76kz900 cases 78kz1000top end

need help!!! I have a 76 kz900 w/original motor needs top end, but I want to know is there any extra work involved with putting complete top end from my 78kz1000.

ya need to split the cases and open the bores in top cases up a little bit to clear bigger sleeves;)

thanks I was told that I could just take my head,jugs and pistons off the 900 and swap for the 1000 parts with no modifications.

wireman wrote:

ya need to split the cases and open the bores in top cases up a little bit to clear bigger sleeves;)

I don't think You have to...do You?
I thought the 900 cases(same era) were the same size as the 1000...:huh: ...

might be really close,but im gonna say it needs a little clearancing and i aint no fan of metal filings in crank bearings!:Pmax size on 900 sleeves is 1015 and that leaves very little meat,max size on a 1000 sleeve is 1105 so they are definately a little bigger;)

Post edited by: wireman, at: 2007/04/22 18:37

Just checked with the cross-ref program.
Here's what it lists for the cases:P ...

Sandy,

Is that part # a superceded part? If so they could just used updated cases for the 1000's and just back dated their fitment chart.

Later, Doug

Both 14001-5022 and 14001-5025 (both #'s listed for the cases) are crosslisted for all sorts of air-cooled 1000's and 900's including the KZ900A4. However, my KZ1000A1 jugs do not fit in my Z1A cases...it will take some machine work.

StreetfighterKz wrote:

Sandy,

Is that part # a superceded part? If so they could just used updated cases for the 1000's and just back dated their fitment chart.

Later, Doug

I have no idea,Doug.
I took the part # from the Kawi site,and entered it into the Zedder cross ref program,and that's what it came up with,Bud.
I have a 900 engine with the jugs off.I believe the engine to be an earlier 900(74),so if Anyone has a 1000 case with the jugs off,We could do a measurement comparison...:whistle: ...

and for thr record, you dont have to have them machined/bored. you can do it youself with a dremmel. just make it big enough for the cylinders to slide down all the way. i did the same thing fitting a 750 block and sleeves to my 650 cases

Sandy wrote:

I have a 900 engine with the jugs off.I believe the engine to be an earlier 900(74),so if Anyone has a 1000 case with the jugs off,We could do a measurement comparison...:whistle: ...

This bothers me too...(well, not really ) and as soon as I pull the pistons off the rods in my 1000 cases, I'm going to measure both my 1000 and Z1A cases and post the differences.

Good call,Bud.
I'll measure the cases on the 74 900 and post what I find too.

What year is YOUR 900,Mcdroid...just so We know?...

Post edited by: Sandy, at: 2007/04/23 11:26