OP
Tue, 27 Dec 2016 10:54:10 +0000

Member
300GTS - 2015
Joined: Sat, 26 Apr 2014 21:07:22 +0000
Posts: 31
Location: United Kingdom
 
OP
Member
300GTS - 2015
Joined: Sat, 26 Apr 2014 21:07:22 +0000
Posts: 31
Location: United Kingdom
Tue, 27 Dec 2016 10:54:10 +0000 quote
Hi all, I hope you each had a good Xmas. I'm about to resume my investigations on this and I'm desperate to get it sorted out as it's back to work for me tomorrow....hopefully not on the train!

I'd like to check the spark plug - just to rule that out - but the HT cable is secured so tightly and with the limited hand-space to manoeuvre in it's really difficult to get to it.

In order to give you all something more to consider, I've taken a short video of what's happening as I attempt to start the scooter. Right at the beginning you can hear the fuel pump prime. Let me know if this sheds any more light on it.

Thanks!
Tue, 27 Dec 2016 11:04:27 +0000

Ossessionato
Vespa LX150 GTS250ie GTS300x2 sold 'em
Joined: Fri, 11 Dec 2009 19:02:56 +0000
Posts: 2371
Location: St. Pete, Fla
 
Ossessionato
Vespa LX150 GTS250ie GTS300x2 sold 'em
Joined: Fri, 11 Dec 2009 19:02:56 +0000
Posts: 2371
Location: St. Pete, Fla
Tue, 27 Dec 2016 11:04:27 +0000 quote
The experts will be here in a little while with a more knowledgeable answer, but I say your problem is with your starter is not engaging. This needs to back to the dealer for this repair if it is still under warranty.
Tue, 27 Dec 2016 11:31:34 +0000

Enthusiast
Vespa GS 160 mk1 MISA / Vespa GL-B 150 MISA / Vespa GTS300 super / Vespa LX50 4V
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Vespa GS 160 mk1 MISA / Vespa GL-B 150 MISA / Vespa GTS300 super / Vespa LX50 4V
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Tue, 27 Dec 2016 11:31:34 +0000 quote
Sounds like the same problem:
Starter is turning and not engaging.
lostboater wrote:
The experts will be here in a little while with a more knowledgeable answer, but I say your problem is with your starter is not engaging. This needs to back to the dealer for this repair if it is still under warranty.
Agree, you still have 5 months of warranty.
Tue, 27 Dec 2016 17:10:59 +0000

Hooked
Triumph 900 Bonnie
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Hooked
Triumph 900 Bonnie
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Location: Sussex coast.
Tue, 27 Dec 2016 17:10:59 +0000 quote
Ah-ha! At last we have it. Your fault lies in the sprag clutch (a sort of intermediary between the starter motor and the crank shaft). It's not really a DIY job and, as has already been said, it's still under warranty.

Sorry dude, it's the train in the morning. Followed by a call to your dealer. Bummer, but there it is.
Tue, 27 Dec 2016 20:51:02 +0000

Enthusiast
Vespa GS 160 mk1 MISA / Vespa GL-B 150 MISA / Vespa GTS300 super / Vespa LX50 4V
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Vespa GS 160 mk1 MISA / Vespa GL-B 150 MISA / Vespa GTS300 super / Vespa LX50 4V
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Tue, 27 Dec 2016 20:51:02 +0000 quote
@simon64ds I'm just curious and for future knowledge, which part is exactly broken?

Do you mean the connection between the starter gear (number 4) and the crankshaft.


Or do you mean the woodruff key (number 10) / freewheel (number 4)
Tue, 27 Dec 2016 22:08:29 +0000

Hooked
2010 Vespa super,2016 vespa 3 00 1979 p200 with sidecar 1958 cu shman eagle with sidecar Inder trai ler 1983 bajaj tuk tuk tristar 2018 royal Enfi
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Hooked
2010 Vespa super,2016 vespa 3 00 1979 p200 with sidecar 1958 cu shman eagle with sidecar Inder trai ler 1983 bajaj tuk tuk tristar 2018 royal Enfi
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Tue, 27 Dec 2016 22:08:29 +0000 quote
Sprag clutch
There is no doubt about it don't try this yourself this is a dealership job with lots of stuff to mess up if you error. Just a poor peice of luck. Capt Gary
Tue, 27 Dec 2016 22:11:13 +0000

Hooked
Triumph 900 Bonnie
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Triumph 900 Bonnie
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Tue, 27 Dec 2016 22:11:13 +0000 quote
It's item number 4 (freewheel) more commonly known as a sprag clutch. It's designed to apply torque in one direction and slip in the other. When it wears (or, sometimes, gums up) it fails to grip and the starter just spins.

Here's a link to sprags in general..

https://en.m.wikipedia.org/wiki/Sprag_clutch
Tue, 27 Dec 2016 22:35:13 +0000

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: Sun, 26 Aug 2007 20:16:15 +0000
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Location: Pleasant Hill, CA
 
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: Sun, 26 Aug 2007 20:16:15 +0000
Posts: 41938
Location: Pleasant Hill, CA
Tue, 27 Dec 2016 22:35:13 +0000 quote
As above, that video nails it - the sprag clutch has jammed open. I've not heard of that before, I've only encountered broken sprag clutches - which make a horrible noise.

Getting the water pump/flywheel cover/stator off is OK without special tools (I did one of ours last week) but getting the flywheel off does require pullers etc, preferably the correct Piaggio ones. I've always let a dealer do that!

As it's under warranty, let the dealer fix it. Just tell them the sprag clutch has failed, and hopefully they can collect the scoot and fix it.
Wed, 28 Dec 2016 07:40:55 +0000

Enthusiast
Vespa GS 160 mk1 MISA / Vespa GL-B 150 MISA / Vespa GTS300 super / Vespa LX50 4V
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Vespa GS 160 mk1 MISA / Vespa GL-B 150 MISA / Vespa GTS300 super / Vespa LX50 4V
Joined: Sat, 26 Nov 2016 22:19:38 +0000
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Location: The Netherlands
Wed, 28 Dec 2016 07:40:55 +0000 quote
@simon64ds Thanks for the explanation about the sprag clutch.
Wed, 28 Dec 2016 09:54:57 +0000

Hooked
Triumph 900 Bonnie
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Location: Sussex coast.
 
Hooked
Triumph 900 Bonnie
Joined: Wed, 11 May 2016 09:29:54 +0000
Posts: 320
Location: Sussex coast.
Wed, 28 Dec 2016 09:54:57 +0000 quote
@Pilaf, you're most welcome Happy New Year!
OP
Wed, 28 Dec 2016 13:00:49 +0000

Member
300GTS - 2015
Joined: Sat, 26 Apr 2014 21:07:22 +0000
Posts: 31
Location: United Kingdom
 
OP
Member
300GTS - 2015
Joined: Sat, 26 Apr 2014 21:07:22 +0000
Posts: 31
Location: United Kingdom
Wed, 28 Dec 2016 13:00:49 +0000 quote
Many thanks to all of you - I'll follow up with my dealer as it's still under warranty.

I'll post again in due course regarding the outcome, hopefully all good.

Regards!
Wed, 28 Dec 2016 13:50:58 +0000

Ossessionato
Vespa LX150 GTS250ie GTS300x2 sold 'em
Joined: Fri, 11 Dec 2009 19:02:56 +0000
Posts: 2371
Location: St. Pete, Fla
 
Ossessionato
Vespa LX150 GTS250ie GTS300x2 sold 'em
Joined: Fri, 11 Dec 2009 19:02:56 +0000
Posts: 2371
Location: St. Pete, Fla
Wed, 28 Dec 2016 13:50:58 +0000 quote
Re: Sprag clutch
capt. gary wrote:
There is no doubt about it don't try this yourself this is a dealership job with lots of stuff to mess up if you error. Just a poor peice of luck. Capt Gary
Spoken by an expert as his sprag clutch went out on a Oyster Tour last year in FLA and his scooter ended up in Atlanta for the repair. But that is another story.


Contemplating the problem


Off to the repair house

OP
Fri, 06 Jan 2017 07:49:21 +0000

Member
300GTS - 2015
Joined: Sat, 26 Apr 2014 21:07:22 +0000
Posts: 31
Location: United Kingdom
 
OP
Member
300GTS - 2015
Joined: Sat, 26 Apr 2014 21:07:22 +0000
Posts: 31
Location: United Kingdom
Fri, 06 Jan 2017 07:49:21 +0000 quote
simon64ds wrote:
Ah-ha! At last we have it. Your fault lies in the sprag clutch (a sort of intermediary between the starter motor and the crank shaft). It's not really a DIY job and, as has already been said, it's still under warranty.

Sorry dude, it's the train in the morning. Followed by a call to your dealer. Bummer, but there it is.
**UPDATE**

Returned to dealer this week and they are currently replacing the starter clutch citing the sprag as the problem. Hoping to have it back in the next couple of days.

Hats off to simon64ds and to all of you kind people on the board who provided support and suggestions.
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