Looking for a Dell'Orto carburettor with a 21 mm bore for your 50 cc two-stroke? The PHBG 21 DS has the connection for the mixer oil, fixes to the manifold with a flexible fitting and is operated by a manual cable choke: a practical way to replace the original carburettor or to get the mixture right again after a modification.

Specifications

• Model PHBG 21 DS, 21 mm bore
• Connection for the oil mixer
• Cylindrical throttle slide
• Flexible manifold fitting
• Manual cable choke, cable not included
• Separate starting circuit
• Idle adjustable with jet and mixture or air screw
• Main circuit with tapered needle
• For 2T and some 4T engines

Where it fits

Some of the 50 cc scooters and motorcycles it is used on:

• Derbi Senda / GPR 50 / GP1 50 / DRD Pro
• Aprilia RS 50 / Rally / Sonic / SR 50 / Tuono 50 / Area 51
• Beta Ark / RR 50
• Gilera DNA 50 / Runner SP / Stalker / Typhoon
• Malaguti F10 / F12 / F15 Firefox / Centro 50
• MBK Booster / Nitro / Stunt / Ovetto / Mach G
• Piaggio Zip / Liberty / NRG / Beverly 50
• Yamaha Aerox / BW's / Neo's / TZR 50

Fitting tips

• Check that bore, manifold fitting and oil feed match the carburettor being replaced
• Connect the choke cable (bought separately) and check its travel
• After fitting, set the idle with the screw and check the mixture at mid and top revs
• If you have changed the exhaust or air filter the jets may need tuning

Before you buy

The PHBG 21 DS suits two-stroke engines with an oil mixer and, in some cases, four-strokes. If you are unsure about your model, compare the measurements with the fitted carburettor.

Frequently asked questions

What bore does it have?

21 mm.

Is the choke cable included?

No, it must be bought separately.

Does it have the mixer connection?

Yes.

Does it suit a 50 cc two-stroke?

Yes, that is its typical use.