OP
UTC

Hooked
2009 250 GTS Super
Joined: UTC
Posts: 455
Location: pasadena, los angeles
 
Hooked
2009 250 GTS Super
Joined: UTC
Posts: 455
Location: pasadena, los angeles
UTC quote
Hi, my Vespa has this symptom where it has a momentary loss of power upon acceleration.

When it first started happening I did research online and some suggested that it may be a dirty air filter blocking air flow. Since I had never cleaned the air filter I thought this could have been the issue. I cleaned the air filter, which was pretty dirty and thought this was the problem.

The momentary loss of power continued to happen. Then all of a sudden, as I was traveling on the freeway, the Vespa completely cut off and the engine cut off. The Vespa was towed to the dealership where they changed the cap on the spark plug and the engine would turn on.

However, the momentarily loss of power still continues. Imagine accelerating and then a split second the acceleration stutters, almost like a hiccup. I've noticed that this only happens after about 20-30 minutes of riding, if it is a short ride of less than 20 minutes, i won't experience it.


Does anybody have any idea what's going on? I've been hesitating taking the Vespa out on longer drives for this reason and has really put a hamper on my enjoyment.
@gtdespatchcourier avatar
UTC

Molto Verboso
GTS 300ie
Joined: UTC
Posts: 1645
Location: Sunshine Coast, Australia
 
Molto Verboso
@gtdespatchcourier avatar
GTS 300ie
Joined: UTC
Posts: 1645
Location: Sunshine Coast, Australia
UTC quote
Could be a dodgy kill switch.
UTC

Hooked
GT200, GTS300
Joined: UTC
Posts: 103
Location: Sydney, Australia
 
Hooked
GT200, GTS300
Joined: UTC
Posts: 103
Location: Sydney, Australia
UTC quote
Hi

I had the same issue with my GTS300 super sport. After having the ht cap checked and a full service the issue remained. I then heard about a remap of the ECU being available and had this done 2 weeks ago. Since then the issue has not recurred. This may or may not be related to the remap but so far so good. I would advise you to check with a dealer if this might work for you.

Good luck

WD
@david_masse avatar
UTC

Ossessionato
2016 Vespa GTS 300 i.e. ABS sold, 2010 Vespa GTS 300 ie Super (sold) & 2003 Honda Shadow VT750 ACE (sold) & 2006 Vespa LX150 (sold)
Joined: UTC
Posts: 3196
Location: Toronto (formerly Montreal)
 
Ossessionato
@david_masse avatar
2016 Vespa GTS 300 i.e. ABS sold, 2010 Vespa GTS 300 ie Super (sold) & 2003 Honda Shadow VT750 ACE (sold) & 2006 Vespa LX150 (sold)
Joined: UTC
Posts: 3196
Location: Toronto (formerly Montreal)
UTC quote
I had that problem. It turned out to be a faulty fuel injector.

It took the dealer quite a few attempts to diagnose since it was intermittent. Finally the ECU kicked out an injector fault code. Installed a new injector and that was it.

Initially it was thought the culprit was the plug or HT lead or cap.
@turkman avatar
UTC

Ossessionato
2009 GTV 250
Joined: UTC
Posts: 2533
Location: Olympia, WA
 
Ossessionato
@turkman avatar
2009 GTV 250
Joined: UTC
Posts: 2533
Location: Olympia, WA
UTC quote
Same with me...
davidmasse wrote:
I had that problem. It turned out to be a faulty fuel injector.

It took the dealer quite a few attempts to diagnose since it was intermittent. Finally the ECU kicked out an injector fault code. Installed a new injector and that was it.

Initially it was thought the culprit was the plug or HT lead or cap.
.....had a new fuel injector installed problem gone.
@honeybadger avatar
UTC

Molto Verboso
MP3 500 (2) MotoGuzzi California 1400
Joined: UTC
Posts: 1675
Location: SF Bay/Roseville CA
 
Molto Verboso
@honeybadger avatar
MP3 500 (2) MotoGuzzi California 1400
Joined: UTC
Posts: 1675
Location: SF Bay/Roseville CA
UTC quote
Another vote for fuel injector. I suggest you physically check it.

I had the same thing going, and it only got worse as the electrical connections on it deteriorated due to flexing and vibrations.

Here's a link to a picture of it.
Hiccups/ Hesitation/ and free lift to the office.

Steve..
DoubleGood Design banner

Modern Vespa is the premier site for modern Vespa and Piaggio scooters. Vespa GTS300, GTS250, GTV, GT200, LX150, LXS, ET4, ET2, MP3, Fuoco, Elettrica and more.

Buy Me A Coffee
 

Shop on Amazon with Modern Vespa

Modern Vespa is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com


All Content Copyright 2005-2024 by Modern Vespa.
All Rights Reserved.


[ Time: 0.0124s ][ Queries: 3 (0.0069s) ][ live ][ 313 ][ ThingOne ]