J-series frame cracks

Technical section for all Lambretta's:
Junior series: J50, Cento, J125, (Super)
Lui, Vega, Cometa
Mopeds <50cc

J-series frame cracks

Postby kurt » 10 Aug 2009 11:22

On several occasions I heard about frames that crack, especially on early J models.
I've been told the tearing starts somewhere under the engine covers and finally comes visible outside the covers. Innocenti even did some frame swaps under warranty.
I recenty worked on two J50's ('66 & '69) but didn't noticed any cracking.
Who knows more about this or did ever seen this in real? Where exactly is the crack starting? Is any strengthening advisable on a frame without cracks yet?
I would hate to see a newly painted frame start cracking ofter some months of use. :(
On later J-models like Startstream this problem was solved by Innocenti.
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