OP
Fri, 10 Mar 2023 14:02:53 +0000

Member
MotoVespa P200e
Joined: Wed, 28 Feb 2018 20:04:06 +0000
Posts: 12
Location: Mirfield, West Yorkshire
 
OP
Member
MotoVespa P200e
Joined: Wed, 28 Feb 2018 20:04:06 +0000
Posts: 12
Location: Mirfield, West Yorkshire
Fri, 10 Mar 2023 14:02:53 +0000 quote
Hi All,

I am in the process of converting my VBB2T from 6 volts to 12 volts electronic ignition, and being a bit of an electrical ignoramus who is colour blind, you can imagine that things are not going smoothly! However, I do have a friend who is a bit of an electrical guru, but he is struggling to help as well; so here is my problem which I do hope someone can help me with.

Bit long winded, so please bear with me!

I have fitted a 12v electronic Bajaj stator plate. Wire colours from stator are: Red, Purple/violet, Grey, Green and Black. Using kickstart, I am getting power from the red and violet (both plugged into cdi), and green. Attaching a wire to the bottom terminal of the CDI, I still get power from the unattached end, but when I attach to coil connecting terminal, there is no power coming through to the HT pin!
If I put my electrical tester pen onto the metal part of the coil, my pen lights! If I connect my cdi to engine case thereby earthing it, no power from cdi to coil!
We have tested both cdi and coil and readings are within tolerances!
I have attached a couple of pics which hopefully may help. I am only trying to get the engine started at this time. Am I doing something stupidly incorrect, missing something obvious?
All help gratefully received. Tia.







Fri, 10 Mar 2023 14:09:22 +0000

Molto Verboso
Joined: Thu, 03 Nov 2011 19:17:41 +0000
Posts: 1702
Location: Racing Capital of the World
 
Molto Verboso
Joined: Thu, 03 Nov 2011 19:17:41 +0000
Posts: 1702
Location: Racing Capital of the World
Fri, 10 Mar 2023 14:09:22 +0000 quote
The very best move you can make at this point is take the entire Bajaj electronic ignition and remove if from your engine. Once it is removed, chuck it in the trash.

Buy a SIP VAPE ignition.
Fri, 10 Mar 2023 14:45:19 +0000

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: Thu, 16 Jun 2011 14:59:35 +0000
Posts: 7532
Location: Nashville
 
Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: Thu, 16 Jun 2011 14:59:35 +0000
Posts: 7532
Location: Nashville
Fri, 10 Mar 2023 14:45:19 +0000 quote
GickSpeed wrote:
The very best move you can make at this point is take the entire Bajaj electronic ignition and remove if from your engine. Once it is removed, chuck it in the trash.

Buy a SIP VAPE ignition.
This was going to be my first statement. I can't +1 this hard enough. That kit is garbage.

Next, you probably want to just replace the wiring harness with a 12v conversion harness. I prefer the BGM conversion harness over the SIP competitor because it comes with newbie-friendly installation instructions and actually connects up to the Vape better than SIP's own offering.

If you decide to try to re-use the old harness, you're going to have a steep learning curve, because the 6v system was what was called "balanced," meaning that it tried to maintain constant load by shorting unused circuits (e.g. the horn and brake light) to ground when not in use.

If that last sentence didn't seem to make sense, just go with the new harness. It'll be MUCH easier in the long run. Just trust me on this one.
OP
Fri, 10 Mar 2023 15:06:34 +0000

Member
MotoVespa P200e
Joined: Wed, 28 Feb 2018 20:04:06 +0000
Posts: 12
Location: Mirfield, West Yorkshire
 
OP
Member
MotoVespa P200e
Joined: Wed, 28 Feb 2018 20:04:06 +0000
Posts: 12
Location: Mirfield, West Yorkshire
Fri, 10 Mar 2023 15:06:34 +0000 quote
GickSpeed wrote:
The very best move you can make at this point is take the entire Bajaj electronic ignition and remove if from your engine. Once it is removed, chuck it in the trash.

Buy a SIP VAPE ignition.
Cheers. Going to sell scoot on when it is built, so just wanting to get it running without too much expenditure! I'm aware that the Bajaj system is not the best though, so I will bear your advice in mind!
OP
Fri, 10 Mar 2023 15:10:52 +0000

Member
MotoVespa P200e
Joined: Wed, 28 Feb 2018 20:04:06 +0000
Posts: 12
Location: Mirfield, West Yorkshire
 
OP
Member
MotoVespa P200e
Joined: Wed, 28 Feb 2018 20:04:06 +0000
Posts: 12
Location: Mirfield, West Yorkshire
Fri, 10 Mar 2023 15:10:52 +0000 quote
chandlerman wrote:
This was going to be my first statement. I can't +1 this hard enough. That kit is garbage.

Next, you probably want to just replace the wiring harness with a 12v conversion harness. I prefer the BGM conversion harness over the SIP competitor because it comes with newbie-friendly installation instructions and actually connects up to the Vape better than SIP's own offering.

If you decide to try to re-use the old harness, you're going to have a steep
learning curve, because the 6v system was what was called "balanced," meaning that it tried to maintain constant load by shorting unused circuits (e.g. the horn and brake light) to ground when not in use.

If that last sentence didn't seem to make sense, just go with the new harness. It'll be MUCH easier in the long run. Just trust me on this one.
Thanks. Have already replaced loom with a 12 volt one (Indian). Not got that far yet though, just wanting to get engine fired up!
Fri, 10 Mar 2023 15:32:02 +0000

Molto Verboso
1958 Allstate 177VMC, 2005 70cc Yamaha Vino
Joined: Sun, 23 Aug 2020 21:02:46 +0000
Posts: 1341
Location: Philadelphia
 
Molto Verboso
1958 Allstate 177VMC, 2005 70cc Yamaha Vino
Joined: Sun, 23 Aug 2020 21:02:46 +0000
Posts: 1341
Location: Philadelphia
Fri, 10 Mar 2023 15:32:02 +0000 quote
Is the cdi grounded? Sounds like maybe it isn't.
Fri, 10 Mar 2023 16:05:51 +0000

bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: Thu, 26 Sep 2013 22:01:08 +0000
Posts: 6695
Location: So Cal
 
bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: Thu, 26 Sep 2013 22:01:08 +0000
Posts: 6695
Location: So Cal
Fri, 10 Mar 2023 16:05:51 +0000 quote
Quote:
If I put my electrical tester pen onto the metal part of the coil, my pen lights! If I connect my cdi to engine case thereby earthing it, no power from cdi to coil!
Sounds like an internal short in either the coil or the CDI.

As others have rightly pointed out, the Bajaj ignition is notoriously unreliable. Endless headaches.
OP
Fri, 10 Mar 2023 16:53:46 +0000

Member
MotoVespa P200e
Joined: Wed, 28 Feb 2018 20:04:06 +0000
Posts: 12
Location: Mirfield, West Yorkshire
 
OP
Member
MotoVespa P200e
Joined: Wed, 28 Feb 2018 20:04:06 +0000
Posts: 12
Location: Mirfield, West Yorkshire
Fri, 10 Mar 2023 16:53:46 +0000 quote
FridayMatinee wrote:
Is the cdi grounded? Sounds like maybe it isn't.
When I attach cdi to engine case, no power from bottom connection of cdi as though charge is going to ground. Unattach, and power is back!
Mon, 13 Mar 2023 21:19:45 +0000

Hooked
PX150E
Joined: Sun, 28 Oct 2018 11:54:55 +0000
Posts: 212
Location: Florida, USA
 
Hooked
PX150E
Joined: Sun, 28 Oct 2018 11:54:55 +0000
Posts: 212
Location: Florida, USA
Mon, 13 Mar 2023 21:19:45 +0000 quote
Martin20 wrote:
When I attach cdi to engine case, no power from bottom connection of cdi as though charge is going to ground. Unattach, and power is back!
I am not familiar with the Bajaj CDI system; however, since you loose power to the coil when the CDI case is attached to the engine, perhaps the proper way to mount the CDI is via rubber insulators? Worth a try, I'd say.....
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