Morini 3 1/2 Sport
The Morini 3 1/2 Sport is the most famous of the Morini V twins. It was based on the
Franco Lambertini designed Strada, with which it shares most of the engine parts
and running gear. It was first
released in 1974, one year after the first Strada.
One of the more interesting aspects of the design is the use of the 'Heron' head.
This type of cylinder head uses a flat cylinder head with the combustion chamber
machined into the top of the piston. The cam shaft is mounted in the 'V' of the two
cylinders and its location results in short pushrods resulting in lowered mass of the
valve train. A toothed rubber drive belt is used to drive the camshaft from the
crankshaft eliminating the need for lubrication of a cam chain or the expense of cam
The original model had an 8 inch single leading shoe drum front brake, but from 1976
onward the front stopper was a single 260 mm disc. In all cases the rear brake was
180mm drum. (160mm drum on Strada)
One of the major flaws in the design (common to all morini V twins) is the lack
of a real oil filter. There are however several modifications available
to retrofit an oil filter.
A question - why do no two Morini 3 1/2s of the same age have the same type of exhaust shield ?
This is one of the great mysteries of our time.
- Weight - 156 Kg
- Displacement - 344cc
- Compression Ratio - 11:1
- Transmission - 6 speeds, dry clutch,chain drive
- Max Speed - 175 Kph(?)
- Power - 39 BHP @ 8500 RPM (?)
- Brakes(Early) - Twin Single leading shoe drum
- Brakes(Last) - Single 260mm disc
- Tank - 14 litres
- Forks - Marzocchi
- Colour - Red and Black (Hmm were there any other colours?)
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