Vespa 150 GL Touring VGLA1T

Noggin · Post by **Noggin** » Sat 01 Nov 2008, 18:11

Hi, does anyone know the correct jet sizes for a 1959 150 Touring? It has the original SI 20/17 carburettor. Thanks.

henrikborjeson · Post by **henrikborjeson** » Sat 01 Nov 2008, 20:13

100 main jet, 185 in air corrector jet, 140 in air corrector jet cover, E1 mixer, Slow running jet 42

mvh/HB

Noggin · Post by **Noggin** » Sun 02 Nov 2008, 09:49

Many thanks.

Which is the starter jet?

henrikborjeson · Post by **henrikborjeson** » Sun 09 Nov 2008, 18:43

Noggin wrote:Many thanks. Which is the starter jet?

There is no starter jet on SI20/17 since this model has the choke viaa damper in the air filter alternatively in the inlet of the carburettor box.

It was not until 20/17C that a starter jet was fitted and to my knowledge this was for the later 150 sprint models

BR/HB

Noggin · Post by **Noggin** » Mon 10 Nov 2008, 10:37

Thanks H. Next question is; Can I bolt a new 20/20 straight in and if so would a PX carb box be suitable?

henrikborjeson · Post by **henrikborjeson** » Tue 11 Nov 2008, 00:01

Noggin wrote:Thanks H. Next question is; Can I bolt a new 20/20 straight in and if so would a PX carb box be suitable?

You can bolt a 20/20 on if you replace the box - a PX box without oil pump holes should be fine. However, the inlet of a VGLA engine is of similar area as the 20/17 so I wonder if you will get any noticable performance boost unless you increase the inlet and also fit a cylinder with a 3rd transfer port.

Br/HB

Noggin · Post by **Noggin** » Tue 11 Nov 2008, 13:08

Thanks Henrik, I wasn't really looking for performance. The old carb is in bad shape and it seems cheaper to buy a new carb, however I don't think Dellorto make the 20/17 any longer.

paa · Post by **paa** » Tue 11 Nov 2008, 13:41

There are also Spaco SI20/17 carburettors from India, manufactured under Dellorto license, on the market.

henrikborjeson · Post by **henrikborjeson** » Tue 11 Nov 2008, 20:26

Try putting an ad on the SSK marketplace. There are usually tons of 20/17 carbs out there left by those who have fitted new and more powerful engines. Unfortunately, I don't have any spare ones at the moment

BR/HB

Noggin · Post by **Noggin** » Tue 11 Nov 2008, 20:52

It's ok, I have bought a new 20/20 and managed to get a box for it. Thanks again.