KZ1000 rpm at speed?

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09 May 2009 15:17 #289428 by nickcycle
KZ1000 rpm at speed? was created by nickcycle
I have a '79 kz1000. Finally switched back to stock 33 tooth gear in back, down from 35. I'm wondering if anyone could tell me what my RPMs should be at cruising speed on freeway (75 or so mph)? Just seems a bit high yet- right now at about 4500 @ 65/70 mph. Any thoughts?

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09 May 2009 16:22 #289442 by bountyhunter
Replied by bountyhunter on topic KZ1000 rpm at speed?
Doesn't sound high to me. My 750 twin spins 5000 @ 70mph with stock gears.
1979 KZ-750 Twin

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09 May 2009 16:38 #289463 by IowaKZ
Replied by IowaKZ on topic KZ1000 rpm at speed?
My G1 1000 cruises about 60-65 mph @ ~ 4k

All stock
1980 G1 Classic
Bettendorf, Iowa

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09 May 2009 22:35 #289703 by nickcycle
Replied by nickcycle on topic KZ1000 rpm at speed?
Thanks guys, I guess what I'm really asking is: Can I cruise for extended periods at 80-90mph if that puts me at 6000-6500rpm?

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09 May 2009 23:55 #289730 by kpier998
Replied by kpier998 on topic KZ1000 rpm at speed?
Yes, assuming the engine is in good shape, that shouldn't be a problem. Years ago, I read that an engine is usually built to run continuously at it's peak torque rpm without placing undue stress on the internals. How close to peak torque would 6500 rpm fall?

According to this site, it will probably be near peak torque:
www.bikez.com/motorcycles/kawasaki_kz_1000_ltd_1979.php

If yours is not an LTD, then it might be slightly different.

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  • larrycavan
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10 May 2009 06:19 - 10 May 2009 06:21 #289760 by larrycavan
Replied by larrycavan on topic KZ1000 rpm at speed?
79 LTD 1000 @4500 RPM engine speed

With 33/15 gearing and 79" Circumferance rear tire:
5th = 72.4 MPH
4th = 64.0 MPH
3rd = 52.9 MPH
2nd = 40.3 MPH
1st = 27.9 MPH

5th gear @8500 RPM = 136.8 MPH
5th gear @6214 RPM = 100.0 MPH


With 35 /15, same tire

5th = 68.3 MPH
4th = 60.4 MPH
3rd = 49.9 MPH
2nd = 38.0 MPH
1st = 26.3 MPH

5th gear @8500 RPM = 129 MPH
5th gear @6591 RPM = 100 MPH
Last edit: 10 May 2009 06:21 by larrycavan.

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13 May 2009 08:25 #290783 by nickcycle
Replied by nickcycle on topic KZ1000 rpm at speed?
Thanks everyone. I realized that the prev. owner of my bike had also put a 14T sprocket in front instead of the stock 15T. I'm changing that out today, will see how it goes. Hopefully that will put me somewhere around 5500- 6000RPM at around 85mph. Should be okay for cruisin the freeway?

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13 May 2009 10:48 #290812 by Bicycle Lee
Replied by Bicycle Lee on topic KZ1000 rpm at speed?
what about 41 rear and 15 front?
Is there a table of this info somewhere on the web?
1978 KZ1000 police

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16 May 2009 13:53 #291695 by Bicycle Lee
Replied by Bicycle Lee on topic KZ1000 rpm at speed?
Anybody??
1978 KZ1000 police

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  • Royal1MC
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  • Is it just me, or is it just great to be on a KZ
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16 May 2009 14:43 #291706 by Royal1MC
Replied by Royal1MC on topic KZ1000 rpm at speed?
Bicycle Lee wrote:

what about 41 rear and 15 front?
Is there a table of this info somewhere on the web?



Try this link, just fill in info on you bike, and put any custom gearing you want to use.

www.gearingcommander.com/
*1980 Z1-R (current))
*1978 KZ1000 LTD w/ Z1-R frnt end (sold)
*1977 KZ650 B1 (sold)

Los Angeles, CA

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16 May 2009 15:55 #291729 by timebomb33
Replied by timebomb33 on topic KZ1000 rpm at speed?
14 41 gearing is what i use on my little drag bike it is good for around 125 mph top speed but if you run that gearing on the street it will be very buzzy and not super comfortable to ride i prefer 15 33 or 35 on the street my self.
1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE

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  • larrycavan
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16 May 2009 18:45 #291762 by larrycavan
Replied by larrycavan on topic KZ1000 rpm at speed?
timebomb33 wrote:

14 41 gearing is what i use on my little drag bike it is good for around 125 mph top speed but if you run that gearing on the street it will be very buzzy and not super comfortable to ride i prefer 15 33 or 35 on the street my self.


Me too.

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