Hi 007 Jenno,

This Scott Bonnar 45 Looks to have had a replacement motor fitted .The original motor was the similar Kirby / Tecumseh motor.

History link below

https://www.outdoorking-forum.com.a...4933/MODEL_45_-_History_Record_-_c1.html

On the Tecumseh motor it has a label that lists D.O.M = Date of manufacture ,the first number here is the year but doesn't list the decade,
so looks about 1985 or 1995 , then the 226 is the 226th day = around August 14


Scott bonnar 45 machines went into production in 1968 and followed through to 1980 where it was purchased by Rover and was completely lost to rover by 1983

The H30 on the engine ID is Horizontal shaft 3 Hp and also has the 3 Hp sticker on the starter .

Tecumseh introduced its line of black four-stroke engines in the mid-1980s. The black engines were designed to provide a more modern aesthetic and improve performance and durability. This development was part of an overall trend in the industry towards four-stroke engines, which were becoming increasingly popular due to their efficiency and lower emissions compared to two-stroke engines.

Operators motor manual http://www.tecumsehpower.com/CustomerService/OperatorManuals/pdf/181-789-14.pdf

Cheers
Max.