Spiral diaphragm performance upgrade?

[brian400ex]

Will these improve performance at all?

 

[Clubin]

It’s making the carb better. It eliminated a bunch of the problems that were associated with ethanol. It’s a good investment.

 

[Seandonato73]

Its also covered in the carb sticky....

 

[Termy82]

Spiral diaphragm eliminate the problem of ethanol in gasoline that with time to use damage the rubber of membrane . With this mod you’ll eliminate big part of carb maintain .now in Europe petrol gasoline have 5% of ethanol but for example in the uk have 10% of ethanol that damage very fast membrane of carb

 

[Rep732]

The U.S also has 10% ethanol as well.