KZ1100 HEAD ON KZ1000J

Please can someone inform me, can you put a KZ1100 head directly onto a KZ1000J cyclinder with out changing much, valves etc ....Head is a KZ1100 A1 and the bottom is a KZ1000J.

No.

The first example is simply a big bore Z1 900. This engine came with a kick starter and electric starter. The cam chain tensioner hole in the cylinder block is a rectangle. The ccs cast on the cylinder is 1015. The later "J model" has no kick starter, and the cam chain tensioner hole in the cylinder block is round. The cc's cast on the cylinder is 998. This engine also became the GPZ1100 in 1981 and '82, and virtually everything between them is the same. (The '83-'84 GPZ1100 was changed). Cylinder blocks and lower engine cases are NOT interchangeable. You can not put a J model cylinder on an older style lower end, and vise versa.

www.aperaceparts.com/tech/techkz1000.html

Actually, I take that back- I was looking at cylinder blocks. It looks like it's possible to swap heads, people put J heads on KZs all the time. Why would you want to out a KZ head on a J model though?

Sure, you can swap those heads. They are 100% identical in every way with exception possibly of color. The KZ1100 A1 IS a "J" motor with a shaft on it instead of a chain and sprocket. The heads are the same.

kz1100warrior wrote: Please can someone inform me, can you put a KZ1100 head directly onto a KZ1000J cyclinder with out changing much, valves etc ....Head is a KZ1100 A1 and the bottom is a KZ1000J.

I would rather put the KZ1100 cylinder block on the KZ1000 J motor, going from 998 cm3 to 1089cm3.

Mookachacka wrote:

kz1100warrior wrote: Please can someone inform me, can you put a KZ1100 head directly onto a KZ1000J cyclinder with out changing much, valves etc ....Head is a KZ1100 A1 and the bottom is a KZ1000J.

I would rather put the KZ1100 cylinder block on the KZ1000 J motor, going from 998 cm3 to 1089cm3.

x2

Mookachacka wrote:

kz1100warrior wrote: Please can someone inform me, can you put a KZ1100 head directly onto a KZ1000J cyclinder with out changing much, valves etc ....Head is a KZ1100 A1 and the bottom is a KZ1000J.

I would rather put the KZ1100 cylinder block on the KZ1000 J motor, going from 998 cm3 to 1089cm3.

Ditto + a nicely ported head with some 410 cams and... whoops there goes my inheritance lol.

Read this: www.aperaceparts.com/tech/techkz1000.html

Thanks for the response, the reason, is that my block from the 1100 is kaput, my head is fine, on my 1000 motor my cam bolts are kaput, so want to just swap out heads , money tight before xmas, and need to get bike on road.....thanks all

id love to put a J head on an 80 and down 1000/900 cause of the kickstarter. So many rides where i had to push 600 pounds of iron up the street just to get going when my starter took a dump

Kitten Tooth wrote: id love to put a J head on an 80 and down 1000/900 cause of the kickstarter. So many rides where i had to push 600 pounds of iron up the street just to get going when my starter took a dump

:laugh: :laugh: :laugh: Fix it right the first time... kidding.

So I currently have a kz1000j motor.
Want to swap a bad jug for a 84 gpz1100 jug with pistons
is that doable?