Briggs & Stratton
I have an 80,s model troybuilt tiller.it has magnatron 5 hp. engine with electric start.when i had bad spark i took off flywheel and their was one wire that looked to run from underside of stator but im not sure.it was poorly connected if it was at all.it has electric start and will crank but the wire pieces that come off of coil are broken off.dont know if they are supposed to attach anywhere.could u pls help.sincerely RA
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If you give me the model number I could look it up and get you a breakdown on it..
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Mutual inductance and transformer action
If two coils of wire are placed next to or around each other and an electric current is used to create a magnetic field around one coil (which we call the primary winding), the magnetic field will also surround the second coil (or secondary winding).
Magnetron™ solid state ignition systems, in essence, replace the mechanical breaker points with a transistor. That is, we replace a mechanical switch with an electronic one. No moving parts, no arcing, no adjustments and solid state reliability.
Vibrations can damage ignition coil windings and insulation causing shorts or breaks in the secondary windings. The overheating of ignition coils can hinder their ability to conduct electricity. Wear and tear is a common reason for ignition coils failing.
1 Answer. The usual idea is that with 2 wires; one is ignition controlled 12v and goes to the resistor (block on the side with two terminals) so that the coil receives about 9v during normal running.
Inside an ignition coil there are two sets of wire windings (aka coils, that`s why it`s called a “coil,” get it?). The two windings—known as a primary set and a secondary set—surround an iron core. When battery current flows into the primary windings, it produces a magnetic field.
The typical wiring for a three-wire ignition coil-on-plug assembly are battery voltage power supply, ground and control circuit (trigger) from the PCM to a transistor circuit in the coil on plug assembly.
Yes, if the points are open and/or the electronic module is NOT CLOSED then you will measure battery voltage on both the coil (+) and coil(-) terminals. Since there is no current flowing through the coil (no path to earth) then both sides of the coil will be at the same potential.
To diagnose a coil pack, set the multimeter to the 200 Ohms range, place the positive and negative probes on the identical terminals of a coil, and check the multimeter for a reading. A value between 0.3 ohms and 1.0 ohms means the coil is good, depending on the model.
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the most relevant questions and answers related to your specific issue
What are the symptoms of a bad coil on my Poulan chainsaw? Mine only sparks at high RPM’s, as tested with my electic drill motor spinning the engine and grounding the removed spark plug to the engine head. I don’t want to buy a new coil if that may not be the problem. I’ve already checked the kill switch wiring and the high tension spark plug wire itself, as well as trying several different plugs.
There has to be a reasonable spark at hand cranking speed, with most electronic ignitions they work off speed of rotation so you do need to crank the engine at a fair speed, check the air gap between the flywheel magnet and the ignition core, this should be around 0.3mm, if there is not spark at all when cranked well it will be a replacement unit required.
Iginition coil test for sthil 044 – Stihl Chain Saw Handle Models 044 046 Ms440 Ms460
If it makes a blue spark, it’s probably good. More orange, probably too weak.
My chainsaw has no spark, I have checked the spark plug and it works on another unit, i guess it may be the ignition, ho0wever as it is a small coil I have no way of checking. can the coil be simply tested, otherwise can one be purcahsed.
Yes the coil can be tested. you would need to know the proper specs but with a multimeter you should be able to get a resistance value from your plug wire to ground. With my experience 10000 – 30000 ohms should allow it to run. If this is no help one common thing is your kill switch. A wire should run from the coil to the switch, if this wire is shorted to ground it will not run.
I have mtd large wheel push mower tecumseh model 501039c engine has no spark to plug, coil checks good. i have disconnected the ground wire from the coil that leads to? and grounded the coil to another part of the mower and will get spark to the plug that way. I have not tried running the mower with the coil grounded where I have it. What can be the problem?
I would say if you can get a spark by moving the ground, try running the mower. If it works you should be OK.
What is the spark plug gap for a ryobi string trimmer model # ry30550 ?
I can’t say for sure, but it’s PROBABLY about 0.035″.
Where is the spark plug located? trying to change it and have no diagram.
Your spark plugs are on the end of wires, typically near the top of the engine. You likely have more than one.
I have an 11.5 hp Briggs It will start 2-3 times and then nothing NO spark. plug is new, I suspect the coil, what do you think?
Use 2 thicknesses of a match book,or .012,,pull the black wire off the coil and start it,if it runs then a safety switch is bad
How to replace ignition coil on asthil 029
Coil should be held on the saw with 2 torx t27 size screws. These will resemble a star. Remove the 2 screws, lift out the coil. The small wire should be attached with a spade connector, slide the spade off with needle nose pliers. Disconnect the spark plug wire from the spark plug, & thread it out of the saw as you remove the coil. Assembly is reverse order of removal. For clearance, loosen coil screws, alike coil away from flywheel