I was thinking about dirty carbs as well. I did not use any stabilizer in the fall. I was running the bike occasionally but when we got dumped by snow I was too busy shoveling snow and health problems compounding the situation the bike sat for months. I thought I mostly drained the tank but obviously not enough. I am going to try so carb cleaner in the tank next then take out the carbs and muck out if that’s what I have to do.