It is my understanding that buzzing coils when you turn on the key (to battery) is a good thing. But, after a couple of cranks and no start the coils stopped buzzing. Does that mean something? After a few more cranks and no buzzing and engine finally fired up. This was the first startup after its winter nap. So, Iím just curious if something sounds amiss to you guys? The engine runs on mag as well.
A coil buzzes when the brush or roller in the timer touches a contact. It all depends on where the brush or roller was when the engine stopped. If it stopped on a contact, the coil will buzz when you flip the switch. If it stopped between contacts, no buzz.
Buzzing Coils is normal when in battery mode and hand cranking the engine. As you spin the engine over each of the four coils should buzz when the timer roller earths out. This is one thing that your listening for when starting the engine. Each coil should buzz for the same duration and the gap between each buzz should be similar. There is nothing better than the noise they make which are usually a different tone.
Many thanks for clearing this up for me, Steve & Alan.