Modern Vespa

the threaded hole is for the carb heater. it should be flopping around there somewhere. the upper hole is nothing. the A/F mix is that little D-shaped brass one.

when you do the A/F mix, don't lose the tiny spring/washer/o-ring your you're up the creek.

the clamp on that one hose is off, make sure that is secured properly and you don't have a leak there.

the packing for the shroud is all askew. so somebody's been in there before.

also, if you're doing all of this in the bike without removing the carb-- don't.
1- you'll never get it sufficiently clean or do a proper job
2- that's a great way to lose something right into the abyss of the engine area
3- you risk dropping something into the intake.

anyway, my money is still on the the carb.

could be on the fritz, a loose connection or a chip starting to go out. impossible to diagnose without riding it in person, really.

If it's the carb, and it didn't rev up with ether, I would look at the slide. That's got to move to allow more gas in.

Your right, and I'm asking my coworker when I go in if he can give me a lift.
The regular place that's serviced it is backed up 2 weeks, but there's another Vespa shop across town I can get it in earlier-

I'm gonna give it one more go tomorrow with that mixture screw, the sun's getting low, and I need a nap before work.

I can't thank you guys enough for your help!!

bound spring on the diaphragm would do that, but it'd be damn near unrideable.

maybe the pick up on the stator is slowly going away.

but I'm still thinking carb

It's definetly unrideable- not enough power to even move. Gun it and she sits doing that bog.

If I remember correctly, on the ET4, the top outlet in the fuel valve connects via a hose to the carb, and the bottom one goes to the vacuum outlet on the intake manifold.
Where is the T connector that was replaced?

on the LX the T is in line with the vacuum hose and goes off to the SAS gulp valve.

if he had connected it any other way it would not run at all. or, it's very very unlikely that it would run at all.

here's the sticking point: somebody was already in there. you went in there and copied what you saw so who's to know if what they did initially was correct?

it's difficult to diagnose a problem when people have different skill sets and different ideas of what "clean the carb" means.

for instance, you replaced the petcock. so I know you had to drain the fuel to do so. did you throw that fuel out or did you put it back into the machine? could that fuel have initially been contaminated and that's partially the problem? absolutely.

so, I don't know if you put the carb back together right because you put it back together how you saw it come apart. which leads me to the believe that it's carb or fuel related.

but, I'd put a side wager on the immobilizer as well.

What other Vespa shop? I ask as the shops in Milwaukie and Hillsboro both closed a couple of years ago, leaving us (as far as I know) with one with expertise in modern Vespas..

Oh I got rid of that gas, and got fresh...and I agree; I just mimicked...but I put 200 miles on it since I got it; and when it cut out suddenly, it perplexed me...it ran totally fine up until then.

Hopefully they can figure it out at the shop, and I'll write down all points discussed here..I'm not at ALL used to dealing with those transponders or any of that stuff. I'm used to your basic gas, spark, air, GO.

It'll get figured out. I'm just neurotic

Portland Vespa has done all the work, but they're backed up 2 weeks-
There's also Sabitino Scooters over in St.Johns, I called them and they can check it out this week. I'd rather go with P.V, since they've got the complete history of the bike, same aspect, it's my only.form of transpo other than a fixie.

Unrelated, but I have found a way out of this particular hole.

I wasn't aware that Sabatino's worked on modern Vespas. They are an independent classic scooter shop that works on mopeds and classic 2T scooters. I suppose they have some expertise that could help you out.

God willing- I just got this LX a month ago and good weather is approaching.

Did you try it with the gas cap off?

Yep.

You think I should get one of those and repack it, maybe?
And looking at that funky air/fuel mix screw, I wonder if the dealer would have one for sale- I'm sure they would.

the D-shaped idle screw is stock and comes on many type of bikes and carbs.

you only need one if you've lost or damaged yours. same as the o-ring and little washer and spring.

Late to the party and just saw this post. If I was in Portland and couldn't get into Vespa shop I would go to Slabtown cycles first and Sabatinos only as my LAST choice. This is from experience and close others experiences...

This forum and Vespa shops only for me.

This has to be carb related

Recheck the bottom of the intake

What year is the lx?

With so many differences between model years, how lovely when members indicate the model year of their scooters right next to the model listed beneath their name.