I thought I had to split the chain also. The new one went out very tight, almost no freeplay in it.
What do you mean with kickleg?
Bearings can be bought at your local bearing dealer as it is a standard size. Just as long as you have a good brand and c3 type, it should be ok. There are some different opinions on whether they should be open or sealed. I have the open types.
I don't know why they brake, maybe the retainer was of poor quality and split. I am on the 50-60 hours now and wonder if it might happen again or just a bad bearing quality.
Regards.