Engine light turns on when riding Piaggio MP3 above 3000 rpm
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Lurker
Joined: 25 Aug 2020
Posts: 3

Tue Aug 25, 2020 1:58 am quote
I have a Piaggio MP3 2007 and I enjoy it very much. But the last time I was riding it, the engine light turns on (orange). I noticed that it happens when the engine is making more than 3000rpm and the light turns of at idle (below 2000 rpm).

What could be the issue here?
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50cc Beo, BigBeo
Joined: 30 May 2015
Posts: 270
Location: Chelyabinsk, Russia
Tue Aug 25, 2020 5:29 am quote
Just a guess: check voltage at battery at idle and over 3000.
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39119
Location: Pleasant Hill, CA
Tue Aug 25, 2020 4:51 pm quote
^^^^
Your voltage regulator has died.

Replace it.

If this has been happening for a week or more, consider replacing the battery as well, as this will have been stressed by >17V being presented to it.
Lurker
Joined: 25 Aug 2020
Posts: 3

Wed Aug 26, 2020 5:55 am quote
Thanks!

My voltage regulator does this:

At idle, it gives between 13 and 14 volts. When I throttle more, even a bit, it goes up to 18 volts.

I'm not familiar with this. Is such a high voltage wrong?

Is a voltage regulator replaceable myself?
Ossessionato
Gilera Fuoco 500ie
Joined: 11 Oct 2009
Posts: 4226
Location: Netherlands Olst
Wed Aug 26, 2020 5:57 am quote
regulator got them in stock
Hooked
Piaggio MP3 500
Joined: 21 Nov 2017
Posts: 296
Location: Austin, TX
Wed Aug 26, 2020 6:49 am quote
Yes, you just need to locate it and remove a body panel to get to it, then the new one just plugs into the harness. But do it soon- 18V is way too high and it's stressing all your electrics from the ECU's to the battery, and could end up being very expensive.
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39119
Location: Pleasant Hill, CA
Wed Aug 26, 2020 7:38 am quote
gwbonline wrote:
Thanks!

My voltage regulator does this:

At idle, it gives between 13 and 14 volts. When I throttle more, even a bit, it goes up to 18 volts.

I'm not familiar with this. Is such a high voltage wrong?
YES!
Quote:
Is a voltage regulator replaceable myself?
Yes.
Lurker
Joined: 25 Aug 2020
Posts: 3

Fri Aug 28, 2020 10:13 am quote
It was the voltage regulator. Replaced it with a second hand alternative and the engine light never turned on again. And the bike rides like a charm! Didn't know this makes such a difference.
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MP3 400 "Orion"
Joined: 01 Jul 2012
Posts: 937
Location: Northwest Ohio
Thu Sep 03, 2020 3:12 pm quote
I'm afraid this is what's happening with my machine. The symptoms sound exactly the same. Where do I find the regulator, what panels do I have to remove to get to it, and where's the best place to get a replacement?
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39119
Location: Pleasant Hill, CA
Thu Sep 03, 2020 3:24 pm quote
Carolan wrote:
I'm afraid this is what's happening with my machine. The symptoms sound exactly the same. Where do I find the regulator, what panels do I have to remove to get to it, and where's the best place to get a replacement?
You can lead a horse to water...

Page 57 of the workshop manual:
https://manuals.wotmeworry.org.uk/Piaggio/Piaggio%20MP3/MP3%20400/

https://scooterpartsco.com/ricambi/080-oem/oem-voltage-regulator-for-vespa-250-300-piaggio-aprilia

mp3400-regulator.jpg

Addicted
MP3 400 "Orion"
Joined: 01 Jul 2012
Posts: 937
Location: Northwest Ohio
Thu Sep 03, 2020 3:34 pm quote
Thank you.
jimc wrote:
Carolan wrote:
I'm afraid this is what's happening with my machine. The symptoms sound exactly the same. Where do I find the regulator, what panels do I have to remove to get to it, and where's the best place to get a replacement?
You can lead a horse to water...

Page 57 of the workshop manual:
https://manuals.wotmeworry.org.uk/Piaggio/Piaggio%20MP3/MP3%20400/

https://scooterpartsco.com/ricambi/080-oem/oem-voltage-regulator-for-vespa-250-300-piaggio-aprilia
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