sym 50cc no spark By robbie1944 (Read 6,443 times)

[robbie1944]

Hi
my grandson has a 2002 sym 50cc it has developed a fault will not start.
checked the plug no spark
it appears that there is no power going to the cdi unit as I have put a test light onto it and there appears to be no power
not sure what to check next any help would be very appreciatted
bob

[kz1000st]

The kill switch. See if it's on "run".

[robbie1944]

sorry to sound dull but where do I find the kill switch

[kz1000st]

It's on the right handlebar next to the throttle. Sometimes it accidentally gets pushed off.

[robbie1944]

all I can find on the right handlebar is the starter button and light switch

[rob63]

As far as I know, none of the small cc Syms have a kill switch. The CDI will be AC so have a look here scooterdoc.proboards.com/index.cgi?board=electrical&action=display&thread=4997
The wire colours may be different but should be in the same position. You should be able to check if the cdi wire to the ignition coil is sending out a signal. If no luck then pop the seat pan out and try and trace the wires from the stator, there should be a multiplug with 3 yellow wires and 2 separate wires. These two separate wires are the ones concerning the feed to the cdi from the stator. If there`s no feed from at least one when the engine is spinning then it`s time to take off the fan cover on the right side and the flywheel, and examine the stator physically for broken or melted wires.
It might be worth checking the ignition coil first as that`s easy to get to, make sure the plug cap is firmly attached to the lead and that the lead isn`t split near the coil, also check that the two spade terminals are firmly attached to the coil.

[robbie1944]

thanks for that I will try and check the stator
how easy it to change the stator if it is required

[kz1000st]

Oh sorry. I thought a kill switch was a Fed DOT mandate like auto-on headlights. The last 50cc Chinese scooter I had was equipped with one.

[Alleyoop]

Also check the GROUND WIRE going from the engine to the frame if the motor is not grounded it will not spark. Also check your battery ground to frame as well.
Alleyoop