If you're looking for the industry leading guide to repairing and maintaining your Vespa then the Haynes manual is the answer.

 

Used by professional mechanics and DIY'ers the manual offers detailed information on how to diagnose problems with your Vespa which in itself can save a lot of money before asking a garage to try to identify any faults.

 

Buying a Haynes manual is a must if you're serious about maintaining your Vespa.