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Vespa cdi failure ?
Posted: Sun May 24, 2015 11:46 pm
by Soulstylist
My scooter is miss-firing intermittently ..
I have rewired any loose connections as needed and checked & cleaned carb,
changed plug, suppresser cap & ht-lead,
I have narrowed it down to two possibilities in line ignition or cdi unit..
when the cdi is on its way out does it start running erratically ?
ie ..as if it's not firing consistently with almost like a lack of power mid way through with the revs cutting in and out ?
ps it's a ducati cdi that's fitted (4 pin type)
cheers for any help
Re: Vespa cdi failure ?
Posted: Mon May 25, 2015 9:12 pm
by coaster
In my personal experience, CDI's tend to just die but LT coils can and do give erratic symptoms. Get hold of a test meter and check the resistance to earth values on the LT coil (green) and Pickup (red). I THINK the Vespa readings are similar to Lambretta ones so you need to see around 430 ohms or better on the LT Coil and 95-115 on the pickup.
Re: Vespa cdi failure ?
Posted: Wed May 27, 2015 12:40 am
by Soulstylist
thanks for that
Re: Vespa cdi failure ?
Posted: Wed May 27, 2015 7:20 am
by Daggs
Soulstylist wrote:My scooter is miss-firing intermittently ..
I have rewired any loose connections as needed and checked & cleaned carb,
changed plug, suppresser cap & ht-lead,
I have narrowed it down to two possibilities in line ignition or cdi unit..
when the cdi is on its way out does it start running erratically ?
ie ..as if it's not firing consistently with almost like a lack of power mid way through with the revs cutting in and out ?
ps it's a ducati cdi that's fitted (4 pin type)
cheers for any help
A CDi on one of my lambrettas did exactly that. (and it's a quick and easy change to try, before the LT coil)
Re: Vespa cdi failure ?
Posted: Sat May 30, 2015 4:07 pm
by Soulstylist
Daggs wrote:Soulstylist wrote:My scooter is miss-firing intermittently ..
I have rewired any loose connections as needed and checked & cleaned carb,
changed plug, suppresser cap & ht-lead,
I have narrowed it down to two possibilities in line ignition or cdi unit..
when the cdi is on its way out does it start running erratically ?
ie ..as if it's not firing consistently with almost like a lack of power mid way through with the revs cutting in and out ?
ps it's a ducati cdi that's fitted (4 pin type)
cheers for any help
A CDi on one of my lambrettas did exactly that. (and it's a quick and easy change to try, before the LT coil)
Cheers guys tried and replaced cdi..defo not that, I am now going to try the LT coil ,,,,