2020 Sidewinder ltx dumping oil in air box

[Brod71]

My dad has a 2020 yamaha sidewinder ltx se and at the end of last season it dumped a significant amount of oil into the air box through the large tube behind air filter . I took it to the dealership and they said it was probably a plug vent line as they couldn't find any problems. I just had it out today and it did the exact same thing, dumped probably 250+ml of oil into air box all over clutch and belt. There is very little snow here so all the vent line are clear. Anyone have suggestions about what the problem could be? Thanks

 

[Phatboyc]

Start here and see if it helps.

https://ty4stroke.com/threads/getting-rid-of-the-roll-over-valve.151185/