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Shutter and Thud when accelerating from stop
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@ellingwoodj avatar
ellingwoodj
UTC
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GTS250
Joined: UTC
Posts: 19
Location: Columbus, OH
 
ellingwoodj
Member
@ellingwoodj avatar
GTS250
Joined: UTC
Posts: 19
Location: Columbus, OH
UTC quote
When I accelerate from a stop quickly, I am getting a new shutter and thud that seems to be the roller weights grabbing the belt suddenly. If i accelerate very slowly from stop I can avoid this harshness that feels like the belt is suddenly getting grabbed. The sound it makes when it grabs does not sound good.
This belt was installed 4 months (2000) miles ago along with new roller weights at a scooter shop that has a qualified mechanic. The belt and weights are all Vespa OEM so I would not expect to have this so soon. 2008 GTS250
Any ideas what is wrong?
@madison_sully avatar
Madison Sully
UTC
Veni, Vidi, Posti
MP3 500, GTS 250 (both 2008 MY), 2013 Piaggio BV 350, 2014 Can Am Spyder RT
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Posts: 7661
Location: Madison, Wisconsin
 
Madison Sully
Veni, Vidi, Posti
@madison_sully avatar
MP3 500, GTS 250 (both 2008 MY), 2013 Piaggio BV 350, 2014 Can Am Spyder RT
Joined: UTC
Posts: 7661
Location: Madison, Wisconsin
UTC quote
Could be the belt shredding, or a few other things.
All of which should be clear when you open the transmission case.
@miguel avatar
Miguel
UTC
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2009 GTV250 (Gone), 2003 Inder trailer (also gone), 2001 BMW R1100RT
Joined: UTC
Posts: 5707
Location: Santa Cruz California
 
Miguel
Veni, Vidi, Posti
@miguel avatar
2009 GTV250 (Gone), 2003 Inder trailer (also gone), 2001 BMW R1100RT
Joined: UTC
Posts: 5707
Location: Santa Cruz California
UTC quote
It is a common symptom of having to debris build up on the clutch bell housing. The fix is to take it off and scuff it with 220 sandpaper. The bell housing is one of the first things you remove when you access the transmission. I scuff it up everytime I access the transmission, regardless if its been shuddering or not. BTW, the one thing my 2009 GTV doesn't do is "thud" so I'm not sure if your symptoms exactly match mine.

Best
Miguel
@little_karl avatar
little karl
UTC
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2023 Vespa GTS 300 Super
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Posts: 33
Location: Alabaster, Alabama
 
little karl
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@little_karl avatar
2023 Vespa GTS 300 Super
Joined: UTC
Posts: 33
Location: Alabaster, Alabama
UTC quote
"Shutter and Thud" sounds like a good band name!
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