On 22 Apr, 18:55, andrew wrote:

Yes but not if the crankcase seals are blown.

This is a Ryobi. They have a habit of the screw fasteneres working
loose and so rather than a "seal" having failed, there's just a gap
opening up between cylinder and crankcase.

Strip and re-assemble with Loctite. Needs an odd-sized Torx #27, but
easy.