Honda FES S Wing idle fault problem

[nath.burgess]

Hello all.
New to the forum as I am in need of help.
I have just bought a 2007 Honda S Wing 125cc. 30,000 miles.
The problem I am having is the bike is cutting out at traffic lights and when I come to a stop.
The bike starts easily on the button and accelerates and pulls well when moving but seems to be missing sparks or starving of fuel at tick over leading to a rough idle and instant or sometimes delayed stalling.
Bike will fire up again on button after it has stalled.
Air Filter looks good. New Spark plug, Battery, oil and fresh fuel. bike has full Honda service history regular at 2,500 miles.
Any ideas or preferably someone who has encountered same problem
all help will be appreciated.
Many Thanks, Nathan.

[bikenut]

:D hi nathan, i think there was a dide on here some time ago ( 2 months?? ) he was having simnilar problems form memory and had a fault light come up..............his was sunnfering from an oil leak whichm may have n=been coming up a sensor wire and causing problems where the multi wired connector block goers into the ecu unit......scroll down ans have a look see...........
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nuts about bikes

[funtomino]

Hi,
got an s wing 150, and got the same problem. Stall
Could not find dode post.

Same symptom:
The bike starts easily on the button and accelerates and pulls well when moving but seems to be missing sparks or starving of fuel at tick over leading to a rough idle and instant or sometimes delayed stalling

Cutting of at stop or on lights.

Replaced sparkplug,
fuel filter cleaned (in tank)
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S-Wing 150

[cb1rocket]

Check the wiring near the ecu. Had this problem on a friends s wing. Check for any shafted wiring, melted wires etc
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Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852

[funtomino]

thanks for reply, where is it located please?
Is it behind the headlights?

After that was your friends bike running again like new?

Thanks for re.
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S-Wing 150

[cb1rocket]

its under the seat, check around the throttle body ecu area
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Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852

[funtomino]

Thanks a lot cb1rocket .

I've found it, on throttle body big connector with many wires. I unplugged it and sprayed it in and and out with wd40. No cables seemed to be damaged or rotten.

I cleaned yesterday every single connector that I've found, there was some oxidation on relays, some connectors, oxidation on earth cable as well. Tried to get rid of it.

I try to start it up today and see how it runs.
It is a pain in the a.. to take down the plastics on the s-wing.
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S-Wing 150

[funtomino]

[funtomino]

[fesanand]

My experience with the Honda S-wing (FES) is slightly different, but is worth to mention.

Many problems like stopping at idle or serious trouble to start up, specially with cold/wet weather.

Checked all electric, battery, spark plug and cable, main relay etc...
Checked and cleaned the air filter and its box.
Only left the throttle body connection underneath the luggage box.


Before proceding to the thorttle body work (seat + luggage box to be removed) and as I was in maintanence mood, I decided to buy a new air filter, to my surprise all problems sorted, starts perfectly and doesn't stop at idle even in cold weather. Apparently needs the filter box to help also the two breather tubes.

The honda is different to my previous bike, the Honda needs new filter the previous bike only needed some filter suction cleaning with a vacuum cleaner.