I beleive that is a V196 1977-1980 160cc Utility Pro.
You should be able to find a serial number stamped on the crank case, if you can post it, I should be able to tell you more about the dates for this one.
That is a Series 70 MKIV (sometimes lables Series 80) engine, G4 Carburettor, and Serviceable Decompression valve (assuming all original)
Cheers Ty
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