Hi Ty

These covers where common as anything on mowers in the 1970's and 1980's infact they only had the covers removed once the body design of masport mowers changed around the late 80's. I have several mowers here at my place with those plastic covers on them.

Also here in NZ at least the throttle control remained on the engine into the early 1990's on some models. Below is some pictures of one of these 3.5hp motors with the stickers showing throttle operation and one of the earlier covers used by Masport - they were made from steel not plastic and painted to look similar to the engine (sorry about quality)

Cheers

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"You can't beat a good old Victa 2 stroke"