Forum -> General Discussion
Search Topic
vespa gts 300 2008 plate
OP
joshua
UTC
Lurker
vespa gts300
Joined: UTC
Posts: 1
Location: shoreham by sea
 
joshua
Lurker
vespa gts300
Joined: UTC
Posts: 1
Location: shoreham by sea
UTC quote
hi guys and girls was wondering if anyone can give me some help my check engine light comes on after riding for about 5 mins and doesnt go away untill u turn bike off i checked most things but unsure now what could be
@jimc avatar
jimc
UTC
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: UTC
Posts: 44687
Location: Pleasant Hill, CA
 
jimc
Moderaptor
@jimc avatar
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: UTC
Posts: 44687
Location: Pleasant Hill, CA
UTC quote
Very likely it's your regulator.

Take your multimeter with you (if you don't have one, get a cheap £10 one) next time you're out. When the CEL comes on, stop and measure the voltage across the battery while revving the engine. If 15V or over (often 17V in this scenario) then your regulator is definitely shot, and needs replacing ASAP before it ruins your battery as well.

More here:
Diagnosing Charging System Problems

Note Piaggio reckons 15.2V is OK - is is NOT. Normally you should see no more than 14.4V, but 14.6V is acceptable. Any more and your battery is being over-charged and will die in short order.
Post Reply
Forum -> General Discussion

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.

Modern Vespa is made possible by our generous supporters.

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 2005-2025 by Modern Vespa.
All Rights Reserved.

[ Time: 0.3512s ][ Queries: 4 (0.3444s) ][ live ][ 334 ][ ThingOne ]