Air Box

[Littlewheels]

Can anyone tell me if all series 3 airbuses have the same diameter pipe at the top? Or are they larger for the bigger engines?

[hullygully]

I believe they're all the same, hence why we drill them out & remove the internals, but if you're after a bigger int dia then I think Scooter Resos do one bud

[Knowledge]

There are different diameter of tube between the scoop and the main box.

The late models all have the widest entry to the box. See page 212 of Sticky’s green edition of the Spanner’s guide to the Lambretta for some photos