TOPIC:

i have been doing some research. i have found that the 900 cranks (some i think) have 15 teeth on the crank for the cam chain.

my question is this. does a '77 kz1000 crank have 15 or 16 teeth on the crank?

i am trying to figure out if i can put a 900 crank in my '77 1000.

i have been told that i could do this, but then i found the different teeth numbers for the cam chains.

let me know ,

thanks!!!

I should learn to read better

Post edited by: Duck, at: 2006/02/12 15:21

All the Z1 and KZ900 engines use a 15 tooth 'porkchop' crank - these cranks are relatively light (by comparision) and have 30 tooth cam sprockets.

The all 1977 and 78 KZ1000's use a full flywheel crank with 15 tooth crank - these cranks are heavy suckers - great torque, slower revving. Totally interchangeable with the Z1/KZ900. However, the rotor attachment bolt thread changed in 1978 from 8mm to 10mm.

In 1979 and 1980 it gets more confusing. The Mk II motors use a 16 tooth crank with 32 tooth cam sprockets. The Mk II motors were in the 1979 & 80 KZ1000-A3 & A4, the 1980 KZ1000-B4, the 1980 & 1981 KZ1000-C3 & C4 police bikes, the 1980 KZ1000-D3 (Z1R), the 1979 & 1980 KZ1000-E1 & E2 shaft bikes, and the KZ1000-G1 (Z1 Classic). Note they are not in the 1979 KZ1000-B3 LTD model.

The 1979 & 1980 models use a different stator/rotor arrangement.

so if i read that corretly jeff. an earlier 900 crank ('77 and earlier) will drop right into my '77 1000 engine ? and be lighter and rev up faster.

is this correct?

drops right in there!

thnaks for all your help guys. i think i have it all now.

-'77 kz1000
-kz900 crank welded
-1075 kit 10.25:1
-k435 cams (still looking into 410 cams not sure yet!)
-mikuni 34 carbs
-ported heads
- oil cooler set up

thanks for all of the help from all of you!!!!!!!

i will post pics when it all starts, gotta buy parts, this may take some time.

If your 77 is or was a running motor, just count the teeth on the cam sprocket and that will tell you which crank sprocket you have.

Jay

ape jay, what do you think about running the k435 cams in a 1075?

sbjones wrote:

ape jay, what do you think about running the k435 cams in a 1075?

If the motor has a good ported head, it will be a rocket with 435s.

Jay

just don't expect it to cruise around town under 5,000 rpm...