#11 PostAuthor: Crofty » Fri Feb 26, 2010 10:33 am
I can only speak for my Z650, which has 2 each side. If Kawasaki designed it to have 2 in, I would definately put 2 back in. You are far better having the forces spread between 4 than 2, they would wear out too quickly. I have just had a quick look online at a parts catalogue and the 1979 KZ1000 have 2 each side, you did not say what bike you are fitting them to.
Another thing I did was to heat the swingarm in wify's oven about 100 for 10 mins(don't get it too hot, just warm) and I had the bearings in the freezer for a couple of hours and greased the outside of the bearings lightly.