OP
UTC

Member
Primavera 50
Joined: UTC
Posts: 5
Location: Norway
 
Member
Primavera 50
Joined: UTC
Posts: 5
Location: Norway
UTC quote
Hey,

I have a 2018 Vespa Primavera 50 2 stroke that will not start.

It was running great and while driving it suddenly stopped. Like a cable suddenly loosened.. After that I have not been able to start it.

There is no spark on the plug. I have installed a new sparkplug.

I have tried another coil from my 2008 model Vespa LX 50 (I assume the coils are the same). Did not get spark with that coil. So, I assume the coil is good.

Any hints on further troubleshooting for this?

Bård
UTC

Hooked
2020 primavera 150
Joined: UTC
Posts: 423
Location: Lorton virginia
 
Hooked
2020 primavera 150
Joined: UTC
Posts: 423
Location: Lorton virginia
UTC quote
Check the kill switch
OP
UTC

Member
Primavera 50
Joined: UTC
Posts: 5
Location: Norway
 
Member
Primavera 50
Joined: UTC
Posts: 5
Location: Norway
UTC quote
Thanks,

This is a European model so it does not have a kill switch.

The starter motor runs fine when trying to start, but just no spark.

Bård
@attila avatar
UTC

Veni, Vidi, Posti
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
Joined: UTC
Posts: 8291
Location: Latina (Italy)
 
Veni, Vidi, Posti
@attila avatar
In garage: Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956
Joined: UTC
Posts: 8291
Location: Latina (Italy)
UTC quote
BF wrote:
Thanks,

This is a European model so it does not have a kill switch.

The starter motor runs fine when trying to start, but just no spark.

Bård
Spark plug wire and connecting pipe ..?
OP
UTC

Member
Primavera 50
Joined: UTC
Posts: 5
Location: Norway
 
Member
Primavera 50
Joined: UTC
Posts: 5
Location: Norway
UTC quote
Already tried another coil with the spark plug connector. No change so coil + plug I have ruled out.

Ok. Measured the stator.

White to ground: 0,1ohm
Red to white: 125ohm
Green to white: 1,5 Ohm

From what I found the values should be 0 to ground (good), red 500ohm and green should be around 100ohm.

Not sure if those values are for vintage Vespas though.

To me this Looks like the stator is fried with a short in the green (low powered coil?).

Seems like replacing the stator is the way to go here.

Anyone know if my assumptions seem correct?

Update: I did the same measurement on my LX 50 and the readings were similar. 0, 128 and 3,8. I messured on the connector that goes into the coil, distonnected it from the coil first of course.

Now I am confused.

Bård
OP
UTC

Member
Primavera 50
Joined: UTC
Posts: 5
Location: Norway
 
Member
Primavera 50
Joined: UTC
Posts: 5
Location: Norway
UTC quote
I now measured the AC voltage from the stator. I disconnected the coil and measured the green and red against the white ground while cranking the starter.

1,1 ac volts and
25 ac volts

Seems a bit low. I was expecting 50 volt pluss while cranking on the green.

Bård
Forum member supplied image with no explanatory text
@motovista avatar
UTC

Veni, Vidi, Posti
GT 200
Joined: UTC
Posts: 9255
Location: Main Street, Watts
 
Veni, Vidi, Posti
@motovista avatar
GT 200
Joined: UTC
Posts: 9255
Location: Main Street, Watts
UTC quote
Is the white the ground? Usually it's green or black. If you've switched cdis with a known good and it didn't fix it, the problem should be statore or regulator. Can you rob the regulator off the lx and see if that brings spark back? Does the lx run with the coil from the 'vera?
OP
UTC

Member
Primavera 50
Joined: UTC
Posts: 5
Location: Norway
 
Member
Primavera 50
Joined: UTC
Posts: 5
Location: Norway
UTC quote
Thanks. I verified that the coil, cable and plug worked. So, I concluded that it is indeed the stator. Bought New stator with flywheel today. Mounted and it now runs.

I dropped the regulator test as I believe that is only required for charging and not to start.

Thanks for hints. My Primavera now runs.

Bård
@xantufrog avatar
UTC

Moderibbit
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: UTC
Posts: 8891
Location: Atlanta, GA
 
Moderibbit
@xantufrog avatar
1980 P200E - "Old Rusty", 1976 ET3 Primavera
Joined: UTC
Posts: 8891
Location: Atlanta, GA
UTC quote
good troubleshooting! Odd failure to see on a 2018 scooter - but at least you got it sorted
DoubleGood Design banner

Modern Vespa is the premier site for modern Vespa and Piaggio scooters. Vespa GTS300, GTS250, GTV, GT200, LX150, LXS, ET4, ET2, MP3, Fuoco, Elettrica and more.

Buy Me A Coffee
 

Shop on Amazon with Modern Vespa

Modern Vespa is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com


All Content Copyright 2005-2025 by Modern Vespa.
All Rights Reserved.


[ Time: 0.0142s ][ Queries: 4 (0.0060s) ][ live ][ 325 ][ ThingOne ]