logo and shroud are the easiest to spot that its late 70's- early 80's That decal started around 77-78 timeframe, and went up through the most of the 80's. That shroud started at the end of 1974 on the small H engines and ran through the mid 80's until they made them deeper due to coil fitment....they went totally flat on the face, no hump around the recoil.
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