Thanks for the info I will look at the links. Some more information It is a second hand Howard 350 series rotary hoe powered by a Kohler k 141 T 266 c.c 4 stroke single cylinder air cooled petrol engine developing 5.3 b.h.p. At 3,600 rpm governed speed; fitted with Automatic Compression Release 27/8 in bore x 2/12 stroke. It was made somwhere in the early 70's. It was purchased second hand for $900 in 1980 from Squires sales and service Summertown who have been taken over by Kubpower . Its serial number is 310A/1355
I have a manual for it, here are some photos

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