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Jet -DELLORTO (type: 4576) SI- (135)

2555135
Jet -DELLORTO (type: 4576) SI- (135)
Jet -DELLORTO (type: 4576) SI- (135)

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) has been selected sufficiently small for most engines with 160.


(US)


AI-translation

 
€5.99 *

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Available immediately (delivery time 1-3 working days*)
P For this item you get fidelity point/s
Carburettor jets
used with carburettors brands: Dellorto
used as main jet in: Dellorto SI
diameter head: 5 mm
total length: 10 mm
OEM numbers (for comparison purposes only)
Dellorto 04576135_02
Customers alternatively searched for
Düse | Vergaserdüse | Hauptdüse | Sproeier | Buse | Mainjet | Main | Jet | Gicleur Principal | Getto Massimo | Chiclé |

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Part no.: 2555090 Jet size 90 Price
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Part no.: 2555092 Jet size 92 Price
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Part no.: 2555095 Jet size 95 Price
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Part no.: 2555096 Jet size 96 Price
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Part no.: 2555098 Jet size 98 Price
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Part no.: 2555100 Jet size 100 Price
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Part no.: 2555102 Jet size 102 Price
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Part no.: 2555104 Jet size 104 Price
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Part no.: 2555105 Jet size 105 Price
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Part no.: 2555106 Jet size 106 Price
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Part no.: 2555108 Jet size 108 Price
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Part no.: 2555110 Jet size 110 Price
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Part no.: 2555112 Jet size 112 Price
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Part no.: 2555114 Jet size 114 Price
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Part no.: 2555116 Jet size 116 Price
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Part no.: 2555118 Jet size 118 Price
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Part no.: 2555120 Jet size 120 Price
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Part no.: 2555122 Jet size 122 Price
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Part no.: 2555125 Jet size 125 Price
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Part no.: 2555128 Jet size 128 Price
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Part no.: 2555130 Jet size 130 Price
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Part no.: 2555132 Jet size 132 Price
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Part no.: 2555135 Jet size 135 Price
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Part no.: 2555138 Jet size 138 Price
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Part no.: 2555140 Jet size 140 Price
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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


10 Jan 2018

sehr gut

10 Jan 2018

sehr gut

10 Jan 2018

sehr gut

10 Jan 2018

sehr gut

10 Jan 2018

sehr gut warum jedes Teil einzeln ewerten? sehr aufwendig,wenn jemand viele Teile bestellt. Schreck bestimmt einige Kunden( Wie auch mich)öfters von der Bewertung ab!Gruß ***

21 Aug 2017

nice

17 Oct 2016

danke für die beratung

17 Oct 2016

alles gut

16 Oct 2016

Qualität gut

14 Oct 2016

Super alles klasse

14 Oct 2016

nach Umbau Motor 125 auf 150 ccm !

27 Mar 2016

Düse kam leider ohne Beschriftung an, liegt aber am Lieferanten, nicht am Scooter Center.

14 Mar 2016

Ottimo
Si
Per la mia vespa

14 Mar 2016

Ottimo
Si
Per la mia vespa

14 Mar 2016

Ottimo
Si
Per la mia vespa

6 Feb 2016

très bien

2 Sep 2015

alles perfekt - jederzeit wieder - nur zu empfehlen

2 Sep 2015

alles perfekt - jederzeit wieder - nur zu empfehlen

2 Sep 2015

alles perfekt - jederzeit wieder - nur zu empfehlen

2 Sep 2015

alles perfekt - jederzeit wieder - nur zu empfehlen

16 Aug 2015

top

16 Aug 2015

top

12 Aug 2015

Top Qualität!!!

15 Jun 2015

passt genau

27 May 2015

Good

27 May 2015

Good

26 May 2015

perfect

26 May 2015

perfect

20 May 2015

Ottimo

3 May 2015

wie bestellt

27 Apr 2015

Düst ab wie Sau

13 Mar 2015

SEHR GUT

13 Mar 2015

SEHR GUT

12 Jan 2015

qualità ok

12 Jan 2015

qualità ok

12 Jan 2015

qualità ok

12 Jan 2015

qualità ok

12 Jan 2015

qualita ok

17 Nov 2014

Alles nett aber was soll man zu soll Produkten auch sagen. Ist ja keine Raketentechnik.

7 Nov 2014

ich nutze dieses Produkt bei meiner Cosa 200. Alles in Top Qualität. Ich kann Scooter Center nur weiterempfehlen.

7 Nov 2014

ich nutze dieses Produkt bei meiner Cosa 200. Alles in Top Qualität. Ich kann Scooter Center nur weiterempfehlen.

7 Nov 2014

ich nutze dieses Produkt bei meiner Cosa 200. Alles in Top Qualität. Ich kann Scooter Center nur weiterempfehlen.

7 Nov 2014

ich nutze dieses Produkt bei meiner Cosa 200. Alles in Top Qualität. Ich kann Scooter Center nur weiterempfehlen.

7 Nov 2014

ich nutze dieses Produkt bei meiner Cosa 200. Alles in Top Qualität. Ich kann Scooter Center nur weiterempfehlen.

7 Nov 2014

ich nutze dieses Produkt bei meiner Cosa 200. Alles in Top Qualität. Ich kann Scooter Center nur weiterempfehlen.

5 Nov 2014

Originalteil in hervorragender Qualität!

5 Nov 2014

Macht was es soll

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