transmission ?

531blackbanshee wrote: any kz/z1 head from a 900/1000 will fit.

also pull the cover behind your counter shaft sprocket.make sure the out put shaft bearing is not broken.i had the one in my 1980 z1r crack around the circlip groove and the cage came off letting the bearings"stack"up on one another which allowed enough slack for the output shaft to jump around in first and second.

i have seen another 78 z1r with the same problem.

leon

most of the time this will happen when running chain to tight putting all the stress on the output bearing

that does put alot of stress on the output shaft.
but,
my chains aren't ran to tight.

i lean towards the radius in the corners of the bottom of the circlip groove being machined wrong.

upon inspection the new one i bought from ape had a larger corner radius in the bottom of the cut.



leon

thanks for the info.