Not sure what these pistons go to? 1030 bore?

Good afternoon.
I recently purchased a Z 1 900 and lots of additional parts were included. These pistons do not fit the 903 barrels are just a touch larger, maybe 1030? Can anyone tell me what these may go to, on the piston near the pin is stamped ART on one side and KL250 on the other. SD is stamped on top with an arrow.. Photos attached.
Thanks for the help.

 

KL250 Means they are z1000 pistons.

1977 TO 1980 KZ1000 [ 1015 ]

KL250 - I had one of those, a single cylinder scranbler thing, back in 1985 or so. Is it the same piston as in the Z1000? 4 x 250, it'd make sense I suppose.

Ian

wrote:

KL250 - I had one of those, a single cylinder scranbler thing, back in 1985 or so. Is it the same piston as in the Z1000? 4 x 250, it'd make sense I suppose.

Ian

Yes! That's exactly what they did..