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Original Weber Carburettor Tech Sheet/Calibration/Jet Settings for a 26 OC 10 FIAT 500 Giardiniera – 499 cc Mod. 1969

Part Number: 20405 Category:



This is an original weber factory ‘inside’ tech sheet which has been converted into a PDF for digital download.

Once downloaded, this file will provide you with all the original WEBER factory calibration settings, including Jets, chokes, venturis, fuel float needle valves, throttle valves, progression hole specifications, pump/exhaust spill valves, main jets, pump jets, emulsion tubes, float levelling measurements and more.

The WEBER carburettor model and original manufacturer part number, vehicle make & model and production year,  is included within the download sheet and is also shown in the download title above.. Make sure you get it right!

This is an invaluable source of authentic, weber factory technical data, referring to the original weber carburettor fitted to your engine.

This information will help you establish if the carburettor is actually the original and correct one for your vehicle but also to determine if your carburettor is jetted correctly.

If not, you will now have the original and ‘correct’ specifications to make appropriate changes where necessary.

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If your order contains digital products only, then an email with a link to download your copy will be sent out to your email address automatically, once you have completed your order/payment/checkout.

So this way, you will have instant access to your WEBER Carburettor specifications.


If you are purchasing a digital product (such as this download PDF) PLUS any other physical products from our shop, the email link for the digital download will be sent out to you once the full order (including physical products) has been dispatched. Timescale for this is typically 1-2 days.

You can email us to request your digital download to be manually emailed to you sooner if you are in a hurry!.

Following download on to your device please save and/or print it for your future reference.

Whilst there is no physical delivery for this digital product, your billing/delivery address is still required for payment/checkout in the shopping cart.

We hope that you will find this information sheet useful and valuable for restoring, maintaining and servicing your classic motor : )

WEBER carburettors, service parts & tools Shop

Other Weber carburettor factory spec sheets

Contact us if you have any questions.



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