I understand that this means I've got bad kill wires. Place the equipment stop switch control in the OFF or STOP position. 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. If you are experiencing ignition timing issues, this is most often due to a sheared flywheel key. BLACK WIRE - This is the engine kill switch, It needs to run to an ON/OFF switch and then run to earth. I am pretty sure that one goes to the coil and the other to the ground but I wanna make sure. The Magnetron has only two wires coming out of it: the thick high tension lead to the spark plug, and a longer, thin black wire with a spade connector on the end of it.
If no spark appears, check for broken wires, shorts, grounds or a defective stop switch. 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? Push the coil (armature) away from the flywheel and tighten one screw. Testing & Replacing a Stop Switch. Is there no spark in the engine of your lawn mower, snow blower or outdoor power equipment? Follow this guide to test your ignition system - including coil, switch & module - to identify any problems and troubleshoot repairs. Flywheel with magnets. Quick Links: The ignition system generates the spark needed to ignite the air/fuel mixture for your small engine. This shorts the kill wire to ground, which stops the spark. Replacing Ignition Coils or Armatures. This creates a risk that at some time, someone will accidentally start the engine while working on or around it. If engine dies while operating, ignition coil failure is possible. The required spark plug gap and voltage can vary depending on temperature, altitude and your engine settings. However a toggle-type switch, that will remain in the ground position once set there, is suitable.
This is the kill wire. Index cards of the proper thickness also work well. 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. My B&S v-twin will only fire when the "kill wires" are unplugged from the coils. Place the appropriate shim between the rim of the flywheel and the ignition armature. Disconnect battery ground first (if equipped). Old, damaged or fouled spark plugs can also require service or replacement.
If the engine does not produce spark, other areas of the ignition system should be checked before focusing on the ignition module as source of failure (see above). DO NOT CONNECT THIS WIRE TO POSITIVE POWER! Engine quits while running? Breaker point systems: used on engines made before 1980, these systems use a mechanical switch instead of a transistor to close the electrical circuit used to produce a spark. The terminal is located towards the base of the starter motor. Edit: or does that mean one of the safety switches is bad. This wire charges your battery. The kill wire works by grounding the internal part of the Magnetron that corresponds to the moving point in a points system. For information regarding this, please visit our Inspecting the Flywheel and Key FAQ. Any help would be apreciated..... Share this post Link to post Share on other sites. DO NOT attach the tester to the spark plug for this test. Common Spark Plug Problems. Place the stop switch control in RUN or START position. Please email comments about this website to.
See an authorized dealer or contact Briggs & Stratton if you are unsure of any procedure or have additional questions. 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. Remove blower housing. If the spark jumps the tester gap, your ignition coil is working fine. Hence, running the kill wire to either a momentary switch or a normal on/off switch, the other side of which is grounded, is a safe and effective way to stop the engine.
Common Flywheel Problems. Testing for spark at this time may show an ignition coil failure. If your ignition start or push button start needs replacing, consult a Briggs & Stratton dealer near you. 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. Then, disconnect the stop switch wire from the flywheel brake and remove the coil. Is it the diode that needs replacing? If not, it needs to be replaced. Then, tighten both mounting screws and rotate the flywheel until the shim slips free. Your engine repair manual will provide the proper gap for your engine. 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. I checked each one with an ohmmeter and all appeared in working order. 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. Remove the old ignition coil (armature) mounting screws.
While holding the shim, turn the flywheel until the magnets are directly adjacent to the armature. 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. When it stops, monitor the window. How To Inspect the Flywheel & Key. All trademarks and registered trademarks are the property of their.
Ignition Module Failure. How to Test the Ignition Coil in Your Small Engine. 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. Testing the Coil or Armature. How Do Ignition Systems Work in Small Engines & Lawn Mowers? One of these must complete the ground to shut off the motor im thinking??? Clip one end of the spark tester (service part number 19368) to the ignition cable and the other grounded to the cylinder head. 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. It starts up lights work etc no issue. The engine may start.