Just posting some pics of when I replaced the oil strainer screen on my CBR 125R. This maintenance is suggested every 12,000km / 7,500 miles. The Little thumpling has no oil filter, just this screen; it's "self cleaning" when the engine is shutdown the oil drains back down through it. Removing the old clutch cover gasket material was a PITA...
Clutch cover:
Clutch-side of the crankcase:
Oil screen location close-up, oil drain bolt below it:
Old oil screen with a bit of debris:
Clutch cover:
Clutch-side of the crankcase:
Oil screen location close-up, oil drain bolt below it:
Old oil screen with a bit of debris: