What is the cause of this sound in my GTS?
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Member
Vespa GTS 250
Joined: 12 Aug 2015
Posts: 10

Mon Jan 13, 2020 7:27 am quote
Hey, I drove real fast the night before (against the limiter for 13km) and the next day when I drove 1-2km my GTS just broke down suddenly in the middle of a normal drive (50 km/h). When trying to ignite, it gives this horrendous sound. Any guesses what it could be? I have not yet had the chance to open it up. I appreciate any insights.

I recorded a video:
https://drive.google.com/file/d/1X0YDdh58t7roQK4p6u3lG9sIPieDDZGu/view?usp=sharing
Member
Vespa GTS 250
Joined: 12 Aug 2015
Posts: 10

Tue Jan 14, 2020 8:14 am quote
Any guesses?
Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni
Joined: 13 Oct 2012
Posts: 7912
Location: Ashburn, Va. Home to the Internet
Tue Jan 14, 2020 8:27 am quote
Sounds like the starter engaging and turning the motor over, then dis-engaging and still spinning.
I know some of the Vespa can get dirty Bendix that can causes this.
Hopefully JimC will reply.
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 37878
Location: Pleasant Hill, CA
Tue Jan 14, 2020 8:56 am quote
The GTS doesn't have a Bendix, it has a sprag clutch - and these can fail.

Whether it's that or a graunched bearing or piston can only be found out by dismantling.
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