why vespa???

I think mine is a different case…This is a sound when crusing not when changing gears…I think I will have to go to my mechanic…but I don’t wanna open the engine again [:(]

anyway thanks everybody…

this weekend I went to my mechanic for a complete engine overhoul…it took his 2 complete days to completely clean all the parts and check for any problems…as I said we were suspecting a bent in the main shaft but we took it to a lathe operator and we couldn’t see any bent… the gears were ok. except one which has very slight wear. only the main bearing oil gasket was worn out and the bearing at the main shaft was not in good shape…we changed this items together with the main bearings…and we put some 90 sae oil to the 30 sae transmission oil…and guess what…still that f**ckin gear noise…
I quit man!! I’m going to ride with this till it breaks down…
Thanks everybody who have given me suggestions…