Ok it’s found a new home. Here is how I found it. No time to dig into it other than looking at the cams and pistons for aftermarket stuff. Appears bone stock. 66mm bore and no noticeable markings on the cams
The barrels may have been bored, but there is definitely a 903 scribed on the front. The engine could also be a 73 to 75, or it could be a KZ engine but the cam cover is definitely Z1. The ends of the cover are nicely rounded. KZ covers are also rounded but they have a definite ring on them. The carbs are not Z1 but they could have been added to an early Z1 engine afterwards. Assuming they were put on the engine at the factory makes this a Z1 engine from 1976.
I'm 99% positive the engine is a Z1 and 90% positive it's a '76.
I have a couple of Z1B's restored, an '80 KZ1000LTD restored, a 1981 KZ550 restored and a 2008 KLR 650 for off road fun. My wife has a 2019 Suzuki DR 650 for on and off road.
Ser # on the case pad is difficult to make out, but appears to start with Z1E 03(8?) 4xxx . That, and the long (appears to be 80mm), smooth (no knurling), raised - shoulder (not flat edge-to-edge) pad would indicate Z1-A or KZ900, depending on the 3rd. digit. The question is what is the third digit (3 or 8) of the ser. #? That would go far to identifying it's production era.
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.
slmjim+Z1BEBE wrote: Ser # on the case pad is difficult to make out, but appears to start with Z1E 03(8?) 4xxx. The question is what is the third digit (3 or 8) of the ser. #? That would go far to identifying it's production era.
slmjim & Z1BEBE
Slim Jim, the black cased engine is the one I purchased the serial number is Z1E 034XXX. I thinks it’s a Z1A900. Appears to be bone stock. Haven’t really had time to dig into it yet. Your input is welcome
Mikaw wrote: I've seen that NOS 900 listed before a few months ago...
It's not unusual to advertise things for over a year in order to get rid of them. That motor needs a collector to justify spending that much moolah on a NOS engine. Not surprising he is shaking the CL nut tree hoping for a buyer with $7K to fall out with his wallet open.
1981 Kawasaki Kz1000K1
Located in the Saint Louis, Missouri Area.