Installing a 900 crank into 1000

If I'm not mistaken, there are KZ1000 cranks with different size ends on them also. I believe the later KZ1000's are the ones with the larger ends but I would check first!

the j cranks have a 25 mm diameter and the z1's and kz's up to 1980 have 22mm diameter on the rotor end if your crank is a stock 79 crank it will be a mk11 crank .