1981 KZ750 LTD Engine Replacement/Swap

Hey Guys,

So As some may know I managed to blow my motor last week.

I would like to know which engine I can drop in place that will fit this bike with not many headaches.

Or if anyone has a 750 motor for sale :laugh: :woohoo:

IIRC that engine was made from 1980 to 1985. In cruiser, standard and sport models, with various styling, such as Spectre, GPz, LTD, etc. I would think any 750 chain drive in that series would fit into your frame.

Any KZ700/750-4 chain drive, most likely.
Other possibilities. ZR750 -->> ~91-93 Zephyr & ~2000-2002 ZR7/ZR7S (air cooled models).

Which one has the most horses? Also if I look at Engines outside of my model what kind of changes am I looking at to make a different engine work?

I'm pretty sure the 80-83 750E Standard & 750H Ltd will be an exact fit. Any fitment problems with the other chain drive models would be in regards to the engine mounting points. The 83 GPz might be different, since I don't think it uses the same engine guards (which probably indicates different mounting points???).

As for horsepower, it seems like a ZR750 would be higher, but I checked one time & the ZRs are in the 75-78 range which is about the same as the KZ750. The ZR750 engine is based on the KZ750. The ignition system is probably different, but I'd guess that wouldn't be a problem. I mentioned the ZR because I'd like someone to try it, to confirm whether or not it can be done & how easy it will be.
..................................

I checked the various years and it seems the horsepower of all the 2 valve 750-4 engines remained pretty much constant. Not sure on the mounting of the engine of GPz vs. KZ, but the 83-85 GPz had the highest horsepower rating.
Really, though, if you want more power get a KZ1000 and be done with it. While I really prefer my GPz over my 81 KZ750E, neither comes close to the power of my 83 GS1100E. No replacement for cubic centimeters.

Not sure where you are located, but there is an engine/frame for sale in Illinois, just north of Chicago, in the For Sale section of this forum.

True. But it may be cheaper to replace the engine than to buy a new bike. Plus, he'd be keeping one on the road.

There's a 750 engine listed for sale here on KZR. The VIN lookup a Kawasaki.com indicates that it is 82 KZ750-H3.
edit: frame reported sold; not sure about the engine which is missing the valve cover; if it is available, I would get more info about it... who knows what's wrong w it???

martin_csr wrote: True. But it may be cheaper to replace the engine than to buy a new bike. Plus, he'd be keeping one on the road.

There's a 750 engine listed for sale here on KZR. The VIN lookup a Kawasaki.com indicates that it is 82 KZ750-H3.

He just reported it sold.

What is wrong with your motor?
Knocking, smoking, seized?

Sorry to hear about your motor. Mine blew at the end of last summer and ive spent all winter working to rebuild it. Some parts are pretty easy to find and affordable on a budget, while some are really hard to find if at all. Just thought id throw that out there if you were thinking of rebuilding. Good luck.

I know wheres theres a few gpz 750 motors . Two of my friends have extra motors . One in new hampshire has a bottom end and one in R.I who has one complete . Pretty sure they would bolt right in .

Ha HA just realised this is a three year old thread .