Mon Dec 13, 2021 3:39 pm

Lurker
vespa sprint
Joined: 13 Dec 2021
Posts: 4
Location: holland
 
Lurker
vespa sprint
Joined: 13 Dec 2021
Posts: 4
Location: holland
Mon Dec 13, 2021 3:39 pm linkquote
Hello people,

just got a vespa sprint out of 2014 and having a issue.. It starts well and runs also well. But there are two things.

1 the rpms are not getting high. It stays at a certain rpm and it is not getting up. It also happens when i am not using the centre stand.
2 the rear wheel is not turning.

I have 2 video's that showcases the issue the vespa has.

I hope you guys can help me out with this issue.
Mon Dec 13, 2021 9:03 pm

Veni, Vidi, Posti
GT 2.4
Joined: 04 Feb 2013
Posts: 7655
Location: NWAOK
 
Veni, Vidi, Posti
GT 2.4
Joined: 04 Feb 2013
Posts: 7655
Location: NWAOK
Mon Dec 13, 2021 9:03 pm linkquote
Sounds like an immobilizer circuit. But it's a 50cc model. Did you recently do any work to it, like put in really heavy weights? Clutch and rear wheel look okay
Mon Dec 13, 2021 11:09 pm

Member
GTS300 Super HPE, Primavera 125, S 50 4T
Joined: 23 Sep 2019
Posts: 15
Location: Belgium
 
Member
GTS300 Super HPE, Primavera 125, S 50 4T
Joined: 23 Sep 2019
Posts: 15
Location: Belgium
Mon Dec 13, 2021 11:09 pm linkquote
1. Variator not moving in when accelerating.
2. Clutch not engaging, stuck, or worn pads.

Disassemble the variator, check the rollers, clean the slide bus.

Remove the clutch bell and check the pads. Replace if needed.

Motor runs, belt looks alright at first sight. Should not be a problem to fix.
Tue Dec 14, 2021 12:54 am

Lurker
vespa sprint
Joined: 13 Dec 2021
Posts: 4
Location: holland
 
Lurker
vespa sprint
Joined: 13 Dec 2021
Posts: 4
Location: holland
Tue Dec 14, 2021 12:54 am linkquote
Thank you guys, ii will have a look on it. I havent done any work on it yet.
Tue Dec 14, 2021 12:59 am

Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: 06 Dec 2010
Posts: 3798
Location: Kingdom of Lanna
 
Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: 06 Dec 2010
Posts: 3798
Location: Kingdom of Lanna
Tue Dec 14, 2021 12:59 am linkquote
the immobilizer system because it sends a signal to the coil when to fire and also limits the spark (Rev Limiter).

https://modernvespa.com/forum/topic8606

Maybe this will help?

Edit:
Quote:
Vespas in downtown environments tend to get knocked over and pour oil into their air box, so if you have a paper filter your bike might not fire up, but if you have a foam filter you should still be okay to get home/to the shop.
Tue Dec 14, 2021 4:35 am

Lurker
vespa sprint
Joined: 13 Dec 2021
Posts: 4
Location: holland
 
Lurker
vespa sprint
Joined: 13 Dec 2021
Posts: 4
Location: holland
Tue Dec 14, 2021 4:35 am linkquote
Cheked the clutch and rolls today. Has some wear but not that bad.

Tue Dec 14, 2021 5:42 am

Contributor
2007 LX 150 (memories)
Joined: 12 Jun 2007
Posts: 8485
Location: New Hampshire
 
Contributor
2007 LX 150 (memories)
Joined: 12 Jun 2007
Posts: 8485
Location: New Hampshire
Tue Dec 14, 2021 5:42 am linkquote
waspmike wrote:
the immobilizer system because it sends a signal to the coil when to fire and also limits the spark (Rev Limiter).

https://modernvespa.com/forum/topic8606

Maybe this will help?

Edit:
If it is a 50cc model, I don't think it has an immobilizer.
Tue Dec 14, 2021 5:48 am

Ossessionato
BV350, Primavera 150, Yamaha Zuma 125
Joined: 06 Jun 2013
Posts: 3693
Location: Twin Cities, Minnesota
 
Ossessionato
BV350, Primavera 150, Yamaha Zuma 125
Joined: 06 Jun 2013
Posts: 3693
Location: Twin Cities, Minnesota
Tue Dec 14, 2021 5:48 am linkquote
With the engine off and the scooter on the center stand, does the rear wheel spin freely? If not, is the rear brake dragging?
Tue Dec 14, 2021 10:56 am

Hooked
2020 primavera 150
Joined: 08 Aug 2020
Posts: 416
Location: Lorton virginia
 
Hooked
2020 primavera 150
Joined: 08 Aug 2020
Posts: 416
Location: Lorton virginia
Tue Dec 14, 2021 10:56 am linkquote
Did you check the exhaust?
Tue Dec 14, 2021 11:05 am

Addicted
Piaggio Beverly 300 ie - 2012
Joined: 08 Aug 2021
Posts: 684
Location: Belgium
 
Addicted
Piaggio Beverly 300 ie - 2012
Joined: 08 Aug 2021
Posts: 684
Location: Belgium
Tue Dec 14, 2021 11:05 am linkquote
waspmike wrote:
the immobilizer system because it sends a signal to the coil when to fire and also limits the spark (Rev Limiter).

https://modernvespa.com/forum/topic8606

Maybe this will help?
(...)
Something like in this post of collbain 2000 from Jan 30, 2007 seems very plausible. (in the link waspmike shared)

The engine starts up and idle is perfect but when you turn the throttle then at a certain rpm the engine sound changes and the engine clearly does not ignite at every compression stroke, it runs irregular and clearly misses several compression strokes in between ignitions.

If engine rpm is indeed limited to 2000, then that is probably too low to have the clutch engaged.

So I would start with checking the key and the immobiliser system of your scooter (or better: have it checked because if there is something wrong with it you probably cannot fix it yourself)
Tue Dec 14, 2021 11:19 am

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 41399
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 41399
Location: Pleasant Hill, CA
Tue Dec 14, 2021 11:19 am linkquote
That sounds like a virgin immobiliser, before it's been programmed with any keys.

If you have the master (brown) key you can try re-programming it.
Tue Dec 14, 2021 11:50 am

Lurker
vespa sprint
Joined: 13 Dec 2021
Posts: 4
Location: holland
 
Lurker
vespa sprint
Joined: 13 Dec 2021
Posts: 4
Location: holland
Tue Dec 14, 2021 11:50 am linkquote
I got it! I changed the cdi with another one. Thank god the issue is solved. This model has no immobilizer. I am gonna clean everything up and put everything back. Clean it til it's shining and put another picture of it! Thank you all for the help and idea's.

edit: cdi is not shown in the picture (was curious what that is)



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