Where is the serial number located on a Yamaha grizzly 660?

The serial number for a Yamaha Grizzly 660 is typically located on the frame, near the rear of the ATV. Specifically, you can find it on the left side of the frame, just below the seat or around the rear axle area. It may also be found on a label attached to the frame. Checking your owner’s manual can provide more precise guidance on its location.