Claim
6.
A four-stroke internal combustion engine according
to claim 3, in which the gear [20] supported by the sleeve [28]
has respectively an even or uneven number of teeth when the number
of teeth of the splines between the drive shaft [17] and the sliding
tube [32] and the number of teeth of the splines at the abuting
ends of the drive shaft [17] and of the shaft [18] of the second
crankshaft [5] are respectively uneven or even.
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