Armatures are often packaged with a thick piece of paper to assist in setting the gap. On most models, this contact touches the speed control lever on the governor plate when the speed control is set to minimum. Many a technician is fooled into replacing a good coil because the coil grounding lead was shorting out against a piece of sheet metal. You can also test the flywheel magnets for any potential issues. The engine may start. Testing & Replacing a Stop Switch. Remember, the kill wire must not be connected to a non-zero voltage. It starts up lights work etc no issue. Because the ignition module is electronic and does not utilize moving components, it is normally one of the most reliable part of the engine. GREY WIRE - This needs to run to an on/off switch and then to positive power on your battery, this controls the carby solenoid for fuel. Small Engine Ignition Parts. Replacing Ignition Coils or Armatures.
Find all Engine Safety Warnings. Whether you start the engine with a pull rope or the turn of a key on an electric start motor, you're relying on the ignition system to produce a spark inside the combustion chamber. WARNING: Always read the engine and equipment manual(s) before starting, operating, or servicing your engine or equipment to avoid personal injury or property damage. Disconnect battery ground first (if equipped). ORANGE WIRE (IF FITTED) - Can be connected to headlights or any other accessories. There have been many reports of Magnetrons being destroyed by ride-on mower tenants who connected the kill wire to the +12 Volt terminal on the starter switch, instead of the switchable ground terminal. For information regarding this, please visit our Inspecting the Flywheel and Key FAQ. Turn the flywheel so the magnets are on the opposite side from the ignition coil (armature). Insert the spark plug lead on one end of a spark tester and attach the tester's alligator clip to ground, such as an engine bolt. Servicing Spark Plug Problems. Disconnect the stop switch wire from the flywheel brake or other stop switch and remove the coil/armature. See an authorized dealer or contact Briggs & Stratton if you are unsure of any procedure or have additional questions.
Usually the kill wire is also connected to the Magnetron by a spade connector, but it may be hard-wired at that end. Make sure the coil grounding/kill wire is not rubbed through or pinched and shorting out against a piece of sheet metal. Remove blower housing. If no spark appears, check for broken wires, shorts, grounds or a defective stop switch. I checked each one with an ohmmeter and all appeared in working order. The kill wire works by grounding the internal part of the Magnetron that corresponds to the moving point in a points system. Push Button starting or Pull Cords (depending on your engine type). Testing for spark at this time may show an ignition coil failure. Moe1965 607 #1 Posted September 26, 2016 I have a wheel horse SB 421 with a 11 hp briggs that will not shut off with the key i have replaced the ignition switch. Rotate the flywheel rapidly using the recoil or electric stater (at least 350 RPM) and watch for spark in the tester window. How to test and repair small engine ignition system problems? Quick Links: The ignition system generates the spark needed to ignite the air/fuel mixture for your small engine. To best determine the cause of failure, please consult an Authorized Dealer.
It's the first time I've ever done this, but I believe I did it correctly. This shorts the kill wire to ground, which stops the spark. Common Spark Plug Problems. We have listed below, the wires found on the new Briggs & Stratton single cylinder engines and where they need to be connected to. BLACK WIRE - This is the engine kill switch, It needs to run to an ON/OFF switch and then run to earth. Just back to where the wires are enclosed in plastic, as shown below, or does it go further back. Be sure to unhook the coil from the equipment wiring harness as well as the engine's wiring harness and use the spark tester. Push the coil (armature) away from the flywheel and tighten one screw. If you are replacing your ride on mower engine with one of the new Briggs & Stratton Single Cylinder Ride on Mower Series Models, the wiring loom and connector might be slightly different to your old model, depending on what brand of ride on mower you have.
The kill wire normally runs to a contact on the governor plate above the carburetor. Then, disconnect the stop switch wire from the flywheel brake and remove the coil. I would not recommend the use of a momentary contact switch, since that would leave you with no way to disable the engine except disconnecting the spark plug. It has a magneto not a coil.
I understand that this means I've got bad kill wires. Engine Specs Pages: Briggs & Stratton. Attempt to start the engine using the rewind cord or key (if equipped). The coil is probably the easiest thing to check and therefore the first thing to check when embarking upon ignition system troubleshooting. Please email comments about this website to. If a spark appears, inspect the stop switch for damage. Here is that engine's illustrated parts list: Here is the operator's manual: It was manufactured on 13 October, 1988, so of course it has Magnetron ignition, as you said. Im not the original owner so i dont know if someone flipped something around. Hook the tester up between the ignition cable and the spark plug and start the engine. That makes the module function as if the points are not opening and closing, so there can be no spark. I just put a 3hp briggs flathead on my db30, I want to connect the existing kill switch, I have an idea how to do it, but have no time to mess around, could anybody please post pics of how it hooks up for me?
Once the engine is running, the flywheel keeps rotating, the magnets keep passing the coil and the spark plug keep firing based on a specific timing. What part needs to be replaced. Edit: or does that mean one of the safety switches is bad. Once you have confirmed that the stop switch is working, reconnect the spark plug lead. Your engine repair manual will provide the proper gap for your engine. If engine dies while operating, ignition coil failure is possible. Common armature gap ranges are. Old, damaged or fouled spark plugs can also require service or replacement. This is the kill wire. Without the grounding lead installed, you won't be able to turn it off.
If you do not have repair manual contact your local dealer for the correct specification. Engine quits while running? There should be no spark.
Common Mistakes When Testing Coils. DO NOT attach the tester to the spark plug for this test. Attach coil wire to tester and tester to ground for this test, DO NOT attach to spark plug for this test as the engine may start. Reconnect the stop switch. When you start your lawn mower or small engine, the rotation of the flywheel causes its magnets to pass the coil (or armature). Is there no spark in the engine of your lawn mower, snow blower or outdoor power equipment?
How Do Ignition Systems Work in Small Engines & Lawn Mowers? Place the appropriate shim between the rim of the flywheel and the ignition armature. Additional questions? Loosen the tight screw so the magnets pull the ignition armature against the flywheel and shim. Step 2: Spin the flywheel rapidly (at least 350 RPM) and watch for spark in the tester window. Clip one end of the spark tester (service part number 19368) to the ignition cable and the other grounded to the cylinder head. The correct placement of the ignition system coordinates the timing so that the spark will ignite the air-fuel mixture in the combustion chamber just as it reaches maximum compression in each engine cycle- thus, maximizing the engine's power. Testing the Coil or Armature.
This creates a spark. However a toggle-type switch, that will remain in the ground position once set there, is suitable. If you know your specific problem, jump down to the section for step-by-step instructions. Unhook the spark plug wire and secure it, removing any batteries, if equipped.
If not, it needs to be replaced. Then, tighten both mounting screws and rotate the flywheel until the shim slips free. Your mower will have a starter motor engaging solenoid, so you must connect the wire that runs from this solenoid to the terminal on the starter motor. When it stops, monitor the window. How To Inspect the Flywheel & Key.
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