voltage questions on stator pickup By godfeast (Read 4,952 times)

[godfeast]

I just finished swapping in a semi-rebuilt gy6 to my scooter and Ive run into a no spark situation.

I swapped in a newish (working >500miles) stator/pickup assembly, but I seem to be getting a bad reading from it, so before I go back and tear it out, I'd like to pick your brains.


On testing the leads from the stator, I found the red/black bullet lead to produce an avg of 80ish volts on cranking. Seems good.

The pickup however is only reading .25v on cranking.

I'm reading a few faqs/posts/pdfs on this and some say 1.0v is needed, some .5, and one .045.

Is it? o.O Whats the real minimal operating voltage from the pickup?

If not, is it possible to get a crap pickup voltage reading from having screwed up the timing, and Would this possibly produce no spark?

I'm of the mind that I'd get spark if timing was off, but it'd run like shit, but would like to know what you all have to say.

If the stator reading is indeed bad, what can cause the low voltage reading from the pickup? Did I likely break a wiring wrap on the coil, am I likely shorting a wire out on install, etc... What did I probably do to cause this?


Thanks again guys.

[tvnacman]

the triger coil is mounted outside the flywheel . I have heard the spacing of the coil to the flywheel can effect the output voltage . If not sounds like the pick up/pulse coil maybe defective .

John

[godfeast]

I was kind hoping for voltage values I could rely on, so I would know for sure.

I installed the stator, so I know where the pickup is, but no mods were done to it (longbo 150cc now with a 9 pole stator), so spacing shouldnt have changed..

Thank you though.

[tvnacman]

I would swap the pick coil and see if it starts . Its like a gost town today .

John

[godfeast]

I have a backup 6 pole stator and pickup, but would like to AVOID pulling that thing out again if I can( T-storms all over central florida today and I have to work on this outside. Its already a PITA to get readings as is, lol).

I'm also worried about the cdi - doesnt seem to be giving good readings, but cant find definitive values for that either and im not sure if a bad pickup would still let me get decent readings anyways.

[alleyoop]

Since you swapped out a motor did you GROUND the motor to the FRAME if not you will NOT HAVE SPARK. So check out the ground from motor to frame.
Alleyoop

[godfeast]

yep. Always check that and double, then triple check. Fusing too.

battery to framing secure, then the ground to the engine at the stator cover as well.

I'm going to quit trying today as I'm too soaked to keep playing with electrical parts, but maybe the doc can shed some light on this soon.

[godfeast]

HALP?

o.O

[JR]

Did you swap out the other components too like the coil and CDI? At this point with 80Vac on the red/black and the voltage you have on the pickup you should fire.

Also the two wires on the CDI from the stator are single bullet connector wires, make sure they are clean and making good contact and also on the CDI and coil wires.

JR

[godfeast]

Scooter was firing pre-engine swap.

I have not swapped anything else out; The stator was done just because It was a new 9 pole and my other two were ones with high mileage and 6 poles.

I have a half dozen coils, so shouldnt be an issue even if it gets that far, so I assume im at the point of just changing out the cdi.

Can you provide a reference for me as to what voltage values the cdi should be putting out at the coil?

I cant seem to find this information ( only a couple references to what the coil should be putting out, and some resistance readings for the cdi and coil, but no voltage values from the cdi leads to the coil terminals.

[JR]

thescooterprofessor.proboards.com/index.cgi?board=elec&action=display&thread=259

Testing the CDI is all but impossible unless you have the equipment to do so but the above is a right on way to do it and with values for the ignition system.

JR

[tvnacman]

Have you tried a new spark plug?

John

[godfeast]

I'm testing everything in line and the point of failure seems to be the cdi to coil.

Spark plug is new on rebuild and gapped properly.

Waiting another day for cdi to arrive.

[tvnacman]

the pick up coil from the other stators you have . you can mount them/it to your scooter just the pick up coil . and take a voltage reading . You never know it just might start .

John

[godfeast]

I received my new cdi yesterday, put it in and still no spark.

I replaced the coil and still no spark.

Given the information I have already posted, what else might I be overlooking?

Need to get this scooter running again soon.