Here is the must from MALOSSI for PIAGGIO mopeds Ciao, bravo, boss, grillo, si, superbravo ... named BIG DEPS 4 with a compression ratio of 13.95: 1. This high engine diameter Ø47mm is a real monster 70cc torquey and solid as we like them. It is the only cylinder available on the market for CIAO / SI having the barette exhaust and symmetrical transfers in number of 6 !!!

First of all the diagrams are beautifully well worked and open allowing you to use your PIAGGIO moped to its maximum. S is aluminum alloy and its treatment nykasil are very upscale. It has good diagrams and a high quality bi-segment piston to promote torque.

For reinforced crankshaft with Ø12mm axis. The cylinder head has a tapered central combustion chamber which will offer you a much better combustion and therefore necessarily a gain in power and engine efficiency. MALOSSI has been able to combine performance and reliability with this cylinder.

Now let's see the technical characteristics of this cylinder .

Dual exhaust.
Symmetrical transfers.
Cylinder head with central and empherical combustion.
Decompressor valve with reduced dimensions.
Distribution: 6 transfers.
Cylinders obtained by gravity fusion in special steel shells.
Materials: primary aluminum alloy with a high content of enhanced and stabilized silica.
Machining: on very high precision numerical control machine tools.
Cylinder with addition of silica carbides in a galvanic nickel matrix and crossed polishing with passage of diamonds with very close tolerances.
Recalculated heat exchange surfaces.
Evacuation and intake ducts designed and tested with the aim of obtaining maximum thermodynamic efficiency.
High mechanical strength spheroidal cast iron segments with additions on the contact surface of hard chrome anti-wear ground and lapped.
Dimensional checks of shape and roughness.
Cylinder piston coupling selection of 0.010-0.005 mm.
100% hydraulic seal check.

the pack contains:

-an aluminum cylinder d.47mm

-a bi-segment piston d.47mm

-a reinforced axis with anti-wear treatment, original diameter (12mm)

-2 piston clips (pin ring) type C

-2 thin segments reinforced convex hard chrome

-pack reinforced seal

-4 reinforced studs

- exhaust connection

-valve decompressor (smaller than the origin)

-autocollants Malossi

Available in Ø12mm piston pin.

Mounts on :

PIAGGIO BRAVO 50
PIAGGIO BOSS 50
PIAGGIO GRILLO 50
PIAGGIO SI 50
PIAGGIO SUPERBRAVO 50
PIAGGIO CBA 50

and other models.

As an option we offer a stage 1 preparation, this preparation is a modification of the exhaust port by increasing the diagrams and improving the duct, it increases the performance of the cylinder. An improvement to the bottom of the skirt is also included in this modification. Allow a little extra time for this preparation!

Rear wheel bearing with reinforced support machined SWING mass for PIAGGIO CIAO