A chainsaw just drove by my house. Update: came back again. It's an off-road bike...
I have a a few of those sounds to contend with where I live. I get to hear military copters, the revved up Harley's, off road 'chainsaw' sounding bikes, modified cars, trash trucks, construction cranes that go beep beep all day long, loud music emanating from the modified cars, car alarms, military live ammo training, pedestrians headed to the beach and the occasional military jet overhead. I sit about 5 feet away from my TV and there are days/nights when I cannot hear it. Life is very busy where I live.
Was it going through the gears? That's even more fun to listen to!
Not
Kinda. Sounded like they sawed for a bit then stopped.