Scooterotica

can anyone explain why a Lambretta is designed to run at 4% when a Vespa is running 2% ? This seems to affect kits as well with the Lambretta still needing more oil in the mix.

I'd have thought the pistons and barrels are the same material so so why the difference ?

It`s to do with the way the fuel/oil mix is fed into the engine.
Vespa`s are crank induction so the mix lubricates the crank big end on the way in and then the barrel piston area.
Lambretta`s are piston induction so the mix needs more oil to ensure the big end gets enough.

Bofs wrote:It`s to do with the way the fuel/oil mix is fed into the engine.
Vespa`s are crank induction so the mix lubricates the crank big end on the way in and then the barrel piston area.
Lambretta`s are piston induction so the mix needs more oil to ensure the big end gets enough.

A fair explanation.....so why do some of the lambretta lads lower the percentage on kits ? surely the same amount of oil is needed to lubricate the big end ?

Thanks for the reply

Because modern cranks have better designed conrods to aid lubrication and also better big end bearings. Also oil technology has moved on loads since the 60's