OK it took me a spell to figure out what's going on and I believe after back tracking and looking at the stator setup picture I just put my finger on a few things. I spent several hours last night doing research. I've also been googling my but off and looking at some other Yamaha two strokers and here is two statements that tell me some things;
You are talking about the white/red wire ? When I hook it as JR said above I have no fire. When it is hooked up as he had me do at first it starts and idles fine, runs sort of ok when I first start giving it gas but craps out when I try to give it more than just a little throttle. The more throttle the more she spits, sputters and bogs. I no longer believe it to be the carb, But now am thinking it is something to do with the timing (stator hook up). Where is this white/red wire supposed to hook into ? It has to get a signal from somewhere. I think it controls the timing advance. The problem is the stator has 6 wires and the new CDI only has 5 wires. Is the black plastic piece on the outside of the magneto(flywheel) with the white/red wire the pick up that controls the timing? I am not sure of the name of all the components , I know what the magneto and stator are but like the black plastic piece on the inside of the magneto with the black/red wire and the white/green is called. I know we are right on the edge of getting it, there has to be just some little something that's not right. Well my brother used his multimeter and checked out the blk/red wire from the stator going to the 2 wire connector to CDI ,the second wire is white/green. From blk/red to ground while cranking engine there is nothing, same thing with the white/green wire to ground. But when he checked between the blk/red and the white/green from stator there was around 75 volts AC while cranking the engine over. The single white/red wire coming from the stator also puts out some AC voltage while grounded and the engine is cranked.
Now your picture above is what is called a 2 stroke 7-coil stator and it is typical on lots of 2 stroke stators except one thing, the single coil to feed the CDI with AC power. Take note of the wires, the 6 open wire coils are for the charging system and have the yellow/red and white wire, enough said they have nothing to do with the CDI, in fact don't even need to be hooked up for the scooter to run. Reason I say this is because last year we had a member here that we through lots of research we found that the CDI was fed from the regulator and it was the Honda Sky. We also know that through this research that Suzuki did the same thing on some of their European 50cc 2 strokers. It threw me for a loop and from what I can see this is not the case here.
Now the coil across from the AC coil that you have the arrow to is indeed the pick up coil or sensor feed coil to the CDI and we now know it has the single white/red wire. It should hook up to this new performance CDI and we all know this sends the signal to the CDI as when to fire but yet when we tried to use it so far the CDI will not fire then?
Now here is the odd thing that I'm still trying to figure out. The coil you have the arrow to is indeed the seventh coil and it is the AC power feed to the CDI and it has the red/black and white/green. This is what's odd. Most stators on this coil only have one single wire and it's also red/black and feeds the CDI with power, the other end of the coil is grounded off. One like this;
.ebay.com/itm/VER-2-Gy6-2-Stroke-49cc-50cc-1PE40QMB-Stator-Magneto-JOG-Minarelli-49cc-Chinese-/190667682022?pt=LH_DefaultDomain_0&hash=item2c64adf0e6&vxp=mtr" rel="nofollow" target="_blank">
.ebay.com/itm/VER-2-Gy6-2-Stroke-49cc-50cc-1PE40QMB-Stator-Magneto-JOG-Minarelli-49cc-Chinese-/190667682022?pt=LH_DefaultDomain_0&hash=item2c64adf0e6&vxp=mtrNow you can see this one is listed as JOG.Minarelli and it's a 7 coil staor with a 3 plug and 2 single wires and it's a cup of tea to use with the performance CDI you bought.
But now look at this;
.ebay.com/itm/Gy6-2-Stroke-49cc-50cc-1PE40QMB-Stator-Magneto-JOG-Minarelli-49cc-Chinese-Parts-/200724030160?pt=LH_DefaultDomain_0&hash=item2ebc15a2d0&vxp=mtr" rel="nofollow" target="_blank">.ebay.com/itm/Gy6-2-Stroke-49cc-50cc-1PE40QMB-Stator-Magneto-JOG-Minarelli-49cc-Chinese-Parts-/200724030160?pt=LH_DefaultDomain_0&hash=item2ebc15a2d0&vxp=mtrTake note JOG/Minarelli and exactly like yours 7 coil with a 3 plug and a 2-plug with a single wire for 6 wires total. Also read this in the description;
Some Engines Don't Need All The Wires Hooked Up To Run. Many Only Use 4 -Wires. Also Colors Of Wires May Vary From Picture.So I figured if this is so then we can still use the CDI you bought on your stator as it appears to be the same setup? It looks exact except the 2 plug has different colors?
But I also figured if they sell a 6 wire stator then they should sell a 6 wire CDI right? I've googled the world over and have only got close and not sure if the ones close will work but in googling for this information I did find this and I know this is true on some 4 stroke CDI's and it's this;
.ebay.com/itm/Yamaha-New-DT250-DT400-IT400-YZ250-IT-YZ-250-400-CDi-Unit-F8T00-5-6-wires-DT4-/200783084651?pt=UK_Motorcycle_Parts&hash=item2ebf9abc6b" rel="nofollow" target="_blank">.ebay.com/itm/Yamaha-New-DT250-DT400-IT400-YZ250-IT-YZ-250-400-CDi-Unit-F8T00-5-6-wires-DT4-/200783084651?pt=UK_Motorcycle_Parts&hash=item2ebf9abc6bTake note that it is stated that this is a 5 or 6 wire CDI and that two are grounds, if you don't need one then just leave one off and this is found occasionally on 4 stroke CDI's but I'm not thinking this is the case hear but we can look at it anyway.
Now here is some more information I've found and I consider this a reliable resource and it is from a friend and valued Ebay seller Carlos with Autotech;
.ebay.com/itm/Performance-CDI-JOG-50cc-1E40QMB-2-stroke-Yamaha-engine-1PE40QMB-/230818424651?pt=Motorcycles_Parts_Accessories&hash=item35bdd9a74b&vxp=mtr" rel="nofollow" target="_blank">.ebay.com/itm/Performance-CDI-JOG-50cc-1E40QMB-2-stroke-Yamaha-engine-1PE40QMB-/230818424651?pt=Motorcycles_Parts_Accessories&hash=item35bdd9a74b&vxp=mtrThis is his 2 stroke performance CDI 5 wire and is also listed for the JOG/Mineralli and here is what Carlos says about this CDI:
Minarelli horizontal type 50cc 2 stroke engine
most
Yamaha JOG 50cc
not for ZUMA 50cc/BWS 50/Beewee50 YW50
also not for Vino 50cc
this cdi is 4 plugs-5 wires type.
&
China made 2 stroke 50cc scooter
1E40QMB & 1PE40QMB
please attention.
not all 1E40QMB & 1PE40QMB
use the same CDI.
please check you original CDI PLUG
the same with photos.
some of China made scooter is 2 plugs/6 wires type CDI
Remember we have thoughts that this scooter was built on the Vino pattern? Well the 50cc Vino does have a 6-wire CDI but I damn sure haven't located one? Might be a thought to call the Yamaha dealer or go see him and ask if they have a 6-wire Vino CDI?
Looks like we now may know whay this isn't working and here's my thought. The green/white wire is supplying the pickup coil feed and it is steady and not changing as the RPM of the engine is. When the engine revs to a higher RPM the pick up coil reads this and also the coil feeds more AC power to the CDI for a hotter spark as the engine gets more fuel to run faster.
That's why it idles but craps out when you open the throttle. So now IMO here is our options. This all started from buying a non-running scooter and someone screwing with the wires and I'm convinced we wired the OEM CDI up correctly and it's bad and that's why the scooter didn't run to begin with when he bought it.
So here is the options IMO;
(1) I'm holding out hope that this stator can still be made to work with this new 5-wire CDI and here's my thoughts. Re-install the stator and lets test one thing. Remember in your statement that when you put the volt meter on the black/red and white/green you got up to 75Vac? You also stated that you got a AC reading off of the single white/red wire also.
(2) take the green/white wire and ground it to the scooter temporarily, anywhere where you have a good ground hook up.
(3) take you volt meter and touch one lead to the red/black from the stator and the other lead to ground and turn the engine over and see if you have this 75Vac reading again, don't hook up the CDI just read the voltage on the stator wires.
(4) Also do the same thing on the white/red one lead to ground, one lead to the white/red and see if you have a small AC reading.
If this checks out then hook up the CDI the same except hook the white/red from the stator to the red/white to the CDI, leave the green/white grounded, then test for spark.
If you have spark then see if it runs any better.
If this doesn't work then of course we need to either some how find a 6 wire CDI or change the stator if we can find one to match to a 5-were type.
I found this place that has a phone number that might be a source for the 6-wire CDI plus we need to contact Carlos and see if he has anything?
.pccmotor.com/cdi-rev-box.html" rel="nofollow" target="_blank">.pccmotor.com/cdi-rev-box.htmlLets do the test above and go from there.
JR
