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Motorcycle cutting out when engine gets hot

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ARS125
Two Stroke Sniffer



Joined: 02 Aug 2017
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PostPosted: 18:34 - 05 Aug 2017    Post subject: Motorcycle cutting out when engine gets hot Reply with quote
Aprilia RS 125 derestricted.

Spark plug blown so i fitted a B9EG plug (it was all Halfords had in stock).

Took it out for a 40 or so mile ride today and i had to pull over and let the engine cool several times.

At approximately 65-68c the engine cuts out and loses all power. Once it cools to 60c or below it starts again normally.

Is this caused because i should really have the B10 spark plug in the derestricted bike? I know that the 2 stokes shouldn't be run too hot but you can take them a fair bit over 70c usually right?

Bike is running lean as its only got 100 miles on the new engine. Maybe less.

As a side note, my hearing is absolutely fucked. Is this common with the RS 125? in the search for a noise isolating helmet Shocked
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Copycat73
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PostPosted: 18:57 - 05 Aug 2017    Post subject: Reply with quote
what plug does the hand book say ?
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ARS125
Two Stroke Sniffer



Joined: 02 Aug 2017
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PostPosted: 19:37 - 05 Aug 2017    Post subject: Reply with quote
Copycat73 wrote:
what plug does the hand book say ?


B9EG - restricted RS125
B10EG - derestricted RS125

I have the B9EG in the desrestricted RS.

Its weird. Bike runs spot on until it gets to 68+ then it cuts out. Soon as the temperature drops the engine starts first time again.

Power value kicks in as it should at about 8k revs.
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Copycat73
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PostPosted: 07:04 - 06 Aug 2017    Post subject: Reply with quote
ARS125 wrote:
Copycat73 wrote:
what plug does the hand book say ?

B10EG - derestricted RS125
I have the B9EG in the desrestricted RS.


go to a big motorbike dealer and buy B10EG .. don`t buy of evil-bay or any other sh1t on-line .. if you must buy on-line use https://www.wemoto.com/
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Pete.
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PostPosted: 10:16 - 06 Aug 2017    Post subject: Reply with quote
The 10 plug is slightly colder than the 9 you are using which means it will transfer heat away from the electrode a bit faster. That's why the de-restricted bike needs the next number up.

It's got nothing to do with the engine over-heating. Most probably that is due to running lean, not something you want to do on that bike.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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ARS125
Two Stroke Sniffer



Joined: 02 Aug 2017
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PostPosted: 10:19 - 06 Aug 2017    Post subject: Reply with quote
Copycat73 wrote:

go to a big motorbike dealer and buy B10EG .. don`t buy of evil-bay or any other sh1t on-line .. if you must buy on-line use https://www.wemoto.com/


Already have a B10EG ordered in at my local garage. Ordered it in the same day as i fitted the B9EG, the garage just takes fucking ages to get parts in. Hopefully ready for this afternoon.

My thought is that the B9EG is a cooler spark plug and hence fails to work at the higher temperatures that the derestricted RS reaches. So with a bit of luck the new plug will sort it.

Gonna have a look for corroded or loose wires today because my headlights stopped working. My main beam flash lights work but not using the switch.

I'm not very mechanically inclined but the RS gets you learning quick Laughing
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Copycat73
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PostPosted: 13:17 - 06 Aug 2017    Post subject: Reply with quote
ARS125 wrote:

I'm not very mechanically inclined but the RS gets you learning quick Laughing


I am correct in assuming that...
the engine is a four-stroke liquid cooled single cylinder with electronic injection and 4 valves. Euro 4
with a Double overhead camshaft - DOHC

assuming this is the case and it is NOT a 2 stroke example .. since I`m not knowing what the year of manufacture is..

what is the current millage ?

and when was the last time the valve clearances was done ?
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cb1rocket
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Joined: 30 Jan 2010
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PostPosted: 13:22 - 06 Aug 2017    Post subject: Reply with quote
Copycat73 wrote:
ARS125 wrote:

I'm not very mechanically inclined but the RS gets you learning quick Laughing


I am correct in assuming that...
the engine is a four-stroke liquid cooled single cylinder with electronic injection and 4 valves. Euro 4
with a Double overhead camshaft - DOHC

assuming this is the case and it is NOT a 2 stroke example .. since I`m not knowing what the year of manufacture is..

what is the current millage ?

and when was the last time the valve clearances was done ?


It's a 2 stroke, 4 stroke don't have power valves
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smegballs
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Joined: 28 Oct 2007
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PostPosted: 13:36 - 06 Aug 2017    Post subject: Reply with quote
ARS125 wrote:
Aprilia RS 125 derestricted.


Copycat73 wrote:

I am correct in assuming that...
the engine is a four-stroke liquid cooled single cylinder with electronic injection and 4 valves. Euro 4
with a Double overhead camshaft - DOHC


https://2static.fjcdn.com/pictures/What_1ce6d2_6050699.jpg
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Copycat73
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PostPosted: 13:48 - 06 Aug 2017    Post subject: Reply with quote
cb1rocket wrote:

It's a 2 stroke, 4 stroke don't have power valves


0oops Laughing

had forgotten about them ... whats this power band ... do they come in different colours Rolling Eyes

PS.. the 2017 model is a four stroke item...
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smegballs
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PostPosted: 14:03 - 06 Aug 2017    Post subject: Reply with quote
Copycat73 wrote:

PS.. the 2017 model is a four stroke item...


Sick

Now that is real heresy. Should have had the decency to retire the line and launch a new model...
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Copycat73
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PostPosted: 14:08 - 06 Aug 2017    Post subject: Reply with quote
smegballs wrote:
Copycat73 wrote:

PS.. the 2017 model is a four stroke item...

Sick
Now that is real heresy. Should have had the decency to retire the line and launch a new model...


no need .. all the competition is four stroke now ...

unless you want a scooter ... well that's what google says .. personally I`ve never looked at a 125 for over 18 years Neutral
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ThatDippyTwat
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PostPosted: 14:29 - 06 Aug 2017    Post subject: Reply with quote
Copycat73 wrote:
PS.. the 2017 model is a four stroke item...


That's the RS4, not the RS. 15BHP, same lump is in a few bikes.
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Copycat73
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PostPosted: 15:00 - 06 Aug 2017    Post subject: Reply with quote
ThatDippyTwat wrote:
Copycat73 wrote:
PS.. the 2017 model is a four stroke item...


That's the RS4, not the RS. 15BHP, same lump is in a few bikes.


oh I give up Doh!

..... gonna look at Africa twins on the net.com. now

PS.. check the compression on that 125 ....
could be lookin at rings and maybe a re-bore... won`t know till you lift the head & block off..
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Pete.
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PostPosted: 15:21 - 06 Aug 2017    Post subject: Reply with quote
Copycat73 wrote:


oh I give up Doh!



Thank fuck for that.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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Rogerborg
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Joined: 26 Oct 2010
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PostPosted: 17:02 - 06 Aug 2017    Post subject: Reply with quote
The way I'd like to see this arcane issue addressed is with a picture of the bike plus a tin of custard.
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ARS125
Two Stroke Sniffer



Joined: 02 Aug 2017
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PostPosted: 21:27 - 06 Aug 2017    Post subject: Reply with quote
Pete. wrote:
The 10 plug is slightly colder than the 9 you are using which means it will transfer heat away from the electrode a bit faster. That's why the de-restricted bike needs the next number up.

It's got nothing to do with the engine over-heating. Most probably that is due to running lean, not something you want to do on that bike.


Its had a new engine fitted with less than 100 miles on. According to the previous owner its good to run them in lean?

So the bike cutting out at higher temperatures has nothing to do with the plugs?

Copycat73 wrote:


PS.. check the compression on that 125 ....
could be lookin at rings and maybe a re-bore... won`t know till you lift the head & block off..


Compression should be fine being a new engine?

Last edited by ARS125 on 21:30 - 06 Aug 2017; edited 1 time in total
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ARS125
Two Stroke Sniffer



Joined: 02 Aug 2017
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PostPosted: 21:28 - 06 Aug 2017    Post subject: Reply with quote
Rogerborg wrote:
The way I'd like to see this arcane issue addressed is with a picture of the bike plus a tin of custard.


Did you just say a tin of CUSTARD? Shocked please explain why i would upload a tin of custard? lol.

But sure, if you want some pics i will upload them in the morning, its a little dark and the headlights ain't working Rolling Eyes
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Pete.
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PostPosted: 22:16 - 06 Aug 2017    Post subject: Reply with quote
ARS125 wrote:

Its had a new engine fitted with less than 100 miles on. According to the previous owner its good to run them in lean?


No of course it's not good to run an engine in lean. Lean running produces higher temperatures, the exact opposite of what you want. Until the parts have bedded in you need to keep the engine temperatures down.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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