said casing apparatus housing V belt means including a rear pulley on said input shaft, a forward pulley on an output shaft of said engine and {HEAD ~ a V belt} operatively connecting said pulleys, each of said pulleys having a circumferential periphery wherein said reduction gear means are positioned closer to said {TAIL ~ rear wheel} than said V belt means, and a centrifugal clutch is provided on an outer end of said input shaft furthermost from said rear wheel via said reduction gear means and said V belt means 
said casing apparatus housing V belt means including a rear pulley on said input shaft , a forward pulley on an output shaft of said engine and { HEAD ~ a V belt } operatively connecting said pulleys , each of said pulleys having a circumferential periphery wherein said reduction gear means are positioned closer to said { TAIL ~ rear wheel } than said V belt means , and a centrifugal clutch is provided on an outer end of said input shaft furthermost from said rear wheel via said reduction gear means and said V belt means
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