Numbers Don't Match? What bike is the Engine from?

13/33 630 chain is stock, but I am switching to a 16/38 530 chain on mine.

I don't think I have an LTD engine. I've now read that LTD Engines have a KZ750HE##### serial numbers and the 750E has the KZ750EE###### engine serial numbers

If this is correct, that would indicate that my engine is not an LTD engine, but rather an engine out of a KZ750E. If this is true. Is there any difference between the two? It seems that info on this forum suggest same compression ratio, same cams, same everything, but how about the gear ratio in the transmission? Let's go back to my original post. The countershaft sprocket that I was told was the proper Stock size did not fit on the bike. 630 15 tooth. When I put that sprocket on, there was no space for the chain to travel around the sprocket with the chain guard mounted on the engine case. I've gone down to a 13 tooth 630, and now I'm running 5500 RPM at 60 MPH. This seems wrong. Either there's a difference between the HE and EE engine/Transmission or there's an error elsewhere. Dennis Kirk also shows the proper chain for the bike to be a 630.

Hmmm.

germanpickle wrote:

I don't think I have an LTD engine. I've now read that LTD Engines have a KZ750HE##### serial numbers and the 750E has the KZ750EE###### engine serial numbers

Where did you read that LTD motors had that VIN series?

Even the 83 GPz750 motor says KZ750EE, and it's about as different as a 750 four can get

I don't know who told you a 15 tooth 630 sprocket was stock, but I'd suggest not listening to them again

Go to kawasaki.com and look at the parts diagrams for yourself, all the info is there.

Mcdroid wrote:

germanpickle wrote:

I don't think I have an LTD engine. I've now read that LTD Engines have a KZ750HE##### serial numbers and the 750E has the KZ750EE###### engine serial numbers

Where did you read that LTD motors had that VIN series?

1980 KZ750 LTD kzrider.com/content/view/63/48/ - Shows the motor to be a KZ750HE VIN
1980 KZ750 Standard-4 - kzrider.com/content/view/62/48/
Shows the motor to be a KZ750EE vin.

steell wrote:

Even the 83 GPz750 motor says KZ750EE, and it's about as different as a 750 four can get

I don't know who told you a 15 tooth 630 sprocket was stock, but I'd suggest not listening to them again

Go to kawasaki.com and look at the parts diagrams for yourself, all the info is there.

That was part of my problem. Kawasaki.com doesn't have the diagrams for the 1980 LTD-4 The only 1980 750 they show is the 750 LTD-2

germanpickle
I went through my Haynes manual checking all the various specs and have understanding that the E1 and LTD engines were one and the same... regardless on what anyone says on engine #.
I then opened both of the links you gave and can see also that the specs are identical with one small exception - the final drive ratio.
E1, 2, 3 = 2.54:1 (33/13) rear sprocket/front sprocket
H1,2 & 3 = 2.46:1 (32/13)

This would seem to indicate that the engines are identical but the rear sprocket differs. I wonder if the rear wheel on the LTD is a different size. Most likely this would explain the smaller rear sprocket size on the LTD.


Regarding kawasaki.com and the 750/4s the trick is to enter the year as 1982. This will give you four choices
Standard fours
LTD 4s
Spectre (shaft) and
CSR twin
Clik on each of these and you can find the 1980 models. Trust me. From what I found there the E1 and all 1980 - 82 4 cylinder 750s have the same 13 tooth front sprocket part #.

Hope this helps.
Good luck

LTD has a 16" rear wheel, 750E has an 18", and the 83 GPz750 (ZX750A1) was the first 750 to use a 15 tooth 630 sprocket, the 15 tooth won't fit the earlier models (clutch release is different on the GPz).

The thing to remember when searching for pre 1983 750 fours on kawasaki.com is they state the displacement as 740, and not 750. in 83 750 covers fours and twins.



KZ750-H1 LTD (1980)
22 13144-1033 ENGINE SPROCKET,13T 1

Post edited by: steell, at: 2007/06/08 00:04

JR wrote:

germanpickle

I then opened both of the links you gave and can see also that the specs are identical with one small exception - the final drive ratio.
E1, 2, 3 = 2.54:1 (33/13) rear sprocket/front sprocket
H1,2 & 3 = 2.46:1 (32/13)

I missed the final drive ratio on the pages. That tells me what I want to know. I have the 33 tooth rear sprocket. I think I'll go down to the 32.

I don't think you will even notice the difference between a 13/33 and 13/32, it's probably less than 150 rpm at 60 mph.

I have an '81 KZ750H2 LTD with the 13/32 sprocket combo with a 630 chain.
At 60mph in 5th I am at 5300rpms not 5000rpms.
I posted earlier, then doubted myself. :huh:
So, I took it upon myself to find out. I rode an extra 35 miles to work this morning so I could check, re-check and re-check somemore.
Steell was right, dropping a tooth would knock you down from 5500rpm to ~5300rpm. I also found out that at 9500rpm in second puts you around 57mph.

Post edited by: cafekz750, at: 2007/06/08 12:20