Modern Vespa

Hi
I have a lx 125ie engine. Is it possible to remove the injection block and replace it with a carburettor?
I know the Fuel injection system is more fuel efficient but i like carburettors.
Also what upgrade cylinders will fit the lx. Is the only option the mallossi 190 kit?

Robbie

Well... The kits for the carb and the ie models are identical and if I remember rightly the leader engine is practically all the same with the edition of fuel injection. I imagine it would be possible but wouldn't you run into problems with the ecu being confused with the lack of fuel injection controlling the system? As you have things like the lambda sensor ect that all speaks to the fuel injection...

I'm no expert or anything, just seems logical that you'd have to swap out a bit more than just the injection system.

Also on the kit side of things, it would depend what head you have, there 125ie engines come in both 2v and 3v set ups, it would depend what head you have to what kit you can install. What head do you have?

Hi
Thanks for the reply.
I have a batterd old et2. With no engine.
I do have a complete lx125 ie engine, wheel, exhaust and mounting bracket.
I figured i could put the lx engine in the et2. Put on a carb and new wiring loom and ecu.
No need for a fuel pump.
I need to buy an ecu anyway.
Or am i better off just buying a fuel pump to feed the injectors? And wiring loom and ecu for a injected lx?

The engine code is m681m.
Would this be a euro 3....2 valve injected engine?

Yes that's the 2v head if I'm not mistaken, and if I was you id set the bike up for the fuel injection as you can keep all the various sensors that come with the injection...but thinking about I don't think there's that many.. its very possible to set it up for carb use if you feel up to it! Injection sounds like you'd be on the road quicker if that matters at all. Just make sure that if you go down the carb side of things the parts that speak to the ecu, like the auto choke ect, cross match to the older models part numbers to ensure that they will speak to the new ecu.

Kit wise, you have the choice between the molassi or you can but the piaggio 200cc head on... I'll double check to make sure. You get better compression with the molassi kit so it is the more torqy of the two.


Good luck with the project!

Thank you, Once again for the reply.
How does the injection system work, does it need a throttle cable.
Can any fuel pump be used?

Yes there's a throttle cable used and on the fuel pump side of things I think (though I'm now starting to go out my depth here) but id go with the piaggio one to make sure its compatible with the new ecu and wiring looms. Also you'd know you have the right pressure flowing to your injection system. Be careful buying these second hand, there was a recall and you may get a defective one so best to try and buy new with these to avoid issues.

I assume the et's frame is similar enough to the lx's to be able to house the fuel pump? I'll find you a diagram out of the positioning of the pump in the lx and a diagram of the space available in the et if it makes it easier working out the creases?

Oooh remember you need to account for the oil tank and possibly remove it all together out of the old et's frame as it is a two stroke. Will be taking up some room and its no longer needed.

Would i be right in thinking the following

The stator plate/ generator on a lx 125 ie will be the same as on the vespa et4 or vespa lx, which both use carbs. The connector blocks will be the same?
If i loose the injector block and source a carb i can use a different wiring loom/harness.
Et4 harness and cdi/ immobiliser and keys.

Robbie