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Member
LX 150
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Location: A.Z USA
 
Member
LX 150
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Location: A.Z USA
UTC quote
Hello, I'm working on a friend's 2009 Lx150, and I was hoping to find some help here.

TL:DR: no spark on LX150, during Pick-up inspection found no continuity on CDI connector, checked for resistance on the flywheel connector. Pick-up resistance under appropriate values. I just wanted to ensure that I'm taking the measurements in a correct way.



The bike is carbureted, but also has an electric fuel pump. The bike was sitting for a good year plus. I replaced the battery, replaced the intake manifold since there was a rip on it, I cleaned the carburetor, syphoned and changed the old gas on the bike and replaced it with fresh gas. After that the bike did start very nicely. and then she sat on my garage for about a week. When I went to start her again, the bike would crank (turn over) but it wouldn't run.

Immobilizer seems to be working ok (turns on when the bike is switched to Off, turning the switch to ON makes the Led blinks once, then goes away)

I checked the spark plug, no spark. changed the spark plug. no spark.

Went to the manual they indicate that if no spark, to check continuity between terminal 2 (Green) and terminal 8 (Black) on the CDI connector. I found no continuity, so an open circuit.

The manual states that: "If an open circuit is found, repeat the inspection between the flywheel connector and earth. If unacceptable values are found, proceed by replacing the pick-up, otherwise repair the cable"

I tried measuring between the "flywheel connector" and earth, I'm just not sure if I'm doing this correctly and since the manual does not give clear instructions on how to do this, I wanted to check in the forums for some guidance, since people here seem not only really helpful, but also vastly knowledgeable on these machines.

I checked for the resistance in 2 ways 1. by touching the metal plate behind the Pickup and then the ground connection screw on the bike. 2. by touching the little spade connector for the pickup inside the flywheel connector, and then the same ground screw on the bike.

-The resistance consistently measured below acceptable levels-

I'm just looking for guidance before ordering anything, to make sure that I'm actually checking for the resistance in an appropriate way. Also, I don't think I've seen JUST the pickup for sale on the quick google searches I did, will I have to replace the whole stator?

I'm attaching pictures to illustrate.
Checked for continuity between terminals 2 and 8 on CDI connector
Checked for continuity between terminals 2 and 8 on CDI connector
Checked for resistance between the flywheel connector and earth, resistance Below acceptable levels.
Checked for resistance between the flywheel connector and earth, resistance Below acceptable levels.
Checked for resistance between pickup plate and ground. resistance Below acceptable levels
Checked for resistance between pickup plate and ground. resistance Below acceptable levels
⚠️ Last edited by lagartx3 on UTC; edited 1 time
@greasy125 avatar
UTC

Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
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@greasy125 avatar
Weird 80's Vespas & Cool Vintage Lambrettas
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Location: The state of insanity, SoCal
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The testing process looks correct to me. The method lined out in the FSM is fairly straightforward and definitive.

You are correct, the pick up is not available separately. Best repair is the whole assembly replacement.
UTC

Molto Verboso
portofino green GTV 300
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Molto Verboso
portofino green GTV 300
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Welcome to MV from New England, great first post, hope you get it sorted.
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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@jimc avatar
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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Don't be put off by resistance readings that seem to be somewhat low or high from the manual. If under half, or double, OK, very suspect. But +/- 20 to 30% is usually fine, especially if the measuring instrument type is undefined - a 20kohm analogue meter will read differently to a 1Mohm digital one, and the digital one (unless pretty high calibre) may not have a good zeroing procedure for low ohms readings.

A bad pickup will either be a high resistance (bad solder joint, easy to fix) or low resistance (possible shorted turn, in which case replacement is the only answer).
@motovista avatar
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Veni, Vidi, Posti
GT 2.4
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@motovista avatar
GT 2.4
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A complete brand new OEM Vespa stator will set you back about $50. Check the flywheel while you've got it apart. Piaggio has had issues with the plastic lining coming apart and locking up the motor.
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greasy125 wrote:
The testing process looks correct to me. The method lined out in the FSM is fairly straightforward and definitive.

You are correct, the pick up is not available separately. Best repair is the whole assembly replacement.
Thank you for your answer, and yeah, I looked for a while before I realized it.
I find it kind of funny how they don't mention that you need to change the whole assembly on the manual.
OP
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LX 150
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LX 150
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jimc wrote:
Don't be put off by resistance readings that seem to be somewhat low or high from the manual. If under half, or double, OK, very suspect. But +/- 20 to 30% is usually fine, especially if the measuring instrument type is undefined - a 20kohm analogue meter will read differently to a 1Mohm digital one, and the digital one (unless pretty high calibre) may not have a good zeroing procedure for low ohms readings.

A bad pickup will either be a high resistance (bad solder joint, easy to fix) or low resistance (possible shorted turn, in which case replacement is the only answer).
Hi Jimc thank you for your answer.

I considered that since the multimeter I use is an automatic one, (it's not really a cheapo, but it's not an expensive or particularly fancy unit) The measurements could be a bit off, but I consistently got very low readings: 5 Ohm, 2 Ohm, etc. Nothing higher than 8 Ohms. The manual indicates acceptable value for the Pick-up resistance to be around 105 - 125 Ohm.

I'm not sure how else to proceed from here besides with changing the stator, especially since the sparkplug itself and the Coil seem to be in working condition.

Any lead will be highly appreciated.
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Motovista wrote:
A complete brand new OEM Vespa stator will set you back about $50. Check the flywheel while you've got it apart. Piaggio has had issues with the plastic lining coming apart and locking up the motor.
Hi Motovista thank you for replying.

I checked for them at SooterWest and they're runing for $85 right now. I would really appreciate it if you could direct me to the site where they are $50.
@greasy125 avatar
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Weird 80's Vespas & Cool Vintage Lambrettas
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@greasy125 avatar
Weird 80's Vespas & Cool Vintage Lambrettas
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lagartx3 wrote:
Hi Motovista thank you for replying.

I checked for them at SooterWest and they're runing for $85 right now. I would really appreciate it if you could direct me to the site where they are $50.
scooterpartsco ET stator
@greasy125 avatar
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Weird 80's Vespas & Cool Vintage Lambrettas
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@greasy125 avatar
Weird 80's Vespas & Cool Vintage Lambrettas
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Location: The state of insanity, SoCal
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lagartx3 wrote:
Thank you for your answer, and yeah, I looked for a while before I realized it. I find it kind of funny how they don't mention that you need to change the whole assembly on the manual.
I think that they figure it's kind of part and parcel with new stuff that everything is compartmentalized and gets replaced as an assembly.

to that end of things, I will mention that ones I've replaced all seemingly failed on the source coil and not the pick up/sensor itself or the solder joints/wiring.
@jimc avatar
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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@jimc avatar
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: UTC
Posts: 43876
Location: Pleasant Hill, CA
UTC quote
lagartx3 wrote:
Hi Jimc thank you for your answer.

I considered that since the multimeter I use is an automatic one, (it's not really a cheapo, but it's not an expensive or particularly fancy unit) The measurements could be a bit off, but I consistently got very low readings: 5 Ohm, 2 Ohm, etc. Nothing higher than 8 Ohms. The manual indicates acceptable value for the Pick-up resistance to be around 105 - 125 Ohm.

I'm not sure how else to proceed from here besides with changing the stator, especially since the sparkplug itself and the Coil seem to be in working condition.

Any lead will be highly appreciated.
I have to say I've never been a fan of auto-ranging meters - it's all to easy to mistake what range they're really on, especially if taking lots of readings in succession when fault-finding.

When I find a measurement that indicates a fault, I usually quickly double-check with a different meter.

Your low resistance readings suggest to me that you're just measuring from frame to a short to frame somewhere in the wiring - the stator wiring isn't insulated at the internal connections.
⚠️ Last edited by jimc on UTC; edited 1 time
@cosmos avatar
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Addicted
2009 LX 150, 2024 GTS Super
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Location: Birmingham, Alabama, USA
 
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@cosmos avatar
2009 LX 150, 2024 GTS Super
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Scooterpartsco stator/pickup. This one indicates it is for LX150 and is the one I used recently for mine. Not sure if the one for ET listed above is entirely suitable. Same price.

https://scooterpartsco.com/080-roma-oem-c-801_3422/oem-stator-for-vespa-piaggio-aprilia-125-150-200-leader-p-28716.html
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greasy125 wrote:
Hey greasy125 Thank you so much for that info!! I ended up getting the stator and the Ignition coil with the cap, also what they call the variator nut, which as I understand is a 'safety' nut that need to be replaced every time it comes. the parts are on transit.
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