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Tethys - 2012 GTS 300
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Tethys - 2012 GTS 300
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2012 GTS 300 - before all the fancy stuff was added.

I've got a new sound I haven't heard before. It is a vibration and growly sound. On the interstate but not wot, when I let off the throttle it feels kind of like the road has been surfaced. Just not as intense as that. Definitely a firm vibration coming up through the floorboard though. Eases up as I continue decelerating. Goes away if I accelerate or brake. (braking doesn't cause it, but can stop it.)


No lights come on. Oil, coolant ... all check ok.

Any advice, comments, or hypotheses will be appreciated.
Kim
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Molto Verboso
portofino green GTV 300
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Molto Verboso
portofino green GTV 300
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I'm gonna take a guess here and say it sounds like a brake issue, something rubbing that you would notice more when slowing but goes away when braking.
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Ossessionato
2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
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2016 Vespa GTS300ie abs/asr/ess Settantesimo '70'
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Location: East Anglia, UK
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Has the bike been serviced recently? Have you had new tyres or a single tyre? A drive belt problem can sometimes cause a similar vibration with the teeth of the belt actually making the sound against the 'transmission jockey wheel'.

I had a guy come in with a similar issue and it turned out he'd lost his wheel balance weights off the rear wheel. They are self adhesive and the heat can sometimes make them come unstuck especially if the tyre fitter didn't clean the wheel rim properly first before fitting. This of course caused the wheel to be out of balance by quite some way and it was this causing the vibration and slight noise.

I rebalanced the wheel and he was fine and dandy.

So it could be that, or it may be a brake issue but not likely if you can't feel the bike slowing unduly. Come back if you can with some more info re the above.
@attila avatar
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Veni, Vidi, Posti
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
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@attila avatar
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
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Opening and checking all the transmission block (variator, belt and clutch) would not be a bad idea ...
@wbdvt avatar
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Molto Verboso
'16 Sprint S 150, 2 x '06 GTS 250, '12 GTS 300, '74 Vespa 150 Super
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@wbdvt avatar
'16 Sprint S 150, 2 x '06 GTS 250, '12 GTS 300, '74 Vespa 150 Super
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what fancy stuff has been added?
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Tethys - 2012 GTS 300
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Tethys - 2012 GTS 300
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wbdvt wrote:
what fancy stuff has been added?
Ah, no, I meant my GTS is from before hpe, ABS, ASR. That fancy stuff.

Tires are two years old, belt change was 1,000 miles ago. And, I don't remember if I had weights on the wheel.

I've set up an appointment with a dealer that is a couple of towns over. This is their busy season but luckily they are able to work me in a couple of weeks.
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GTS 300ie Touring 2013 - Signora D'argento
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I've got very similar symptoms on my 2014 (non ABS) GTS. Mine is very much speed specific, the vibration normally occurs between the speeds of around 35 ~ 45 mph. The vibration seems to come from the front of the scooter. I've got both wheels balanced, so tending to discount that theory. I think it might be a vibration induced resonance brought on by a certain speed. If so, I don't know what could possibly be the source. I'd be interested to know the verdict of your dealer.
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2010 S50 Modified "Punkin"; 2003 ET4 Malossi 187 "ISO"
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2010 S50 Modified "Punkin"; 2003 ET4 Malossi 187 "ISO"
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Greetings:

Check the 3 screws holding the heat shield on the exhaust. Also check the exhaust mounting bolts themselves. I had a similar issue on my S50. Blue LocTited all of it and no trouble since.
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Tethys - 2012 GTS 300
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Tethys - 2012 GTS 300
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I will definitely check that! It would be a nice cheap fix for sure.
Kim
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Tethys - 2012 GTS 300
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Tethys - 2012 GTS 300
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Appt next week - still hoping for heat shield
I have an appointment with the dealer for next week. But I'm still hoping it is the heat shield. There does seem to be a fair amount of play. But, I can neither loosen or tighten those screws. Getting some PB Blaster to see if that can help.

Is it supposed to be rock solid, or can there be some wiggle.

Grasping for straws hoping it is a quick fix. I'll definitely let you know what it ends up being. I hate it when people don't post the final resolution.

Kim
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2007 LX150 2015 GTS (on the bench) 2017 BV 350
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@fledermaus avatar
2007 LX150 2015 GTS (on the bench) 2017 BV 350
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Re: Appt next week - still hoping for heat shield
KimPossible wrote:
Is it supposed to be rock solid, or can there be some wiggle.

Can be some play. There are rubber grommets between the screws and the shield....shouldn't be "rattly" loose, but slight resistance to wiggle.
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Tethys - 2012 GTS 300
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Tethys - 2012 GTS 300
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dropped it off at the shop - just glazing?
The shop is about 20 miles away. Of absolute course I did not have the issue on the way to the shop. But, somehow I turned off one exit too early which took me through a very low-speed open air mall.

New sound! A kind of whirring-chittering sound on low-speed acceleration. I suck at describing sounds. Anyway, in talking to the manager he very politely didn't say that I suck at describing sounds. But, after he rode it to the back, he said he heard it and it sounds like clutch issues. "Not sure until they open it up, but it could be the 'shoes, sheafs, or bushings'."

Alarmingly he said it might be cheaper to just replace the whole back end. That sounds bad to me!

I didn't have the shuddering on initial acceleration that is often described, but does this sound like it could just be glazing on the clutch? I'd hate to replace a backend if I could follow the steps given here on MV to deglaze the clutch bell and pads.

I dropped it off this weekend so I didn't have to take a day off work. But the actual appointment for it is on Friday. Guess I'll wait and see.

Kim
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Molto Verboso
S150 '09, Beo 500ie '08
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Bad bearings, perhaps? How many miles on the scooter?
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Tethys - 2012 GTS 300
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Tethys - 2012 GTS 300
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Juan_ORhea wrote:
Bad bearings, perhaps? How many miles on the scooter?
Lots, just shy of 20k.

Kim
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2009 LX 150, 2024 GTS Super
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@cosmos avatar
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Could be something as simple/ inexpensive as the belt cover bearing. The manager may be referring to replacing the clutch/ driven pulley assembly if those bearings are bad. Both are possible at 20,000 mi, although my bet is the cover bearing.
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Veni, Vidi, Posti
GT 2.4
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UTC quote
I've had the weird vibration from the floorboard when a belt started to come apart. If your clutch is failing, and out of balance, that might cause the belt to start breaking up, so you might need a belt and clutch, but it's all speculation until they open it up.
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Tethys - 2012 GTS 300
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Tethys - 2012 GTS 300
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Woot!
It was the clutch nut had worked a little loose. They retorqued it and it's good to go. Shew! Much better than needing a new clutch assembly.
@wheelman-111 avatar
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2010 S50 Modified "Punkin"; 2003 ET4 Malossi 187 "ISO"
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2010 S50 Modified "Punkin"; 2003 ET4 Malossi 187 "ISO"
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UTC quote
Greetings:

I would have some hard questions for whomever.torqued - or Failed to Torque - that nut down last time.
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GTS 300ie Touring 2013 - Signora D'argento
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@touring300 avatar
GTS 300ie Touring 2013 - Signora D'argento
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UTC quote
Re: Woot!
KimPossible wrote:
It was the clutch nut had worked a little loose. They retorqued it and it's good to go. Shew! Much better than needing a new clutch assembly.
I'm glad your dealer found what was responsible for your weird sound/vibration Kim.

My clutch nut is good and tight, so I think my peculiar sound/vibration is the notorious Vespa Cricket, and I shall have to live with it.....

Cricket sound when crusing at 80km/hr

strange sound between 40 and 45 mph

Andrew
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