Modern Vespa

Molto Verboso

lx 50

Joined: UTC
Posts: 1060
Location: Brighton

northernerbill

Molto Verboso

lx 50

Joined: UTC
Posts: 1060
Location: Brighton

UTC quote

Sorry dude but does that mean you've put the original carb back?

Any new carb will NOT work out the box.

I'm slowly steering towards you taking it to a Vespa mechanic to be honest.

1, use only the original carb, 99% sure nothings wrong with it.
2, your choke melted it's cover, that does need replacement.
3, Did you check the throttle cable I mentioned as it enters the carb, the U bend bit above the carb.....have you got it directed towards where the cable naturally comes from. If it's forced round at an angle it could bind and cause open throttle

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Addicted

2006 LX 50

Joined: UTC
Posts: 528
Location: Warren MI

Addicted

2006 LX 50

Joined: UTC
Posts: 528
Location: Warren MI

UTC quote

traveler wrote:

OK Since last visit. I have changed out the carburetor. It took quite a while to get it going. I sprayed carb. cleaner in the intakes. The battery died. I recharged it, and repeated the process. Finally started running. Problem is - It starts right up, but immediately idles at practically full or Red line RPM. I'm concerned I'm going to blow up the engine. I've done this 5 or more times. I think long enough to burn off the carb cleaner used as the jump start. I'm thinking linkage? Not sure how to loosen or reduce flow by way of adjusting those two nuts at the end of the throttle cable. I loosened the idle screw. Didn't help

Thanks in advance,

Traveler (Worst mechanic in the history of mechanics)

Now that definitely sounds like the gas valve is not in properly. For the engine to run at that high of an RPM the throttle is not fully closed.

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Enthusiast

1969 Sprint 2011 LX50

Joined: UTC
Posts: 90
Location: Hawaii

Enthusiast

1969 Sprint 2011 LX50

Joined: UTC
Posts: 90
Location: Hawaii

UTC quote

OK Baby steps, but there is some progress.

I connected the throttle cable around that stud on the bottom of the pulley thing. That gave it the additional tension to rev high. I corrected that. The New carburetor is working great. 10-12 mph faster. ( almost 34 on straightaways) So far so good. Take it for the 2 mile spin and it cuts out 2-3 times again. ( restarts after cooling for 7-8 minutes) I notice that the spark plug wire is really close to the hot part of the front engine. Does anyone think a hot electrical wire could cause these fits?

Thanks in advance,

Traveler

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Addicted

2006 LX 50

Joined: UTC
Posts: 528
Location: Warren MI

Addicted

2006 LX 50

Joined: UTC
Posts: 528
Location: Warren MI

UTC quote

traveler wrote:

That sounds exactly like a bad CDI. Where did you get the new CDI? It may be bad. If you still have your old one try a quick swap next time it dies to see if that corrects it.

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Enthusiast

1969 Sprint 2011 LX50

Joined: UTC
Posts: 90
Location: Hawaii

Enthusiast

1969 Sprint 2011 LX50

Joined: UTC
Posts: 90
Location: Hawaii

UTC quote

OK Making progress. Replaced CDI again with another. I also wrapped the plug wires in foil to insulate (probably had no effect, and wasn't the difference) Anyway, 5 miles without stalling on inclines and mixed grades. So Great!!! Thanks for all the help. I'm just down to one issue My headlight doesn't work. I think it was from when I was monkeying around trying to replace the spark plug. Maybe I dislocated another wire or something.

Any suggestions on a part I should look at and replace

Thanks in advance,

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Addicted

2006 LX 50

Joined: UTC
Posts: 528
Location: Warren MI

Addicted

2006 LX 50

Joined: UTC
Posts: 528
Location: Warren MI

UTC quote

traveler wrote:

My guess is it's either the voltage regulator (rectifier) or AC wiring between the regulator and headlamp.

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Motovista UTC details Veni, Vidi, Posti GT 200 Joined: UTC Posts: 9186 Location: Main Street, Watts
Motovista Veni, Vidi, Posti GT 200 Joined: UTC Posts: 9186 Location: Main Street, Watts	UTC quote or the bulb. If you don't have turn signals, it's usually the voltage regulator.

OP traveler UTC details Enthusiast 1969 Sprint 2011 LX50 Joined: UTC Posts: 90 Location: Hawaii
OP traveler Enthusiast 1969 Sprint 2011 LX50 Joined: UTC Posts: 90 Location: Hawaii	UTC quote I have the turn signals and break lights. Just No Headlight and no lighting on the instrument panel. It happened after changing out either the Spark Plug or CDI. Thanks in advance

FrankNBrew UTC details Addicted 2006 LX 50 Joined: UTC Posts: 528 Location: Warren MI
FrankNBrew Addicted 2006 LX 50 Joined: UTC Posts: 528 Location: Warren MI	UTC quote traveler wrote: I have the turn signals and break lights. Just No Headlight and no lighting on the instrument panel. It happened after changing out either the Spark Plug or CDI. Thanks in advance What about the running lights? Those are also on the AC circuit. Turn signals and brake light are DC.

OP traveler UTC details Enthusiast 1969 Sprint 2011 LX50 Joined: UTC Posts: 90 Location: Hawaii
OP traveler Enthusiast 1969 Sprint 2011 LX50 Joined: UTC Posts: 90 Location: Hawaii	UTC quote Hi FranknBrew The running lights do not work. So I don't have the Headlight, instrument panel light, and running lights. The turn signals, and Brake lights work. The last time I changed out the Voltage regulator, was because the turn signals did not work.

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2006 LX 50

Joined: UTC
Posts: 528
Location: Warren MI