OP
UTC

Member
MP3 500 2012
Joined: UTC
Posts: 5
Location: Halstead essex
 
Member
MP3 500 2012
Joined: UTC
Posts: 5
Location: Halstead essex
UTC quote
Engine management lights up when riding? When I come to a stop ignition cuts out ? Can restart but as soon as I stop happens again ?
Turn of engine off with key and restart works fine until engine management light comes on ?

Any ideas?
@jimc avatar
UTC

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: UTC
Posts: 43462
Location: Pleasant Hill, CA
 
Moderaptor
@jimc avatar
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: UTC
Posts: 43462
Location: Pleasant Hill, CA
UTC quote
Check the voltage at the battery when you rev it a bit - if it goes above 14.6V (going above 15V is a real tell) then your regulator has shorted out. This is not uncommon, and the CEL coming on when accelerating is a prime clue for this fault.

Also get the battery tested, as over-voltage will rapidly bring on battery death.
OP
UTC

Member
MP3 500 2012
Joined: UTC
Posts: 5
Location: Halstead essex
 
Member
MP3 500 2012
Joined: UTC
Posts: 5
Location: Halstead essex
UTC quote
Thanks will do
OP
UTC

Member
MP3 500 2012
Joined: UTC
Posts: 5
Location: Halstead essex
 
Member
MP3 500 2012
Joined: UTC
Posts: 5
Location: Halstead essex
UTC quote
Hi jimc

Check battery reading idle 12.34v slight rev max going to 14.2v ?

Would this still be the regulator?
UTC

Molto Verboso
2015 MP3 500 ie Business
Joined: UTC
Posts: 1105
Location: Belgium
 
Molto Verboso
2015 MP3 500 ie Business
Joined: UTC
Posts: 1105
Location: Belgium
UTC quote
Seems like the regulator is working fine. If anything, output especially at idle is on the (very) low end bordering undercharging.

Next suspect is oxygen sensor. What type of fuel do you use and how often is the bike driven & for how long?

A bike that is only used for very short trips may never get the chance to fully charge the battery, which is why I always recommend a smart charger such as a Optimate 4 for any bike.
OP
UTC

Member
MP3 500 2012
Joined: UTC
Posts: 5
Location: Halstead essex
 
Member
MP3 500 2012
Joined: UTC
Posts: 5
Location: Halstead essex
UTC quote
Use unleaded petrol , travel daily to work 3 hours riding there and back around 120 miles a day. Work in London
UTC

Molto Verboso
2015 MP3 500 ie Business
Joined: UTC
Posts: 1105
Location: Belgium
 
Molto Verboso
2015 MP3 500 ie Business
Joined: UTC
Posts: 1105
Location: Belgium
UTC quote
How many miles or kms on the bike? And has the battery been load tested? Ditto on battery age. A static voltage reading is pretty much meaningless.
UTC

Hooked
Aprilia Mojito 125
Joined: UTC
Posts: 474
Location: Chelyabinsk, Russia
 
Hooked
Aprilia Mojito 125
Joined: UTC
Posts: 474
Location: Chelyabinsk, Russia
UTC quote
Could be oxygen sensor. Its readings are used only within specific RPMs, so maybe it is not checked on idle.
@steelbytes avatar
UTC

Veni, Vidi, Posti
2019 GTS300 Supertech E3 58,000km
Joined: UTC
Posts: 5233
Location: Batmania aka Melbourne, Australia
 
Veni, Vidi, Posti
@steelbytes avatar
2019 GTS300 Supertech E3 58,000km
Joined: UTC
Posts: 5233
Location: Batmania aka Melbourne, Australia
UTC quote
Jah wrote:
Could be oxygen sensor. Its readings are used only within specific RPMs, so maybe it is not checked on idle.
the o2 sensor is used during mid to low rpm including idle. it's not used at high rpm.
@steelbytes avatar
UTC

Veni, Vidi, Posti
2019 GTS300 Supertech E3 58,000km
Joined: UTC
Posts: 5233
Location: Batmania aka Melbourne, Australia
 
Veni, Vidi, Posti
@steelbytes avatar
2019 GTS300 Supertech E3 58,000km
Joined: UTC
Posts: 5233
Location: Batmania aka Melbourne, Australia
UTC quote
Zombiejoe wrote:
Use unleaded petrol
what RON? 91,95,98,E10, ...
Zombiejoe wrote:
Check battery reading idle 12.34v slight rev max going to 14.2v ?
does the 12.34 remain at that when idling for a few minutes? or does it creep up to 14?
@jimc avatar
UTC

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: UTC
Posts: 43462
Location: Pleasant Hill, CA
 
Moderaptor
@jimc avatar
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: UTC
Posts: 43462
Location: Pleasant Hill, CA
UTC quote
Zombiejoe wrote:
Hi jimc

Check battery reading idle 12.34v slight rev max going to 14.2v ?

Would this still be the regulator?
Slight rev no use. Rev to at least 3,000 rpm.
@steelbytes avatar
UTC

Veni, Vidi, Posti
2019 GTS300 Supertech E3 58,000km
Joined: UTC
Posts: 5233
Location: Batmania aka Melbourne, Australia
 
Veni, Vidi, Posti
@steelbytes avatar
2019 GTS300 Supertech E3 58,000km
Joined: UTC
Posts: 5233
Location: Batmania aka Melbourne, Australia
UTC quote
jimc wrote:
Slight rev no use. Rev to at least 3,000 rpm.
my HPE holds 14 while idling at 1700-ish. although iirc it does take several seconds after first start in the morning to reach that
⚠️ Last edited by SteelBytes on UTC; edited 1 time
@jimc avatar
UTC

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: UTC
Posts: 43462
Location: Pleasant Hill, CA
 
Moderaptor
@jimc avatar
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: UTC
Posts: 43462
Location: Pleasant Hill, CA
UTC quote
My old Fuoco needed higher revs than that. You can't assume that an HPE's system is similar to an older 500.
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: 0.0226s ][ Queries: 3 (0.0016s) ][ Debug on ][ 313 ][ Thing One ]