Description

Carburetor gasket set BGM ORIGINAL for all Dell'Orto SI20/15, SI20/17, SI20/20, SI24/24, SI26/26

Gasket set for the classic SI carburetor series from Dell'orto. These were used on all Vespa engines of the Largeframe series. The term Largeframe includes all Vespa manufactured from about 1957 (with the appearance of the Vespa VNB models) with rotary slide intake (a crankshaft web controls the mixture inlet into the crankcase). This includes all VBA, VBB, VNB, VBC (Super) , GT, GTR, GL, TS, Sprint, Rally and the PX model series.

The gasket set is available as

• BGM1212CA1 small set (without float needle)

• BGM1212CA2 large set (with float needle)

The gasket set includes all rubber and fiber gaskets, but not the paper gasket for the float chamber. This can almost always be reused if in good condition.
In addition, it is often included in the engine gasket sets so that many screwdrivers have these seals in abundance in their assortment.

SPRING-LOADED OR UNSPRUNG?
A sprung float needle is the modern successor of the unsprung version and can replace it 1:1. The spring serves to protect the rubber tip against too much pressure and buffers too strong impacts of the float, e.g. with bumps, like a shock absorber. On many, supposedly non-adjustable engines, the mere installation of a spring-loaded float needle helps to tune it well. The additional buffer makes the float level much more stable, independent of the engine's own vibrations.

TRIANGULAR OR SQUARE?
Dell'orto uses as a rough distinction two different shapes of float needle types; triangular and square. The square type is available in two different sizes: 4.5mm and 5.2mm

• Triangular: Dell'Orto SHB, PHVA, PHBN, PHBG, FHBB, UB, MA18, MB A 20-24

• Square 4.5mm: Dell'Orto SI20, SI24/24E, SI26/26, SH, PHBH, PHBL, VHB, MA BS5/BS7, MB B20-24

• Square 5.2mm: Dell'Orto SI24/24H, SI26/26H, VHSA,VHSB

TIP: For a perfect result, the float needle seat in the carburettor should be cleaned if necessary. To do this, insert a cotton swab into the hole in the float needle and turn it back and forth with gentle pressure. To clean the whole carburettor, you can use brake cleaner.

KNOWLEDGE: The most common reason for a defective float needle is wear/ageing of the sealing rubber tip. For this reason, the BGM PRO float needle is made of durable Viton®.

 Dell'orto SI D-E-G

 Vespa (Motovespa) Vespa 200 DS (engine 9DS)

 Vespa (Motovespa) PX 200 Iris (engine 73M)

 Vespa (Motovespa) PX 150 Iris (engine 75M)

 Vespa (Motovespa) PX 200 Iris (engine 76M)

 Vespa (Motovespa) PX 200 Iris (engine 77M)

 Vespa (Motovespa) PX 125 T5 Sport Elestart (engine 108M)

 Vespa (Motovespa) PX 125 T5 Sport (engine 98M)

 Vespa (Motovespa) TX 200

 Vespa (Piaggio) Vespa 150 Super (A, VBC)

 Vespa (Piaggio) Vespa 150 Sprint (VLB1T)

 Vespa (Piaggio) Vespa 125 Super (VNC1T)

 Vespa (Piaggio) Vespa 125 GTR (VNL2T)

 Vespa (Piaggio) Vespa 125 GT (VNL2T)

 Vespa (Piaggio) PX 125 T5 (VNX5T)

 Vespa (Piaggio) Vespa 150 (VBA1T)

 Vespa (Piaggio) Vespa 150 (VBB2T)

 Vespa (Piaggio) Vespa 150 Super (VBC1T)

 Vespa (Piaggio) Vespa 150 (VGLA)

 Vespa (Piaggio) Vespa 150 (VGLB)

 Vespa (Piaggio) Vespa 150 GL (VLA1T)

 Vespa (Piaggio) Vespa 150 Sprint Veloce (VLB1T)

 Vespa (Piaggio) Vespa 180 Rally (VSD1T)

 Vespa (Piaggio) Vespa 200 Rally (VSE1T, Femsa)

 Vespa (Piaggio) P 125 X (VNX1T, -1983)

 Vespa (Piaggio) PX 125 E (VNX2T, 1981-1983)

 Vespa (Piaggio) PX 125 E FL (ZAPM09300, 1998-2000)

 Vespa (Piaggio) PX 125 E FL (ZAPM09302, 2001-)

 Vespa (Piaggio) PX 150 E FL (ZAPM09400, 1998-2000)

 Vespa (Piaggio) P 200 E (VSX1T, -1980)

 Vespa (Piaggio) PX 200 E (VSX1T, 1981-1983)

 Vespa (Piaggio) PX 200 E FL (VSX1T, 1984-1997)

 Vespa (Piaggio) PX 200 E FL (ZAPM18, 1998-)

 Vespa (Piaggio) P 80 X (V8X1T, -1983)

 Vespa (Piaggio) PX 80 E FL (V8X1T, 1983-)

 Vespa (Piaggio) PX 80 E FL Elestart (V8X1T, 1984-1990)

 Dell'orto MA 18-19 BS5

 Dell'orto MA 18-19 BS7

 Dell'orto MB 21-23 BS5

 Dell'orto MB 21-23 BS7

 Dell'orto SH1 18-20

 Dell'orto SI 20/15-20/17 D

 Dell'orto SI 20/15-20/17 (A)

 Dell'orto SI 20/15-20/17 B

 Dell'orto SI 20/15-20/17 C

 Dell'orto SI 24/24 E

 Dell'orto SI 27/23