Hello Sean

It's clear that the mower has not been stored very well,
but that is a small problem.

The starting place is to read the manual to get acquainted
with the terminology. Download is HERE.

The second thing I would like to see is:-
- The model should be the uncommon 450511.
Would it be possible to get a close-up of the plate?
- the engine model type code. Probably 80102 0233-01 xxxxxx
Could you confirm the full set of numbers please.

The third thing will be good photos of the chaincase
and underneath - to see the bottom blade.

Hope this helps.
---------------------------
Jack