Did you set the air gap @ approx .010 on the new coil?
Now as far as starting with your hand over the carb.
You are doing 2 things:
#1 increasing the richness of the incoming charge.
#2, decreasing the compression pressure by restricting the amount of air entering the cylinder.
That makes it easier to ignite the mixture with a weaker spark.
It is not unheard of to get a bad new coil, I understand your not wanting to spend 30 minutes removing the engine to get at the coil to replace it.
As a test:
Decrease the spark plug gap to .020 and see if it helps starting.
If it does, it reaffirms the idea that it is ignition related.
Also, remove the white magneto kill wire plug @ the connection closest to the coil and see if that helps.
I've seen them shorted, or shorted @ the Ign. switch.
lets us know what you find.
Edit,
I've also seen aftermarket coils that do not produce spark at less than optimal cranking speed.
|