I need to see the top cover 358#. Will either be 2.8 46cc , 3.0 49cc, 3.3 54cc all bare bores. 2800 3.0 3300.
So if wrong top cover by chance you need to measure.
Not a 3000 in 49cc in grey, but sort of like it in same cc. 3000 was chrome bore thin rings. 3.0 is bare bore thick rings.