Since my engine is already apart, a flush is out of the question. Are there any safe products for cleaning out the water ports in a Nikasil cylinder and head? The ports have a film of what looks like lime or calcium deposits, and they are not thick. I just want to clean them out.
I do not use tap water, I usually just use Maxima Coolanol or in an emergency I'll use a 50/50 mixture of auto radiator fluid and distilled water. The bike is a 1991 model so there must just be buildup that happened over time.