What could I be overlooking as to why my 50cc scooter has no spark?

by Serg
(Federal Way, WA)

Hello, I have a Chinese 50cc scooter that won't start. Has no spark, I have replaced ignition coil twice, tested all connectors and even disconnected kill switch to make sure that was possible problem.


Tested stator... has output while cranking of 30 a/c volts to the coil, but coil doe not trigger spark. I have replaced coil twice and still same effect, checked all grounds and stator resistance looks OK.

What I could possibly be overlooking? Thanks for any help I can get.

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Comments for What could I be overlooking as to why my 50cc scooter has no spark?

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Jun 12, 2016
no cdi box NEW
by: Anonymous

Some 2t chain drives like the 1e41 qmb or qma have mag like a Briggs and straton (look at magnatron Ing) they have no points or cdi. There are switching transistors in the coil. If coil is round with a square protruding part its probably a mag. Try to unhook kill switch and Ing switch because they ground the coil to kill engine. Make sure u have the right coil for this Ing because cdi style Ing coil wont work. I think the kill switch has been a problem on these but not sure. (only do the unhooked kill switch test with plug out of motor and ground to clean metal on motor,because scooter may start and u have no way to shut down if something goes wrong. I no I am late but hope this helps someone.

Oct 24, 2015
no spark NEW
by: Anonymous

I have a scooter that I put a new cdi box an new stator an a new spark plug on an it just sits an turns over does not have spark at all
I have been all over it with a volate metter an test light I put a new harness in it an still nothing

Aug 28, 2012
Pickup? NEW
by: Anonymous

Could be your pickup coil (pulse generator). It's a little box located just above and to the left of the flywheel/stator. If that's bad it won't send the signal to the ignition coil to fire.

Jun 24, 2012
manuals NEW
by: Anonymous

If you find the model number in the manual or on the title, putting it in the field in google will bring up scooted sites, many have a wiring diagram for you to look at.

Oct 14, 2010
where's my CDI?
by: Anonymous

some scooters like the fly 50 Piaggio has the CDI built into the ignition coil.....

Oct 05, 2010
no spark
by: serg

Voltage regulator the only box is by the headlight.

Oct 05, 2010
Has to Have One
by: JIm Zeiser

The scooter has to have one. Without getting too technical it needs some kind of control unit to operate. You say there's a voltage regulator in there. Is it on the frame or behind the front panel under the handlebars? If it's on the frame it's the CDI. The voltage regulator is usually up front under the headlight.

Sep 10, 2010
no spark
by: serg

I looked at that manual and it looks same as my scooter. But where CDI unit shows in the manual my scooter does not have one. Wiring goes from stator to coil and voltage regulator and ignition and kill switch. Has any one seen one without a CDI unit?

Sep 08, 2010
Here
by: Jim Zeiser

Someone just posted a manual for a 50cc GY6 at Scootdawg pg 109 tells you how to test the CDI but enter page 114 on the PDF.

http://k.b5z.net/i/u/6023538/f/4-Stroke_Engine_Manual_rev2.pdf

Sep 07, 2010
Scootdawg
by: Jim Zeiser

Go to Scootdawg.com forum There's a 50cc section there. I'm pretty sure every China scoot is running a CDI unit but maybe it's different for 50cc scooters. Ask there and they can help you.

Sep 06, 2010
no sparks?
by: serg

I don't see a cdi on this scooter, the wire for the trigger signal at the coil is to the stator in line with kill switch. And kill switch is when in off position sends 12v to coil, so I disconnected the kill switch, it has a silver aluminum box that hooks up to the charging system and the lights.

If I had a wiring diagram, it would make much better to trace the problem, I pulled all wiring out trying to trace where all of wire go to, maybe someone has a link to where I can down load one?

Sep 06, 2010
CDI
by: Jim Zeiser

Have you changed the CDI unit? If it's shot you won't get spark either. It's a black box connected to the coil.

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