ISO 2 stroke ignition guru

[ford4150]

Coil and condenser. New aftermarket.
Tested anyway. Condenser will take a charge and hold it.

Connected black wire from stator to coil yellow wire. Grounded coil with jumper wire to engine case.
Flywheel installed. Spark tester installed between high tension lead and spark plug installed in head.
Spun motor with electric drill.
No spark.

Finished with test info.

[J-Mech]

File points.
Check for no short to ground on kill wire. (Disconnect it)

Are the points getting any voltage? Check with test light while spinning engine.

[ford4150]

Originally Posted by J-Mech

File points.
Check for no short to ground on kill wire. (Disconnect it)

Are the points getting any voltage? Check with test light while spinning engine.

Points are lightly filed with a points file and cleaned with rubbing alcohol.
Motor is on test stand, not installed in frame. There are no wires connected except those mentioned.
Points getting voltage?? There is no battery. This is a moped. Pedal it a couple revolutions and the motor is supposed to start.
The points are behind the flywheel. I don't see how to connect a test light behind the flywheel and spin the engine.
Your help and interest is appreciated.

[ford4150]

Coil test that I used:

[J-Mech]

Originally Posted by ford4150

Points are lightly filed with a points file and cleaned with rubbing alcohol.

Ok. Most likely making contact then.

Originally Posted by ford4150

Motor is on test stand, not installed in frame. There are no wires connected except those mentioned.

Good deal. Not likely a short then. Still possible.... but less likely.

Originally Posted by ford4150

Points getting voltage?? There is no battery. This is a moped. Pedal it a couple revolutions and the motor is supposed to start.

The points still have to get power. That's what the stator does. It makes electricity when you spin the motor, whether that is via your drill, or from the pedals. The points have to get power or no sparky, sparky.

Originally Posted by ford4150

The points are behind the flywheel. I don't see how to connect a test light behind the flywheel and spin the engine.
Your help and interest is appreciated.

The coil is outside the the engine, yes? Connect a test light to the wire that from the points to the coil. Disconnect the wire at the coil, and insert a test light. It should blink when you spin the engine. If not, your not getting power to the points, or they are not opening/closing.

I think I have a book on that engine... I'll go dig around and look at it real quick to refresh my memory. It's been a while since I played with an old Honda motor..

[ol'George]

Just a guess here, is the movable point of the set inadvertently grounded? (chaffed wire or similar)
is the coil that makes power for the ignition system ok? (not shorted or open) so it is able to make power to operate the ignition system/high voltage coil.
From the pix, it looks like you have 2 lighting coils as well as a coil for ign system.
Those handlebar switches/controls are known for problems, as John suggested.
Thinking the switch interrupts the power generated for the ign system rather than use a "kill" wire to ground a "magneto"
do you have a wiring diagram to support your troubleshooting endeavor?
Never worked on that particular moped, but on similar small honda 60-90 CC engines, and that was how they worked
Edit:
John & I are thinking/posting about the same time, along the same lines AGAIN, HA,LOL

[J-Mech]

Thought of something else. IIRC, that ignition coil bolts to the frame of the cycle. If you have the engine out of the frame and on a bench, did you bolt the coil to the engine? I believe that it has to be grounded.

[ford4150]

"The coil is outside the the engine, yes? Connect a test light to the wire that from the points to the coil. Disconnect the wire at the coil, and insert a test light. It should blink when you spin the engine. If not, your not getting power to the points, or they are not opening/closing. "

There are a couple windows in the flywheel. Rotating the engine by hand I can see the points open and close.

Coil is outside the engine. I connected a 6V test light between the black wire from the stator and the yellow wire on the coil. Spun the motor. Nothing.

Connected a DVM in place of the test light, set on VAC. Got 8.9 mV at max drill speed, spark plug removed from head. Not sure if that's enough to charge the condenser.

[ford4150]

Originally Posted by J-Mech

Thought of something else. IIRC, that ignition coil bolts to the frame of the cycle. If you have the engine out of the frame and on a bench, did you bolt the coil to the engine? I believe that it has to be grounded.

I have a jumper wire from the coil mounting bolt hole to the engine case for a ground.

[ford4150]

Info taken from mopedarmy.com relating to stator testing: