said case main body being integrally provided at {HEAD ~ the front casing section} thereof with {TAIL ~ an engine casing} to form a power unit with said transmission cover member and said V belt cover, the power unit being swingably mounted on the vehicle body; and 
with
said case main body being integrally provided at { HEAD ~ the front casing section } thereof with { TAIL ~ an engine casing } to form a power unit with said transmission cover member and said V belt cover , the power unit being swingably mounted on the vehicle body ; and
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