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

newby

Postby smacmax » Tue May 19, 2020 7:30 pm

Could someone explain the difference between small block and big block lambretta engine.
does it apply to series 1 2 and 3
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Re: newby

Postby Fast n Furious » Tue May 19, 2020 8:03 pm

No. Big block engines only apply to series 3 and GP 200cc models.
125, 150 & 175 engines use the the small block casing and 200's use the big block.
Typically, the cylinder spiggot diameter of a small block barrel is 70mm and 75mm for the big block.
In essence.... the 125,150 &175 cylinders won't fit the big block casing and the 200 cylinders won't fit the small block casing.
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Re: newby

Postby smacmax » Tue May 19, 2020 8:11 pm

thank you
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