lam1962brettagg wrote:just about to fit a koyo drive side r2s. took one seal off to find it is plastic/nylon caged??
just wondered what the general concensus is about this. all other main bearings i've fitted have been metal caged.
standard s3 li150 casa new crank.
also, c3 or cm rating if a nylon caged is ok to fit?
cheers in advance.
A good European or Japanese bearing with 'rolling elements' that utilises cages moulded from mon-metallic cages can be used within the crankshaft support journals without issue. I have fitted many of them, generally on the magneto side, without issue. In fact, the rating of such bearings is often
greater because they allow more 'crowding' of the bearing . That is, more balls or rollers can be designed in.
Kart engines that are loaded & rev significantly higher than Lambrettas utilise phenolic resin cages in preference to metallic cages.
The issue with moulded cages is where safety is an important factor.
I have removed newly fitted rear hub bearings with black, soft nylon cages from the layshaft because
they fail, despite the manufacturer having the word "INNOCENTI" etched on to them. I am unsure of the copy rights in claiming such remanufactured products are "INNOCENTI" but I suppose one blessing will be that the actual manufacturer is well known to many of us by another name, & the inevitable investigation when one of those causes a serious accident makes it much more difficult for them to deny liability.
Posted: Fri Apr 26, 2019 2:21 pm
I wouldn’t fit it if it was mine, only seen and used metal cage 