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GTV - Popping and Stalling
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Simon W
UTC
Enthusiast
GTS 300
Joined: UTC
Posts: 69
Location: London, UK
 
Simon W
Enthusiast
GTS 300
Joined: UTC
Posts: 69
Location: London, UK
UTC quote
Morning from an unusually sunny London.....

My 2008 250 GTV has been a reliable workhorse and has been one of my fave Vespa ownership experiences.
On anything up to 30 minutes (through London traffic) the bike is perfect.
However, after 30 / 40 minutes of riding, I get exhaust popping / overruns and every time I roll of the throttle at a stop, the bike stalls. Takes quite a few seconds to start up again.

I assume it's heat related, but can't think why it would be doing this. Bike is standard other than a Leo Vince exhaust (which I don't like and would prefer to return to standard - any tips on where to find a 2008 standard exhaust / part number...?)
But my main question - any educated thoughts on why this might be happening? And how I might be able to sort it...?
Cheers,
Simon
Supertjeduc
UTC
Enthusiast
Vespa sei giorni 2018
Joined: UTC
Posts: 91
Location: Netherlands
 
Supertjeduc
Enthusiast
Vespa sei giorni 2018
Joined: UTC
Posts: 91
Location: Netherlands
UTC quote
Coil?
@srd0060 avatar
srd0060
UTC
Hooked
2022 Super tech/ 91 PX 200e/97 PX 200e
Joined: UTC
Posts: 147
Location: Australia
 
srd0060
Hooked
@srd0060 avatar
2022 Super tech/ 91 PX 200e/97 PX 200e
Joined: UTC
Posts: 147
Location: Australia
UTC quote
as above coil or fuel pump
OP
Simon W
UTC
Enthusiast
GTS 300
Joined: UTC
Posts: 69
Location: London, UK
 
Simon W
Enthusiast
GTS 300
Joined: UTC
Posts: 69
Location: London, UK
UTC quote
Thanks - so assume the temp of the engine affects the coil?
Supertjeduc
UTC
Enthusiast
Vespa sei giorni 2018
Joined: UTC
Posts: 91
Location: Netherlands
 
Supertjeduc
Enthusiast
Vespa sei giorni 2018
Joined: UTC
Posts: 91
Location: Netherlands
UTC quote
Yes
@abner_bjorn avatar
Abner_Bjorn
UTC
Molto Verboso
2007 GT200, 2008 Yamaha C3, 2009 BV250
Joined: UTC
Posts: 1233
Location: Denver
 
Abner_Bjorn
Molto Verboso
@abner_bjorn avatar
2007 GT200, 2008 Yamaha C3, 2009 BV250
Joined: UTC
Posts: 1233
Location: Denver
UTC quote
How many miles on the scooter, and have the valve lash ever been checked? Sounds like it could be a tight exhaust valve closing to zero when the engine heats up.
OP
Simon W
UTC
Enthusiast
GTS 300
Joined: UTC
Posts: 69
Location: London, UK
 
Simon W
Enthusiast
GTS 300
Joined: UTC
Posts: 69
Location: London, UK
UTC quote
Hi Abner,
35,000km on the clock - no idea about the valve lash (don't know what that is....)

But sounds like the coil is a good place to start - easy DIY? Or better to take it to the prof's?
@wbdvt avatar
wbdvt
UTC
Molto Verboso
'16 Sprint S 150, 2 x '06 GTS 250, '12 GTS 300, '74 Vespa 150 Super
Joined: UTC
Posts: 1562
Location: Vermont
 
wbdvt
Molto Verboso
@wbdvt avatar
'16 Sprint S 150, 2 x '06 GTS 250, '12 GTS 300, '74 Vespa 150 Super
Joined: UTC
Posts: 1562
Location: Vermont
UTC quote
I would check the valve clearance first. Scooterwest YouTube channel has a video on how to do this
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