2008 Sunl 250 Wont run.... By thetucks (Read 5,826 times)

[thetucks]

I have a brand new coil that I put on and there was no change. Also the battery is fully charged to 12.6. that has been verified at the cdi.

[Bashan]

Pickup coil?

[Alleyoop]

I want to know where that GREEN/WHITE wire goes that is coming from his PICK UP COIL. His PICK UP COIL HAS TWO WIRES, BLUE and YELLOW and GREEN and WHITE.
Alleyoop

[thetucks]

I will trace where it goes first thing in the morning alleyoop. I too would like to know. I understand it should be grounded but it looks as it goes somewhere else first.

[Alleyoop]

I was asking the Electrical gurus(HAHA). But it would help if you traced it.
Alleyoop

[Bashan]

Blue/yellow is probably the trigger impulse wire although from what I can see on the pix it must change before the CDI. The green/white on a 250 vertical is possibly a ground function for a side stand safety switch. So has anybody checked that function to see if there's a problem? I think this spark disruption every other stroke is not possible. It is simply an erratic spark due to the genesis side or on the ground side. Rich

[Alleyoop]

That is what I think as well that the Green/White is ground. Also that is why I asked if we could see this thing idle and then how it acts and sounds when he gives it throttle.
Alley

[Bashan]

You are spot on my wizened friend. Rich

[Alleyoop]

This looks like what his wiring is: The colors match his:
Alleyoop

[JR]

Nope that diagram is for a two spark plug set up and is not applicable. The colors don't match unless I'm blind.

Is that your CDI with the wiring? If so then can you see what is wrong? The CDI in my photo isn't a image I googled but a actual CDI from a 250 CDI setup scooter, mine. The vertical and horizontal 250's use the same exact CDI and as I told you wire colors may vary some.

Your colors two plug

Black = 12 vdc from ignition

black/white = kill wire, this wire is a ground wire and not run through the ignition, as I said you can pull this wire and the engine will run. When the kill switch is applied it simply grounds out the CDI. It may indeed be bad but it has a ground wire run to it and NOT 12vdc from the ignition, person wouldn't need two voltage sources, if this wire does have 12vdc on it then someone has screwed up the wiring.

Four plug

white/red = pulse/trigger coil wire, this pulse coil is NOT two wire

yellow/black = CDI coil feed wire

Green = ground and it's the ground for the CDI to function not a ground for the pulse coil

My colors two plug

Black = 12vdc

Gray/white = kill wire

Four plug

red/white = pulse coil

black/yellow = cdi coil feed wire

Green = ground

Take note of where you green wire is on the plug and where mine is. And can someone show me a green/white wire in his photo?

Also of major importance, is the engine block grounded?

When I say grounded does it have a ground wire hooked any where on the engine block and ran to the frame and hooked up where the negative battery cable hooks up. Also have you checked the ground wires especially the green one from your CDI for proper ground? half arse grounds = half arse running scooter and even the other coil ground wire, not grounded well = irratic spark.

Did you mention this was a used scooter and hadn't ran in some time? Did the previous owner mess with the wiring?

[thetucks]

I did notice your green is in a different spot then my green on the 4 plug. why is that?

The motor is grounded good to the frame and to the battery.

also it dont idle completely smooth now that the timing is set exactly right. before I took it apart and checked everything I just kept moving the teeth one at a time until it idled smooth. and it did but when I took it apart the piston was about an inch from the top of the cylinder when the cam was strait. so that wasn't right. so I set everything now to perfect top dead center. the t on the flywheel matches the cylinder at the top of the cylinder and the cam is a perfect triangle.

Yes I got this scooter not running. the previous owner was into the motor so its no telling what else he did.

[thetucks]

Here is whats odd...coming from the coil pickup I have Blue/yellow and green/white. they go to a plug before it goes into the wire harness. at that plug it switches the blue/yellow over to green and the green/white over to red/white.

[thetucks]

[thetucks]

OK the green/white actually goes to the cdi and the instrument cluster and the other is ground.

[JR]

I'm leaving for a Easter dinner to my in-laws and will be back this evening, if your drawing is the way it's wired then someone has changed the pulse coil to a two wire coil and it's probably getting the wrong signal. All two wire pulse coils I've ever seen are for 50 and 150 scooters, in fact a lot of them are for 2 strokers. Even if one wanted to use a two wire pulse coil, I do believe this one is bad?

You should have one single wire pulse coil and that's it. Wrong signal = wrong firing sequence. The red/white also goes to the tach if the scooter has one.

I would do this, check the 3 yellow wires on the stator to be sure it's good by simply ohming from one yellow to the next as in

Wire 1 to wire 2
Wire 1 to wire 3
Wire 2 to wire 3

Can mark them to eliminate confusion and they should ohm out nearly the same on each wire, do NOT ohm to ground, this is a 3-phase stator. If they are good then more than likely the stator pulse winding coil is good too and from there I would buy the correct pulse coil.

JR