upside down warrior runs bad

[USMC 350]

Went riding this weekend and the wife tipped over on the Warrior. The Warrior was upside down for just under a minute but now it labors to start. While running the thing pops and stumbles under load. Definitely not running right. The warrior has an oil cooler with clutch cover mod, Z400 CV carb, open airbox with filter adapter and the crank case vent has a breather on it which is routed into the airbox next to the air filter. I have tried to search for answers but I don't think I'm using the right words in the search. I am a 2 stroke dirt bike guy so I want to know if anyone can give me some tips before I start tearing into this thing. All help will be appreciated.:tup:

 

[YAMAHAULER]

there is probably a lot of oil up in the cylinder pull the plug turn it over to blow any oil out then instal a new plug and run might want to pull the carb too just to make sure no oil got into it start with those things and see