Saving Terrilee's Chrissy!  By  JR (Read 1,123 times)

Been seeing that fellow member Terrilee has been having a bad spell with Chrissy and sad to see her scooter not running.

Also from what I've read Terrilee is giving a real go at it but not having any luck so I thought I could put up a few pictures and some help that might get her on the right track.

First things first and that's the volt meter. I took the liberty of copying Terrilees meter and put some instructions on it as far as the leads and settings to use to test for voltage to the CDI from the stator.



Can be confusing but set the meter to 200VAC. Put the black common lead to ground and the best source for this is the negative terminal of the battery itself.

The red testing lead is the one used to check various points of what needs to be tested.

Now here is the 5 leads that come from the engine stator on the common GY-6 engine;



Take note the 3 plug is white, green and yellow, these go to the R/R and have nothing to do with the scooter's spark or firing system so we just make sure they are snugly plugged into the other end and move on.

Next you see two single bullet connector wires a blue/white and a red/black.

Blue/white = pulse sensor or pick up coil wire to CDI
Red/black = AC voltage to CDI

But when you look at your CDI it gets confusing sometimes for some people because the Chinese for whatever reason change colors on you!

So here is a picture of the two plugs that plug into the CDI;



You say What happened to the blue/white?

here's what we have;

Green = ground
Yellow/black = feed wire to spark plug coil
Black/white = engine kill wire to ignition/emergency engine kill switch

Now here's the other two;

Red/white = pulse sensor or pick up coil wire to CDI (IT PLUGS INTO THE BLUE/WHITE AT ENGINE!)

Black/red = AC voltage from engine stator, yes it plugs into RED/BLACK (yea I know the colors are the same but reversed)



So now that we have this out of the way lets test the stator voltage;

(1) set volt meter to the 200VAC range
(2) tie brake handle closed with rubber band or string
(3) turn on ignition key
(4) make sure emergency kill switch is in engine run position
(5) place black volt meter lead to battery negative
(6) place red volt meter lead on red/black on CDI
(7) turn engine over and take reading

For the stator AC voltage to be good enough for a scooter to run it should read from 50VAC to 100VAC, anything less than that is either a bad stator or bad connection.

I do say the bad connection because if I remember right you recently did a valve job and it's easy to knock wires loose when doing this kind of work happened to many a person. You need to make sure these bullet connector wire I mentioned are plugged in right and making a good connection.

Now the pulse sensor or pickup coil wire. If this is not functioning then the CDI doesn't get a message to fire so do all of the above EXCEPT put the red volt meter lead on the RED/WHITE wire and give her a spin.

This voltage is very small and the CDI can get a signal with as little as 0.5 volt and it will read only up to the 3 or 4 volt range at the most. The voltage reading will fluctuate a lot when testing this.

Also another thsng to check is all ground wire connections including the green wire to the CDI and coil, a poor ground can cause a lot of headaches.

Hope Terrilee doesn't give up and we can get Chrissy humming again and we're here to help.

JR