There is a big oil leak on my '03. The circle of oil that has leaked out is about 6 inches in diamter. It is leaking on the left side of the motor at the bottom. It is kinda weird, because there is oil all around the front sprocket and on the chain. But the most oil is around where the shifter goes into the motor. There is oil from 1 inch in front of the front sprocket to the very back of the motor. There is also oil just below the clutch cable. Is this just a o-ring around the shifter gone bad is or is it worse? Am I looking at a major repair?