As shown in FIGS 1A and 3, the front bearing {TAIL ~ support plate} 10A includes a hollow cylindrical portion 10a which receives a rear end portion of the change shaft 5 such that annular fluid chambers 14a and 15a communicating with {HEAD ~ clutch operating fluid passages} 14 and 15 in the shaft 5 are defined in the hollow cylindrical portion 10a 
As shown in FIGS 1A and 3 , the front bearing { TAIL ~ support plate } 10A includes a hollow cylindrical portion 10a which receives a rear end portion of the change shaft 5 such that annular fluid chambers 14a and 15a communicating with { HEAD ~ clutch operating fluid passages } 14 and 15 in the shaft 5 are defined in the hollow cylindrical portion 10a
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