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Main jet set -BGM PRO for Dellorto (type: 4576) SI- (90-112) - (90-92-95-98-100-102-105-108-110-112)

2599118
Main jet set -BGM PRO for Dellorto (type: 4576) SI- (90-112) - (90-92-95-98-100-102-105-108-110-112)
Main jet set -BGM PRO for Dellorto (type: 4576) SI- (90-112) - (90-92-95-98-100-102-105-108-110-112)

Description


The main jet of the SI carburettor determines how much petrol is made available to the so-called premix or pre-foaming. The higher the capacity and the higher the litre capacity, the greater the need for spraying. The available range is from 90-160. 102 main jet has a bore of 1.02mm, and thus provides less fuel than 104 main jet (1.04mm bore). That means the bigger the nozzle is numbered the richer the mixture becomes.


function nozzle block SI

The main nozzle should not be considered isolated, because it is only responsible to keep the fuel level in the nozzle block area on a sufficient level. Due to the vacuum at the atomizer tube the fuel is sucked in from the nozzle block. The fuel flowing into the nozzle block from below is limited to a maximum by the main nozzle. Air is also sucked in from above, whereby a fuel/air mixture is already formed inside the carburettor (mixing tube). This pre-mixture lets the mixture burn more effectively since it can be atomized more finely than pure gasoline.


If the HmainLairKcorrectionDnozzle is dimensioned the pre-mixture becomes too rich or too lean. If the HLKD is e.g. very large (190), the premix receives a high proportion of air whereby a disproportionately large main nozzle is required so that the engine runs properly even under full load. However, the result is often a mixture that is too rich under partial load and the scooter bucks. Nevertheless it can die off under full load in the upper speed range because the fuel level drops below the delivery height of the exhaust tube and the fuel supply is cut off. Often this phenomenon is tried to cure by mounting a so-called float chamber spacer. It is assumed that the float chamber will be sucked empty and therefore the engine dies off.


Normally a change of the air jet is more effective because the spacers increase the filling level in the carburettor, but they also provide a higher level in the nozzle block area, so that the premix can no longer work properly. Under certain circumstances gasoline can then also run (flood) from the atomizer directly into the engine. The real problem is therefore not a too small volume of the float chamber but a tuning of the HVACD.


A frequent problem which causes very large main nozzles is a modification of the air filter or the replacement by an intake funnel. In the original filter, a hole is often drilled into the filter bottom above the nozzles to allow a better flow to the HVAC. This measure usually improves the pre-foaming, but with heavily modified engines it can lead to a too low negative pressure in the nozzle block. As a result, the fuel level drops below the threshold of the atomizer/petrol outlet tube and the engine is only insufficiently supplied with mixture. Apart from a too lean full load operation, which usually no larger main nozzle can catch, it can come in extreme cases also to a complete stop of the gasoline delivery.


No more extreme is this problem when using air funnels. Here, with a used HVAC of 160, main nozzles are often used far beyond size 150. Here, too, problems often occur in the partial load range because the system of fuel delivery and premixing is out of balance. An adapted, smaller main air correction nozzle also helps to bring the main nozzle requirement back into an appropriate range.


TIP

The main nozzle for a new tuning of the engine is always as large as to throttle off under full throttle (four-stroke). Starting from this, reduce the main nozzle until the engine takes full throttle and turns off without jerking. A swallowing at throttle acceptance or a four-stroke in the partial load range is then carried out afterwards by an appropriate selection of the secondary nozzle, gas slide and possibly another mixing tube.

The HLKD (main air correction nozzle) is selected sufficiently small for most engines with 160.


(US)



Main nozzle set -BGM PRO Dellorto SI- (90-112) - (90-92-95-98-100-102-105-108-110-112)
AI-translation

 
€19.90 *

incl. VAT plus shipping costs

Available immediately (delivery time 1-3 working days*)
P For this item you get fidelity point/s
General
EAN: 4250366603865
Carburettor jets
used with carburettors brands: Dellorto
used as main jet in: Dellorto SI
diameter head: 5 mm
total length: 10 mm
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Available versions

Part no.: Jet size Price Stock Cart Save
Part no.: 2599118 Jet size 90-112 Price
€19.90
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Available immediately (delivery time 1-3 working days*)
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Part no.: 2599119 Jet size 115-138 Price
€19.90
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Part no.: 7673830 Jet size 140-162 Price
€18.90
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The main jet of the SI carburettor determines how much petrol is made available to the so-called...Continue reading

Fits the following vehicles


Ratings


7 Feb 2018

buen kit

17 Jan 2018


zum einstellen Tip Top

11 Jan 2018

Abstimmen der Gemischaufbereitung

26 Jul 2017

Düsen güt, Verpackung ist unglücklich, beim Öffnen fallen die Düsen raus

26 Jul 2017

Passt

26 Jul 2017

gute Auswahl um optimal einzustellen; passen

16 Oct 2016

Es wäre schön wenn die Düsen beim Öffnen des Behälters nicht alle herausfallen würden. BeideInnenteile verkleben und dann wirds besser. Eine Möglichkeit die Düsen zu beziffern wäre schön. Z.B. Papierstreifen einlegen.

14 Oct 2016

alles top - wie erwartet

31 May 2016

Qualität einwandfrei.

8 May 2016

sitzen leider etwas locker im Düsenstock

19 Apr 2016

sehr gute Sortiment mit ausgezeichneter Qualität

23 Mar 2016

Die Düsen sitzen etwas locker im Mischrohr. Aber nach einer kleinen Modifikation ist alles gut...

23 Mar 2016

einwandfrei

15 Mar 2016

Schade , es wäre schön, wenn die Fächer in denen die Düsen liegen die Größe angeben würden, da die Beschriftung auf den Düsen Bauartbedingt ja ziemlich klein ist.

12 Mar 2016

good

12 Mar 2016

good

16 Feb 2016

Schnelle Lieferung, top Qualität und super Kommunikation! Sehr Empfehlenswert!

11 Feb 2016

On my vespa px200e 24/24e carburetor. Works great

22 Jan 2016

👍 spitze

29 Dec 2015

Super Düsen!
Darf in kein Werkstatt fehlen.!!

28 Dec 2015

Sehr praktisches Set, in verschiedenen Größenbereichen lieferbar.

6 Oct 2015

Ptodukt leider immer noch nicht lieferbar,bzw.wurde immer noch nicht geliefert :-(

20 Jul 2015

Verarbeitung passt!

20 Jul 2015

Verarbeitung passt!

18 Jun 2015

Gute Abstufungen.

14 Jun 2015

Zum perfekten einstellen des si vergasers

9 Jun 2015

*****

13 May 2015

Super Preis

3 May 2015

Alles bestens.

24 Apr 2015

Great quality and a good range of main jets. I emailed another company to determine what jets are in the pack, they did not get back to me, it was clearly stated at scooter center

2 Apr 2015

Hilfestellung für Ihre Bewertung:
» Wie verwenden Sie das Produkt?
als Hauptdüsenersatz in einem Dellorto Vergaser
» Wem würden Sie das Produkt empfehlen?
jedem der sich einen Nicht-Serienauspuff oder größeren Zylinder gönnt.
» Was halten Sie von der Qualität des Produktes?
passt und works as intended

1 Apr 2015

Alles i.O so wie es sein muss.

29 Mar 2015

Super Qualität zum Top Preis!!!

23 Mar 2015

Einwandfrei

23 Mar 2015

Einwandfrei

26 Feb 2015

Ja,das Set ist natürlich super,zum fein Abstimmen des Vergasers.

22 Feb 2015

top

4 Feb 2015

rapport qualité / prix parfait

4 Feb 2015

rapport qualité / prix parfait

20 Nov 2014

Wie beschrieben alles dabei

18 Nov 2014

Qualität sehr gut!
Kann es nur jeden weiterempfehlen!

5 Nov 2014

Verbesserung VESPA PX200

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