy
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i just ordered the 17/45 530 from z1 I wanted the 18/47 like mentioned but they didnt have a 47, 45 was as big as they had so i stepped the front down. .
Into all things fast. . . Drag boats, bikes and cars . .. sucker for 50\'s thru 70\'s style also

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kz1000 street racer gearing ??? What sprockets ?? 10 Apr 2008 08:20 #205409

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kzstreetfighter71 wrote:

so if your ratio is low like 2.2 it will have less acceleration but a higher cruising speed but a ratio os 2.5 will pull off faster and go through the gears quicker but rev higher on cruising speeds on the highway?


Sometimes helps to recall the various front and rear sprockets on a multi-geared bicycle, with pedal sprockets likened to motorcycle countershaft sprockets. When chain runs on the smallest front pedal sprocket and largest rear wheel sprocket, that is the lowest available gearing with more rpm pedal speed for any given road speed. Conversely, when the chain runs on the largest front pedal sprocket and the smallest rear wheel sprocket, that is the highest available gearing with less rpm pedal speed for any given road speed. :)
1973 Z1
KZ900 LTD

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kz1000 street racer gearing ??? What sprockets ?? 10 Apr 2008 09:23 #205426

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Chopperdaddy wrote:

i just ordered the 17/45 530 from z1 I wanted the 18/47 like mentioned but they didnt have a 47, 45 was as big as they had so i stepped the front down. .


GPzInfested's 79 KZ650/GPz750 has 18/45 on it right now, but he's going to change the front sprocket to the 17 so he can get the front wheel up. So you ought to have plenty of acceleration with the 17/45 combo on a 1000.
KD9JUR

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kz1000 street racer gearing ??? What sprockets ?? 13 Apr 2008 06:49 #206087

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I run a 37t on the rear and a15t on the front on a 1105 with a stock swing arm. Pulls like a frieght train, but stops around 135? Never looked! But I turn around 4300rpm at 60mph. It buzzes real hard,but the exhaust note "SWEET"! It s your own personal preference on what you want and how you ride.
1980 kz1000g 1105 34mm Mikuni flat slides Kerker exhaust custom paint stock ignition(Dyna 2000 soon) Accel coils and wires stock cams w/ heavy springs for more rpm. My 2nd 1000.

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kz1000 street racer gearing ??? What sprockets ?? 13 Apr 2008 07:18 #206096

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i know its my preference but i need a baseline or starting point if you will, its really easy to change one or the other sprocket to dial it in but asking guys with similar bikes and riding style i knew they could point me in the right direction.
Into all things fast. . . Drag boats, bikes and cars . .. sucker for 50\'s thru 70\'s style also

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kz1000 street racer gearing ??? What sprockets ?? 18 Jun 2012 16:15 #530117

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I run 18/36 530 chain 02 gsxr rear wheel 180/55 metzeler tire rest is 79 kz 1000
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