Yes. They're upper con-rod bearings, as in "connecting rod". They'd be located at the upper end of the connecting rod where the wrist pin passes through it and the piston. Watch for snap rings holding in the wrist pin.
If you remove the piston from the cylinder, you may need a ring compressor to get it (and its rings) back in. I don't know if the rings are pinned on the Grubee's 66 cc, but it might be safe to assume they are.
When you tear her down, make sure that's your problem. Even a good fix is no fix at all if you still have the problem when you're done.