2016 mp3 300 lt engine cuts out on 100kmh
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Lurker
mp3 300 lt 2016
Joined: 14 Jul 2020
Posts: 2
Location: israel
Tue Jul 14, 2020 2:17 am quote
Hey Guys
I just got a 2016 mp3 300cc LT with only 10,000 km.
After replacing the oil and water i hit the freeway and suddenly lose power (while driving 100-110 km/h).
engine has turned off.
i let it rest for 4-5 minutes and start it again, it starts and i drive back home.
Since then it happen to me 4-5 times in varying frequency (once a week on once a month).
any ideas ?

thanks in advance.
Member
mp3 500 2018 (USA-version)
Joined: 21 Apr 2020
Posts: 12
Location: Belarus, Minsk
Tue Jul 14, 2020 6:55 am quote
1. The problem is electrical. Lack of spark. 2. Lack of fuel. A possible problem is in the fuel pump .... What is the air temperature when a stop occurs? 3. Thermal damage to the piston. Unlikely. Not excluded.

4-5 minutes to not start?
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 38715
Location: Pleasant Hill, CA
Tue Jul 14, 2020 7:25 am quote
Possibly a heat related failure? Try some freezer spray on the ECU, or coil next time.
Enthusiast
2013 MP3 300ie
Joined: 24 Nov 2017
Posts: 70
Location: Netherlands
Wed Jul 15, 2020 11:09 am quote
Re: 2016 mp3 300 lt engine cuts out on 100kmh
gaigo wrote:
Hey Guys
--
After replacing the oil and water
--
thanks in advance.
Did you bleed the air from the cylinder head after replacing coolant?
Lurker
mp3 300 lt 2016
Joined: 14 Jul 2020
Posts: 2
Location: israel
Mon Jul 20, 2020 10:55 pm quote
4-5 minutes.
Bylead wrote:
1. The problem is electrical. Lack of spark. 2. Lack of fuel. A possible problem is in the fuel pump .... What is the air temperature when a stop occurs? 3. Thermal damage to the piston. Unlikely. Not excluded.

4-5 minutes to not start?
true. 4-5 minutes.
the air temperature here is high - about 30C.
right after it cuts off i still have power, lights are on and i can lock the front suspension as it get slow.
might be a fuel pump problem or lack of spark but then why can't i start the engine right away....
Hooked
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 241
Location: Belgium
Tue Jul 21, 2020 2:09 am quote
Was the coolant replaced/renewed at some point, and if so was the bleeder valve on the cylinder head used?

These engines do not self bleed and if a coolant service was performed without bleeding manually, you will have a pocket of air inside the cylinder head that will give you similar issues when the engine reaches higher revs for prolonged stretches
Enthusiast
2013 MP3 300ie
Joined: 24 Nov 2017
Posts: 70
Location: Netherlands
Tue Jul 21, 2020 2:49 am quote
Re: 2016 mp3 300 lt engine cuts out on 100kmh
gaigo wrote:
Hey Guys
I just got a 2016 mp3 300cc LT with only 10,000 km.
After replacing the oil and water i hit the freeway and suddenly lose power (while driving 100-110 km/h).
engine has turned off.
i let it rest for 4-5 minutes and start it again, it starts and i drive back home.
Since then it happen to me 4-5 times in varying frequency (once a week on once a month).
any ideas ?

thanks in advance.
That was my first thought also...
Veni, Vidi, Posti
Neutrino MP3 492.7 AK, 2013 Moto Guzzi Norge
Joined: 29 Mar 2008
Posts: 21619
Location: Harriman, Tennessee, Tn
Tue Jul 21, 2020 7:01 am quote
sounds like vapor locking. do a test ride and when it happens open the gas cap and if you hear a big woos of air you have a venting issue. Also if that happens you should be able to restart the scoot again right away.
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