I would take it apart and flush it out really well with denatured alcohol. If you see scratches on the liner and/or piston you will probably have to replace those. If you don't want to take the bearings out you could leave them in but be sure to clean them out really well. If do a search on the web I am sure you can find an article on taking the engine apart. It isn't really all that complicated. Before you put it all back together make sure to dry the alcohol out and oil everything up real good with some light oil. Maybe you will get lucky and not have any damage but you can't really tell till yo tear it apart.


edit: I see you beat me to it. Do you see any scratches on the liner?