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The Stage6 PHBG DS 21mm is a Dell'Orto PHBG carburetor selected and set up by Stage6 for 50cc two-stroke scooters, 50cc motorcycles, mopeds and vintage Vespas. It uses a flexible (spigot) mount, a manual choke that can run as a cable choke or a pull-knob choke, and ships with a 92 main jet and a 50 idle jet. It is a tuning part: it suits riders who have done other engine work and need more airflow than the stock carburetor gives, and it is not a bolt-on for a stock engine. Against a stock 12–17.5mm carburetor it flows more mixture and supports bigger cylinders and exhausts, but it needs jetting work to run right.
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This is a 21 mm Dell'Orto PHBG DS carburetor, optimized by Stage6. It is a universal carburetor for 50cc scooters, 50cc motorcycles, mopeds, vintage Vespas and other vehicles with a 2-stroke engine.
It has a manual choke. You can fit either a cable-operated manual choke or a pull-type manual choke in its place. It has an oil inlet and a flexible mounting. It has no vacuum connection and no fuel heater.
It can replace the original carburetor on a tuned engine. A box of extra jets (5 mm thread) can be used to adapt the settings to the engine. The spark plug color shows whether the carburetor is tuned correctly.