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Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
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Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
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I've been riding my PX150E several years with many miles with no problems. When I was cleaning it the other day I noticed something I'd never noticed before. The cdi unit has the remnants of what looks like where a wire had been cut off. It has the HT cable and four plug in wires but a wire coming out of the plastic had been cut. On the new cdi units I see a yellow or gray wire in this place. It is a stock, 12 volt system without battery, with turn signals. Everything electrical works fine.

Why would this wire have been cut off? What was it for? The bike has run great and runs great now.
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Molto Verboso
Scattered remnants of (two!) 1974 Rallys
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Molto Verboso
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That's a ground wire. It might have just broken off.

The CDI can operate without it. It's apparently a fail safe or something. I have one that's the same, and the wire isn't long enough to splice.
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Molto Verboso
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Molto Verboso
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That's a ground wire. It might have just broken off.

The wire would have connected to one of the screws on the fan shroud, but the original wiring on those gets brittle over time.

The CDI can operate without it. It's apparently a fail safe or something. I have one that's the same, and the wire isn't long enough to splice.
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Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
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Ah, ok. Maybe I should buy a spare just in case.

Is this what I should get?
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Molto Verboso
Scattered remnants of (two!) 1974 Rallys
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Molto Verboso
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nomadinsiam wrote:
Ah, ok. Maybe I should buy a spare just in case.

Is this what I should get?
That's the one!

Can't hurt to have a spare. But they seem to work for years with the ground wire missing. :)
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Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
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I'll get it and let the old one take its time. Thanks very much. I appreciate it. Just another Vespa weirdness.
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Molto Verboso
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Molto Verboso
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nomadinsiam wrote:
I'll get it and let the old one take its time. Thanks very much. I appreciate it. Just another Vespa weirdness.
I had one fail once when I was on a long ride. It just suddenly stopped.

I guess that's how those work. They're pretty bulletproof, but will die instantly.
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1978 P150X; 1982 P200e
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1978 P150X; 1982 P200e
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The ground wire on the CDI for my P150 disintegrated and was just hanging by a bit of rubber. Same as you: seemed to be working but I replaced just in case.
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2007 Stella 225
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Solder a new ground wire on, not hard to do. That scooter shop has a rewire kit for stators.
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Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
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There's not enough wire there to solder anything to. I'll just keep using it until it dies then replace it with the new one I have on the way
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nomadinsiam wrote:
There's not enough wire there to solder anything to. I'll just keep using it until it dies then replace it with the new one I have on the way
I just zoomed in and looked, I thought it was a just picture of the top of the CDI. Is that little round spot where a wire should be?

As an experiment, if someone really needed to fix that, you could try poking something small like a sliver of a spade terminal into that wire end and solder it in. Then solder a wire to that. Then cover with heat shrink tubing. You could wrap a piece of wire around the stripped end to keep the wire in a bundle also.
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1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
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@safis avatar
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
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You can use acetone to remove a bit from the sealant around it and solder a new wire, although it's an auxiliary ground. The CDI is already grounded through the white wire...
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Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
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Ossessionato
Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
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UTC quote
SaFiS wrote:
You can use acetone to remove a bit from the sealant around it and solder a new wire, although it's an auxiliary ground. The CDI is already grounded through the white wire...
Ok, I see. Just dig out a bit of the plastic to get at the wire. Thanks.
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Mine packed up suddenly last year. Just went to kick over and nothing doing. Its was 17 years old so clearly last a long time.
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