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bgm pro faster flow Vespa si26

bgm PRO FASTER FLOW Vespa Dellorto / Spaco SI 24-26 carburettors

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bgm PRO FASTER FLOW SI carburettor for the fast Vespa

The SI carburetor series is a million proven design with great potential.

Especially in the last few years, the carburetors are due to their compact design and short suction paths has also become more popular again on performance-enhanced engines.

Buy Vespa Faster Flow carburetors here

With an increase in engine performance the nozzles in the carburetor must also be adjusted. With the current engine concepts, main jets larger than 140 are not uncommon. To a uninterrupted fuel supply with larger main jets To ensure that the carburettor has to be processed quite laboriously or our finished carburettors have to be used:

PRO FASTER FLOW SI carburetor

SI FASTER FLOW tuning carburetor for Vespa

We can offer you the optimally finished carburettor for your engine project. So you keep the original SI carburetor as a backup and get a professionally tuned carburetor. You can find ours here PRO FASTER FLOW SI carburetor

Safe and fast on the go without losing weight

With the optimized bgm PRO Faster Flow carburetor you can also Achievements well over 20 hp with continuous full throttle drive without losing weight or other problems.

Carburettor already finished
In order to ensure an uninterrupted fuel supply with larger main nozzles, the carburetor must be processed in a very complex way or our ready-made carburetors must be used straight away:
Buy Vespa Faster Flow carburetors here

Details on the optimized 26 SI carburetors

With our carburetor tuning Float chamber cover, nozzle holder and holes professionally edited.

In detail, the hole for the float needle is enlarged to 2,8mm and the guide for the float needle is provided with two additional holes for faster fuel supply.

 

Faster Flow float hole

 

Important: The sealing surface of the float needle seat is restored with a tool made after drilling.

 

SI Faster Flow float valve

 

Fine tuning: The float level is checked and set to 32mm.

 

SI Faster Flow 029

 

The 5,2mm float needle is spring-loaded and helps the float needle to have a longer service life - it has to interrupt the flow of fuel several thousand times an hour and then release it again.

 

SI Faster Flow 042

Fast and constant spray supply up to 180 main nozzle

The enlarged valve bore In the float needle seat and through the additional holes in the guide for the float needle, the fuel flows in unhindered. This means that the fuel level in the float chamber remains constant.

So that the fuel can flow sufficiently quickly to the nozzle assembly, the bore from the float chamber to the nozzle assembly is enlarged from 1,2mm to 1,8mm. This diameter is with a 180 Dellorto main jet equate - this nozzle size can also be used if required.

We are currently not aware of any engines that require a main jet in the region around 180. The Fasterflow therefore still offers reserves in this area.

Touring setup with 25HP with main jet up to 160

In current touring engines with approx. 20-25PS, main jets in the range of 135-160 are often used.

SI Faster Flow 040

Leaning during the acceleration phase or swallowing due to lack of fuel during load changes are a thing of the past with the right nozzle equipment.

25s are the better 26s SI carburettors

On closer inspection you will find that the carburetor marked as 26/26 has an effective bore of 25mm.

SI Faster Flow 041

 

Vespa SI carburettor with a bore of real 26mm are prone to premature, high wear in the area of ​​the slide guide. Once this sensitive area is worn out, the carburetor is unusable.

Due to the small overlap of slide and guide with a 26mm bore, additional air can cheat past the slide in the worn areas of the guide and strongly influence the running smoothness of the engine.

This goes up to the involuntary revving up while idling and noticeable emaciation or lean jerking when accelerating.

Therefore the bgm PRO 26er SI - carburettors are provided with an optimal effective bore of 25mm.

Tip: bgm PRO Faster Flow fuel tap

Together with our bgm PRO Faster Flow fuel tap the revised carburettors are a perfect system for a reliable fuel supply.

Vespa fuel tap - the original! Vespa tuning fuel tap bgm Faster Flow

faster flow petrol tap vespa

Si tuning carburetor Vespa
The current version of the Fasterflow carburetor with 25mm is an inconspicuous and permanent companion for many kilometers. The wear of the slide guide is reduced to the possible minimum by a larger overlap.
Buy Vespa Faster Flow carburetors here

 

 

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Faster Flow Vespa

BGM Faster Flow fuel tap Vespa PX, Rally, Sprint, V50, PV, PK

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Faster Flow Vespa

PROBLEM:

The fuel supply of the Vespa largeframe Models is always a bit problematic due to the small height difference between the tank and the float chamber level of the carburetor.
If the engine is converted to a different type of carburettor, its float chamber is usually higher than that of the original SI counterpart. In the case of very petrol-hungry engines, this can quickly lead to an undersupply, which leads to the mixture becoming lean and, in the worst case, this in turn can result in engine damage.

A central throttling point in the fuel flow is of course the fuel tap. The original tap has an average flow rate of just under 300ml / min. That would of course also be sufficient for the most powerful engine, because 300ml / min would correspond to a consumption of 18 liters per hour.

VIDEO

With the PX, Rally, Sprint and similar models, however, as I said, it is more important to minimize the flow resistance in order to always have the highest possible pressure on the carburetor. To illustrate the flow rate, we have set up an experimental setup with three different petrol taps. We were also amazed by the clear result.
So far, the golden rule has been that for engines that are significantly more powerful than an original engine, a flow rate of at least 400ml / min should be aimed for.

SOLUTION:

Our new Faster Flow fuel tap not only doubles this amount, it adds another 100ml / min on top! So it has twice the flow rate of a conventional FastFlow fuel tap and an unbelievable three times the amount compared to an original fuel tap!

This makes it an ideal addition to all high-performance setups and offers a secure basis to prevent gasoline supply problems in the beginning.

The Faster Flow fuel tap is available in two versions:

  1. bgm PRO Faster Flow with manual reserve position (BGM3030)
  2. bgm PRO Faster Flow electronic reserve indicator (BGM3031)
BGM fuel tap Faster Flow 900ml / min

BGM fuel tap Faster Flow 900ml / min with electronic reserve indicator

version 1 with reserve position corresponds to the functionality of a fuel tap as it was installed in all PX models up to 1984 as well as all V50, PV and PK S models. When the reserve level is reached, manual switching of the fuel tap is necessary. Nice feature on the side: The FasterFlow tap has a larger reserve volume (approx. 1 liter) than an original fuel tap.

version 2 has only one open / closed position, but has a built-in float with which the reaching of the reserve quantity can be indicated via a control lamp (not supplied).

Here are some more tips:

  1. Do not use petrol filters with paper fleece, they almost halve the flow rate!
    Our OMG fuel filter with plastic filter mesh offer the full flow rate without throttling!
  2. Always pay attention to the tank cap ventilation and clean it if necessary!
  3. Dell'Orto SI carburetor with the Float chamber cover of the Vespa COSA equip. This has a float needle valve with 5,2mm and thus an improved flow.
  4. Dell'Orto PHBH carburetor with a Float needle valve (including seat!)> 200 equip. Here, too, there is less resistance to the flow of fuel due to the larger bore.
  5. Use a fuel hose with internal wire reinforcement to effectively prevent kinks in the fuel hose (TS006)
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