I am rebuilding my lower end on my zilla and was wondering what would be best to use to clean the cases (from all the oil and gasket junk). I was afraid that if I used the wrong stuff I would ruin the seals if I used the wrong stuff. Any ideas?

 

arent you replaceing the seals? i would be.
anyway my suggestion would be a good quality brake cleaner. removes all grease and oil, plus leaves no residue.
good luck
aaron
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If your splitting the cases, get some gasket remover from napa or somewhere. It works great to remove the yamabond. You don't have to scrape and reck the surfaces.