I've got a little 77' Honda farm bike wheel and replacing wheel bearings. I found a set of NTN NOS bearings which have been sitting on a shelf for quite a while.
I spin them by hand and I don't feel much grease/resistance inside,even though I know they do have factory grease in them. I'm considering removing the hard-rubber seals and flushing them out and adding some fresh high quality grease,then reinstalling the seals.. I want to be sure not to damage the seals during the removal process which is a concern as I like 'sealed bearings for life'. The other concern I have is what's the best type of grease(quality synthetic?)to use for Long Life(if I do actually remove the seals to do this)to pack these bearings with and:how much is enough? I don't want to over-pack them and blow the seals out when they get hot,etc.
I've never removed the seals from a bearing to repack them before,just replaced them.
I imagine,the easiest way to do this,is just install them and not worry about it..