Modern Vespa

please help i have a piaggio fly 125. will not start it has two broken wires going into the carb. one wire has broken off inside the plug and carnt be connected.
can any one tell me what this is and is there any way to repair or bypass it

What colours are the wires?

If they go to the carb they would be the autochoke or the carb heater I guess....

thanks autochoke and carb heater are connected think this must be a throttle sensor or maybe airflow.
wires are black, green and black, green and red

Your right it's the TPS throttle possition sensor but it should still start up and run without it just helps with spark advancing. Wire will need soldering on I guess

Sadly we don't have a wiring diagram for the Fly 125 available, though we do have the workshop manual - in which the wiring colours are unreadable.

http://manuals.wotmeworry.org.uk/More%20Manuals/Piaggio/

Hopefully someone with a Fly 125 (or Fly 150) can identify this for you.

My bet is the carb heater, which is separately wired from the auto-choke - though it looks like both only have two wires going to them according to the crappy diagram in the workshop manual.

My guess was that it was the carb heater due to the colour of the green/black wire in the photo, I couldn't tell the exact colour though as it looked a bit brownish too...

Here is a wiring diagram for a Fly, (Leader) Liberty and B125. It doesn't shed any light on the Green/with trace, coloured wires in relation to the carb heater though. The carb heater is fed from the ign switch the same as the choke. The Orange colour does have a trace colour in my big pic, but it is hard to make out.
The Green/Black wire appears to come from the starter switch to the starter relay.
If there was a way to upload the big pic, I would.

http://pscgroup.square7.ch/Manuals/Piaggio%20X/circuits/Fly%20125%20Liberty%20125%20&%20B125%20models.jpg

Hang on - the Fly and LT are air-cooled, while the B125 is definitely water-cooled. So I think Haynes got that wrong...

I don't doubt it. The following is an ET4 Haynes effort. Apparently an ET4 doesn't have an oil pressure switch.
http://pscgroup.square7.ch/Manuals/Piaggio%20X/circuits/ET4%20125%20model.jpg

Just out of interest - did we manage to work out what this was?

hi, I do have the same problem as you, just different model. green and black striped wire is live to ignition, and so is the brown and green striped wire. there should be two other wires , mine are solid blue and green..I am trying to figure out if blue and brown and green go to choke or carb heater. my bike starts but runs poorly but in winter runs very well, so I am thinking I have connected the choke to the the carb heater wires which I think are geen and green and brown striped. I am going to switch these around to the blue and green and black striped wires and see if that fixes my issue. note if these wires are connected the wrong way around then your ignition coil may be affected too. I am running very rich and only takes a few miles before the spark plug fouls to a black sooty looking plug instead of a nice tan brown looking one. hope this helps, have a great ride once sorted. I know this is an old thread, but thought I would share my findings, its not even my bike, just fixing for my brother.

me a, your I think and dont bombard me with ignorance if this is wrong, but the red and green traced wire should go to carb heater which is live and the green and black traced wire goes to auto choke live wire. the other two wires are just ground wires so should not really matter which other two wires they connect to. carb heater and auto choke are not polarity sensitive, as they have a resistor and will always show continuity when tested with a multi meter As I have mentioned my 2 ground wires from carb heater and choke are blue and green, yours might be black or something else, but if you have not already tried, you could leave the carb heater disconnected, as it only plays a role in really cold climates. I am trying green and black traced wire and blue solid wire which connect to choke green solid and yellow solid wires, does not matter about which way you wire these together green to blue and yellow to green and black traced wire... I will leave now as my cat needs feeding, all the best, and it would be nice to hear from others on this forum...sorry for any errors in typing,as my keyboard is in need of replacement....