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- Vespa Classic
- Carburetor -DELLORTO 19mm PHDG- AU mixing tube without holes - DEL9853
The PHDG is Dell'orto's latest generation of racing carburetors and was developed with modern two-stroke and four-stroke high-performance engines in mind. The 19 mm variant is the all-round size of the series and is suitable for sporty street configurations and high-torque engines where responsiveness and clean mixture preparation are the focus.
Racing carburetor Venturi 19 mm Plug-in connection in rubber flange Separate lubrication and vacuum connection
The round venturi of the PHDG is located on an axis with inlet and outlet and is designed to optimize flow. The aim is to achieve a high air flow rate with the smoothest possible flow. The result is spontaneous throttle response and an easily controllable power build-up over the entire usable speed range.
The air intake profile at the carburetor mouth is matched to the slide geometry. When the throttle slide is opened, the response is very direct without being hectic or difficult to control - ideal for sporty road and trackday setups.
The carburetor housing, float chamber and throttle slide are made of an aluminum alloy. This reduces weight and improves heat dissipation compared to classic die-cast zinc bodies. As a result, the mixture preparation remains stable even at high continuous temperatures.
The float needle valve is designed as a replaceable unit and is available in several sizes. This allows the fuel flow to be adapted to the respective setup and the type of supply (gravity or fuel pump). The idle mixture screw works with a large, finely adjustable setting range, which ensures smooth idling as well as a very direct response when starting off.
The aluminum throttle slide has a wear-reducing surface treatment and runs smoothly in its guide. The carburettor cover and the screw plug of the float chamber are also surface-finished - this ensures a harmonious racing finish with high mechanical resilience.
| Carburetor type | Dell'orto PHDG |
|---|---|
| Mode of operation | 2-stroke |
| Ø Venturi | 19 mm |
| Ø connection width | 25 mm |
| Connection type | Push-in connection (elastic) |
| Air filter connection | 46 mm |
| Main nozzle | 108 |
| Idle jet | 55 |
| Starter jet | 60 |
| Nozzle needle | W 07 |
| Mixing tube/atomizer | AU 262 |
| Nozzle needle holder | 2.0 mm |
| Float needle valve | 170 |
| Float | 4,0 g |
| Throttle slide | 40 |
| 2T mixer connection | available |
| Vacuum connection | available |
| Choke | Direct actuation (lever, pull knob ...), cable holder can be retrofitted |
| Adjustment screws | Left |
| Accelerator pump | No |
| Brand name | Dell'orto |
Note: Nozzle configuration depends on version and production batch. Check idling and choke function before starting for the first time.
Many Dell'orto tuning parts from the PHBG family can also be used in the PHDG with the same part number. These include 5 mm main and idle jets, AN/AU mixing tubes, W-series jet needles and the 4.0 g floats. It is important that the Dell'orto part number is identical - then technically speaking it is the same component. Mechanical components such as the throttle valve, on the other hand, are PHDG-specific and should not be taken from the PHBG.
Depending on the version, PHDG standard carburetors are available with a closed AU mixing tube (without holes) or with a drilled AN mixing tube. In practice, it has become common practice to refer to AU variants as "two-stroke mixing tubes" and AN variants as "four-stroke mixing tubes". Technically, these are abbreviations for different flow and mixture characteristics, not a rigid assignment to an engine type.
Which mixing pipe variant is better suited to your own engine depends on the cubic capacity, exhaust system and intended use. The spark plug pattern, driveability in the partial load range and transition to full load are the decisive criteria here, not just the designation on the data sheet.
Dell'orto PHDG 19 mm carburetor in the above-mentioned configuration (Dell'orto 09853). Depending on the version, with corresponding basic jetting and the specified calibration elements according to the manufacturer's specifications.
The Dell'orto PHDG 19 mm is a versatile racing carburetor for sporty two-stroke setups. Optimized flow control, aluminium construction, plug-in installation in the rubber flange and a finely tunable idle system make it a strong basis if responsiveness and clean mixture formation are the main focus.
