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1981 LTD 1000 HP

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20 Jan 2024 05:43 #894205 by KZNewbie76
1981 LTD 1000 HP was created by KZNewbie76
I did not really know where to put this thread so I put it here. I have seen on different places that the 81 Jay motor has 102 horsepower and then I've seen it have 95 horsepower in other places. What is the actual horsepower on the 1981 at the crankshaft and at the wheel. Thank you very much

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20 Jan 2024 07:20 - 20 Jan 2024 07:22 #894211 by TexasKZ
Replied by TexasKZ on topic 1981 LTD 1000 HP
The answer depends on which engine and which model you are asking about.

There were basically three KZ1000 engines, and at least a couple of versions of each one.

First was the KZ1000 (1015cc) that was an outgrowth of the KZ900.
Next was the MKII (1015cc) that was an improvement of the previous version.
Finally, these engines were replaced by the so-called J engine (998cc). The change happened in 1981, except for the copcycles that waited until 1982 to get the new engine.

Each of these engines had slight variations depending on application. For example, the 1981/82 LTD and CSR were rated at less horsepower than the KZ1000J of those same years. Yes, there is a J model motorcycle and a J model engine. Crazy, eh?

So far as I know, Kawasaki has never publicly stated where the power is measured, but it seems that the general suspicion is at the crankshaft. Rear wheel measurements will be around 10% less.

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24
Last edit: 20 Jan 2024 07:22 by TexasKZ.
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  • DOHC
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20 Jan 2024 07:54 #894214 by DOHC
Replied by DOHC on topic 1981 LTD 1000 HP
The factory service manuals from this time period give HP and torque numbers for each model.  As TexasKZ said, they don't say where it's measured, but I'm guessing it's at the crank.

KZ1000, Mk1 and Mk2
1978 KZ1000A2A:  83 HP, 8.1 kg-m torque
1980 KZ1000A4:  93 HP, 9.1 kg-m torque
1980 KZ1000D3:  94 HP, 9.2 kg-m torque
1980 KZ1000H1: 96 HP, 9.1 kg-m torque

"J Motor" bikes:
1981 KZ1000J1: 102 HP, 9.3 kg-m torque
1981 KZ1000K1/M1: 92 HP, 8.7 kg-m torque

The internals of early motors were basically the same (say between the 78 and 80 KZ1000-A), but the carbs and exhaust changed between models.  I'm not sure where the extra 10 HP came from between 1978 and 1980 for the A model.  

For the 1981 "J" engine, the J1 looks to have different camshafts than the K1 (LTD) & M1 (CSR).  That probably explains the difference in power.  It may also have a different exhaust.

'78 Z1-R in blue , '78 Z1-R in black, '78 Z1-R in pieces
My dad's '74 Z1
'00 ZRX1100
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20 Jan 2024 08:05 #894215 by Nebr_Rex
Replied by Nebr_Rex on topic 1981 LTD 1000 HP
The LTD and CSR have shorter duration camshafts.


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2002 ZRX1200R
81 GPz1100
79 KZ1000st daily ride
79 KZ1000mk2 prodject
78 KZ650sr
78 KZ650b
81 KZ750e
80 KZ750ltd
77 KZ400/440 cafe project
76 KZ400/440 Fuel Injected

www.dotheton.com/forum/index.php?topic=39120.0


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20 Jan 2024 10:28 #894223 by Wookie58
Replied by Wookie58 on topic 1981 LTD 1000 HP
The "J" has an extra 0.9mm of lift on the inlet and 0.5mm on the exhaust plus 10 degree's duration over the Ltd and CSR (I have a pair of inlets for my build  )

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20 Jan 2024 10:32 #894224 by zed1015
Replied by zed1015 on topic 1981 LTD 1000 HP

  I'm not sure where the extra 10 HP came from between 1978 and 1980 for the A model.  


 
The extra 10-ish hp for the 78 Z1R , LTD and later 1015cc bikes was mostly down the increase in carb size from VM26 to VM28.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
www.kzrider.com/23-for-sale/611992-air-c...lide-mikunis?start=0





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