Replace your Puch E50 bearings all at once. This is the the snapring bearing, and normal bearing all in one kit.
Set of two 6203 bearings. These are for the mainshaft gear. Or the primary gear. Or that big gear in the back of the engine. Whatever you want to call it. Some people don't bother replacing these since there is less wear on them in the engine but I figure if i'm going to make the effort of opening the engine you might as well replace them. You know for fun.
[Mechanincs Super Secret Corner]
A little known fact is that these two bearings will also work as crankshaft bearings in a Garelli NOI motor and will also work in a Batavus Laura M48 motor. Now you know and knowing is half the battle.
A high quality bearing manufacturer, will be NTN, SKF, FAG, NACHI, or BING bearings. All the same high quality bearings we use in our own engines.
1 x Bearing 6203
1 x Bearing 6203 Snapring Style