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steel and phenol resin disks. It turns in an oil bath and
is mounted on the primary shaft on the gear box.
The clutch housing, made of special wear resisting cast
iron turns on two inner bearings which are set at an ade-
quate distance. It is lubricated together with the engine
sprocket as already explained in the paragraph of the
centrifugal filter. ,
This system ensures smooth movement, solidity and long
wearing; it has been fitted and tested on the 200 cc.
motorcycles, since 1960.
The clutch is operated by a handlever placed on the left
hand side of the handlebar.
the transmission between the engine and the primary
shaft of the gearbox is obtained by means of gears and
the reduction ratio is:
2.500 to 1.
The gearbox is mounted in the crankcase; the gears for
thq 5 speed gearbox are constantly meshed and are ope-
ra fed by a foot pedaL.
The transmission ratios of the gears are the following:
- in bottom gear 1 to 2.53
- in second gear 1 to 1.73
- in third gear 1 to 1.35
- in fourth gear 1 to 1.10
- in top gear 1 to 0.97
The transmission between the gearbox and the rear wheel
is made by means of a chain and the speed ratio is:
/..647 to 1 for the 250 GT and Monza.
2.222 to 1 for the 250 MACH 1 and Mark III,
3.929 to 1 for the 250 SCRAMBLER
FRAME
The frame of the DUCATI motorcycles is of a very smart
and modern design, is manufactured with high tensile
steel and is of the central girder type.
SUSPENSION
The front suspension is composed by the DUCA TI te-
lescopic - hydraulic long-stroke fork, with steering rod.
Each fork leg contains 1 -; 110 cu. cm. (cu. inch 6.1025
to 6.7127) of HYDRAULIC FLUID 542 oiL.
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34
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