I have an oil leak and I'm almost positive it's coming from the " seal and o-ring" behind the front sprocket. I took the front sprocket and the cover plate behind the sprocket off and I can see the seal. How hard is it to replace that seal and o-ring? It leaks oil every time I drive it. It doesn't leak a drop when the quad has been cleaned dried and sitting. Any suggestions or help on how to would be nice. I would probably be doing this work before/during the weekend.