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Framebreather design?

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models

Framebreather design?

Postby rogscoot » Tue Jul 01, 2025 1:22 pm

Was there a fundamental flaw with the S1 framebreather air intake design? Obviously it was changed over to the usual air intake we know and love later but was that a cost saving exercise or a way to fix some underlying issues?

Cheers,
Rog
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Re: Framebreather design?

Postby Knowledge » Wed Jul 02, 2025 8:02 am

A cost saving matter. Almost every modification Innocenti made to their Lambretta were to reduce production costs so look no further.
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Re: Framebreather design?

Postby Rich Oswald » Wed Jul 02, 2025 9:28 am

Knowledge wrote:A cost saving matter. Almost every modification Innocenti made to their Lambretta were to reduce production costs so look no further.


I'm not sure I agree with that Martin. I'm sure cost saving was always in their minds but improvements were made with every model i'm sure of that. Right from the Model A through to the GP/DL. Every new model was an improvement on the last from drum brakes to disc brakes, from LI150 gearbox to GP200 box, 18mm carbs to 22mm carbs, the list goes on. I can't see any of those as cost cutting. Just my thoughts.

Rich'
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Re: Framebreather design?

Postby steveg » Wed Jul 02, 2025 2:04 pm

rogscoot wrote:Was there a fundamental flaw with the S1 framebreather air intake design? Obviously it was changed over to the usual air intake we know and love later but was that a cost saving exercise or a way to fix some underlying issues?

Cheers,
Rog


The story I heard was that the air intake got covered by long coats, luggage etc and the engine couldn't breathe.
Something similar happened when a mate stuffed a rag into the toolbox of his Jet 200. Covered the air intake so it wouldn't run, cleared as soon as it was removed
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Re: Framebreather design?

Postby Rich Oswald » Wed Jul 02, 2025 5:02 pm

steveg wrote:
rogscoot wrote:Was there a fundamental flaw with the S1 framebreather air intake design? Obviously it was changed over to the usual air intake we know and love later but was that a cost saving exercise or a way to fix some underlying issues?

Cheers,
Rog


The story I heard was that the air intake got covered by long coats, luggage etc and the engine couldn't breathe.
Something similar happened when a mate stuffed a rag into the toolbox of his Jet 200. Covered the air intake so it wouldn't run, cleared as soon as it was removed


I have heard that too Steve.
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