Dell'Orto PHBN 17.5 LS carburettor with manual choke for Piaggio and Minarelli 50 cc 2T engines

The Dell'Orto PHBN 17.5 LS carburettor is the replacement for 50 cc two-stroke scooters with a Piaggio or Minarelli engine that use the manual cable choke: 17.5 mm bore, cylindrical throttle slide and an independent starting circuit.

It is the right part when the original carburettor is worn or dirty and the scooter starts badly from cold, idles unevenly or hesitates when accelerating, and it also suits a scooter fitted with a different exhaust and air filter.

Technical features

• Dell'Orto PHBN 17.5 LS
• 17.5 mm bore
• For 2-stroke engines
• Cylindrical throttle slide
• Manual cable choke with independent starting circuit
• Idle system with jet and air adjusting screw
• Main system with tapered needle and mechanical mixture adjustment
• 24 mm manifold connection with flexible mounting, 35 mm air intake

Which scooters it fits

It suits 50 cc two-stroke scooters with a Minarelli or Piaggio engine, including:

• Yamaha: Aerox, BW's, Neo's, TZR 50
• MBK: Booster, Nitro, Stunt, Ovetto, Mach G
• Aprilia: SR 50, Sonic, Rally, RS 50, MX 50, Area 51, Scarabeo 50, Tuono 50
• Gilera: DNA 50, Runner SP, Stalker, Typhoon
• Beta: Ark, RR 50
• Piaggio: Zip, Liberty, NRG, Vespa ET2, Beverly 50

When to replace the carburettor

Replace or overhaul the carburettor when the scooter is hard to start from cold, idles unevenly, uses too much fuel or loses power and cleaning the jets does not help. After fitting it, check the fuel mixture and jets, especially if the exhaust and filter have also been changed.

Before you buy

Check that your engine is a 50 cc two-stroke Piaggio or Minarelli with a manual cable choke, then compare the bore, manifold connection and air intake with the fitted carburettor.

Frequently asked questions

Which model is it?

A Dell'Orto PHBN 17.5 LS with a 17.5 mm bore.

What kind of choke does it have?

A manual cable choke (LS version).

Which engines does it fit?

50 cc two-stroke Piaggio and Minarelli engines.

What are the connection sizes?

24 mm manifold connection and 35 mm air intake.