Modern Vespa

The first series Vespa 90 used a 14mm gudgeon pin. I have a new piston with a new 14mm gudgeon pin, but no bearing. Can anyone recommend where I can buy a new one?

Hi, is it a small end bearing or was it a brass bush?

I was a small end bearing, but not even SIP stock them any more.

First series v90 with 14mm gudgeon pin used a bushing on connecting rod small end.

Later series and all models after, like the primavera, v100, used a 15mm gudgeon pin with needle bearing on small end of connecting rod, I believe.

Unless someone bored out the small end of the con-rod and replaced with a custom bearing.

Allstyles seem to have them halfway down the page here if it is indeed a bush that you need. I guess it depends on the small end on the crank, maybe you need a different piston

http://www.allstyles-scooters.com/acatalog/VESPA_BEARINGS.html

I feel like a complete fool. A friend stripped his V90 engine and I had to re-assemble it. I was so used to using a small end bearing, that I (and him!) thought he had lost it in the disassembly process. And none of us checked to see if it was needed.

All that matters is that we all found a solution! Now grab that bushing and get wrenching. Lets see a running video when you're done