Malossi Item number: M1620090
Malossi
Type: Carburetor kit with 2-hole rotary valve intake
Carburetor: Dellorto PHBL 25 mm
Suitable for: Vespa V50, PV, ET3
Application: powerful smallframe street and touring engines
Advantage: compact, easy to tune, wealth of experience
Note: Ideally, adapt the engine housing to the intake cross-section
269,00 €*
not available
Shipping weight 0,88 kg

Carburetor kit MALOSSI 2-hole, 25 mm Dellorto PHBL, rotary valve for Vespa V50, PV and ET3

Carburetor kit for Vespa Smallframe with rotary valve intake, suitable for V50, PV and ET3.

The MALOSSI carburetor kit with 2-hole rotary slide intake and 25 mm Dellorto PHBL is a very harmonious solution for powerful smallframe engines. It is not without reason that the 25 mm PHBL has been one of the most popular carburetors in this sector for years: compact, easily accessible, cleanly tunable and large enough for many powerful street and touring setups.

MALOSSI Rotary slide 2-hole PHBL 25 mm Smallframe

Why 25 mm fits so well for many smallframe engines

sensible cross-section: large enough for powerful street engines without becoming unnecessarily sluggish
very easy to tune: the PHBL has a lot of experience, many setups and a good supply of parts
compact design: easier to accommodate than much larger carburetors
Suitable for everyday use: good mix of performance, drivability and economy

For which engines a 25 PHBL works particularly well

In many cases, a 133 cc cylinder with a rated speed of around 7000 rpm is already very well supplied with a 25 mm carburetor. This is precisely where the PHBL comes into its own: good pulling power, clean tuning and sufficient reserves for powerful smallframe engines that need to work quickly and reliably on the road.

Bigger is not always better

Whether a larger carburetor really makes sense is not only determined by the displacement, but above all by the engine speed at which the engine should deliver its full power. A larger carburetor often does not increase performance on moderately revving 133cc concepts, but often worsens tunability and consumption.

133cc street engines: 25 mm usually just right
Higher revving concepts: larger carburetors can be useful
25 mm PHBL: still often remains the universal wild card

When larger carburetors make sense at all

Larger carburetor diameters only show their advantages when the engine really develops its power at higher engine speeds. Typical examples of this are concepts such as Malossi 136, Quattrini M1B or VMC ET6 / ET7 with matching exhaust and corresponding overall concept. Even there, however, the 25 mm PHBL often remains a very good choice because it is compact and can be used surprisingly widely in practice.

Important during installation

In order to utilize the full potential of the engine, the engine housing should always be adapted to the carburetor cross-section at the intake tract, as far as this is structurally possible.

Adjust the intake cross-section properly
Do not leave any unnecessary stages in the intake
Pay attention to the overall concept of cylinder, speed range and exhaust

Practical benefits

If you want to build a powerful smallframe engine on a rotary valve basis, the 25cc PHBL is an intake system that can do a lot without being unnecessarily bulky or difficult to tune. This is precisely why this combination has been so popular for years.

Conclusion

The MALOSSI carburetor kit with 25 mm Dellorto PHBL is a very well-rounded solution for smallframe engines with rotary valve intake. It offers enough cross-section for powerful setups, remains easy to ride and is therefore the more sensible choice for many engines than an even larger carburetor.


OEM numbers (for comparison purposes only)
Scooter Center:
M1610746
Malossi:
1610746, M1610746
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