I have a woodchuck chuck and duck I am using. The knives are 14 inch. Even with earplugs it has a sickeningly loud drone. I am wondering if I should put a tach on the engine to see if it is going to fast? I have never heard another one so I am not sure. After I shut off the engine and disengage the clutch there is what I think is a dry bearing noise. I took off all the covers and can find no grease zerks for the main bearings. Should I drill it and put one in? Thanks