Oil leakage of a motorcycle

Please, a 100cc motorcycle has a leak from the flywheel cover. The seal and flywheel gasket have been replaced, but the problem persists. It was thought to be the oil filter, but it's still leaking. What could it be? I'm out of ideas. It's not high-temperature silicone either; quite a lot has been applied. Thanks to anyone who might have an idea of ​​what it could be

Good, you raised the possibility of having the crankshaft bearings.