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Plastic covered coils can develop cracks in the casing or cracks can develop in wire coverings which lets the current . The spark plug is fouled and shorted to ground or is open and the magneto, which is functioning normally, is unable to fire it. 1 in which the armature core is aligned with the poles, and a relatively difficult path in which the armature is 90 degrees out of alignment (Fig. Oct 9, 2011 5. The voltage causes a spark to jump across the spark plug's gap, and the spark ignites the fuel in the engine. Without a good stator, your engine will run poorly or not at all. This is the only light that lights in Off or R (other than the expected R light in R) 2. You engine will probably not run as smoothly once you do get it started.. if it will start at all. If your vehicle will not start, it is possible there is a problem somewhere within the points and condenser. Shackelchevy77 said: Before you decide that a coil is bad two problems i have noticed. If the cracks in the wire bother you, then either use some electrical tape to wrap it, or use some RTV silicone to cover the cracks. Outboard ignition coils, sometimes called coil packs, supply the high voltage required to fire spark plugs. The spark that appears each time you pull the starter rope should be bright and intense. There's a big mag shop down in Missouri or Oklahoma that overhauls Eisemann mags too. If you check your inspection plugs and notice that the brushes are damaged, then the most likely cause is that the armature . Another symptom of Mercury outboard bad stator is that you will get a lot of weak park and misfire. cut out switch corroded. Coil Failure The voltage generated across magneto coils is quite high, in the order of 20,000 volt if no spark plugs are in place. I thought timing the 4370 and 4371 with a 3 wire/2 light synch box would be easy but these are the symptoms I've noticed, are these normal or something more sinister? Remove the engine cover, locate the kill wire and unplug it first. In my experience with my 1987 200 HP Johnson, when one of the power packs went bad, all 3 of those cylinders on the port side went out. Mark, Your FM-J mag on that engine should use R2437 points, R2477C coil, AXMR2433 condenser. An open condenser will read infinity and is bad. I have a 2002 Sportsman 500 that will not hit a lick. If it did, you can just leave the test condenser in the circuit or remove . From the symptoms and observed damage, I would suspect that the ball bearings corroded and finally failed. This is a free and easy fix so try it out if your battery is still good. Instead, they actually generate the power for the spark plug using a magneto. The service manual has a diagnosis procedure for the ignition module. Start the engine and the misfiring should disappear. Then, compare that reading to the actual reading taken on the coil itself. Both the 2 and 3 need to be recharged periodically. Your new problem sounds like maybe an ignition coil. With coil wire disconnected should have 4000-5500 maximum ohms secondary resistance between points wire and center output. If the Electrex is put on backwards your engine will ignite before it should and thus make your engine run backwards. Observe that there is a normal spark that allows the mower to run. An ungrounded regulator would allow the battery voltage to shoot up and smoke coils. Of course a bad spark plug, dirty or out of adjustment carburetor, low compression, valves needing adjustment, cranking speed to slow, dirty air filter, clogged exhaust, intake air leak, and old gas. Air cleaner clogged, poorly sealed, or missing. 4. If you get sparks continuously without any stop then that is intermittent spark or misfiring. Aug 13, 2014. Beyond that, you can diagnose a bad coil by verifying that the rest of the ignition system is good, calibrated, and working properly. 2012-01-11 14:43:11. The way to tell the . pogobill. You'd certainly hear a big change in engine note if . Watch the way you tighten the bolts one will pull the coil away from the flywheel and the other will push it closer take your time and watch what happens. Remedy: Inspect pawls and stop pin for wear. B. The bolt you remove threads into a smaller hole in the crank. 1.4 Symptom 04: The lawn mower comes to a halt halfway through the job. 3000 hours is a dangerously long time for a magneto to run without inspecting. On a four-cylinder engine, it rotates at the same RPM as the engine. If you are having problems starting your car it may be sign of a bad armature. I f I remember correctly, the left magneto will have the typical smooth drop, while the right has a noticeable stuttering, shaking, and very audible drop (I believe below the 7% in the checklist). Quick tip on showing how to fix a possible cause of weak or no spark on small engines! Suspect that the CDI module (stator) is bad and service manual says to replace it with a known "good" module. Re: Stator Failure - Symptoms? A typical bad plug will cause an immediate drop of 250 or more RPM, at the mag check. Correct as necessary. At this point you should remove the carburetor and clean it, and also check the fuel system for any potential clogs. Only show this user. Bad Stator Fix--Don't Buy a New Stator for Your Engine! The opposite can also happen with the low-speed coil. If you see a spark jumping the gap between the top of the sparkplug and the ground, there is sufficient spark. You have tried leaning and cleaning the plug to no avail. This is often accompanied by a loss in engine power. If you do not address the issue, you can also do serious damage to your exhaust, resulting in unnecessary and costly repairs. First, find out what the resistance should be by looking it up in the bike's service manual. The silicone has a high enough of a breakdown voltage to fix the cracks. The symptoms you describe are classic "dying coil" symptoms. Start with the fouled spark plug possibility. The condensers last around 20,000 miles, so they do need to be replaced from time to time as a normal service item. Try clearing the plugs by running your engine up to 2000 RPM on both mags leaning to about 50 RPM lean of peak (continue to lean until you maximize RPM, then lean further until you lose about 50 RPM). Start with the fouled spark plug possibility. The Super Mag 2 and 3 are identical except that the magnet in the Super Mag 3 is stronger at 3.8 amps over the typical 3.3 of the SM2. Check a no-start. It resembles a spark plug but has a sunken center electrode that simulates a load on the coil. This is best done in the shade or at night. Advertisement. When low spark is detected on a plug, it might be time to replace a coil. Air/fuel mixture incorrect: Idle air screw mis-set. bluedogz Minister of Fire. Problem #1 is the leaking vacuum advance. The spark would be weak and maybe intermittent. #3. This created a rough idly and a motor that would not plane off. The point cover needs to be removed and some engines won't run without it, but if the condenser is going bad, you are likely to see a large yellow spark jump between the two contact points. Measure the distance between the flywheel and the magneto; it is usually set from .010-inch to .012-inch. The normal small drop in revs is irrelevant to this test; it's all-or-nothing, i.e. ,if shorted or open circuit,they are defective or leads bad. If so, and there is no spark, then the coil is bad. Likely the coil or CDI. Worth a call. As the ignition coils are among the ignition system's most vital components, an issue can cause spark to be compromised, which can quickly lead to performance issues. Does anybody have experience with seeing how a bad capacitor effects engine performance? One of the symptoms of a bad lawn mower ignition coil appears when you are . The test for a short is easy, zero or a low resistance is bad. If you check your inspection plugs and notice that the brushes are damaged, then the most likely cause is that the armature . The spark plug is fouled and shorted to ground or is open and the magneto, which is functioning normally, is unable to fire it. If all of the original emmisions stuff is still hooked up, There may be manifold vacuum to the advance due to either a cold or stuck vacuum valve. battery not charging because fault with rectifier (might just be corroded terminals) bad connection to coils. Attach the other wire of the test condenser to a ground. 1. your engine will idle alright and start up ok and when put in gear may or may not run and stall. Next, you should check the throttle/choke to be . If you do, you will most likely destroy your mag. You have tried leaning and cleaning the plug to no avail. According to this, my spark gap is supposed to be 0.011-0.015". Incorrect fuel level. The spark plug is fouled and shorted to ground or is open and the magneto, which is functioning normally, is unable to fire it. If you get spark then you have a wiring issue or one of the safety/ignition switches is at fault. Low compression: Spark plug loose or damaged threads I saw no apparent symptoms of a bad mag while flying prior to finding this. Loose wire connector. We manufacture new Super-mags and Sprintmags and supply the world with parts, drives and coils for the former Mallory product line. You also need to check all the battery, hot and ground wire connections. Once the magneto is assembled, and the armature is rotated, the flux path varies between a relatively easy path as shown in Fig. Only show this user. The key indicator is the suddenness of the drop. A good condenser minimizes this to a small blue spark but the points are sparking full-force with a yellow spark if the condenser is failing. Ok several things can make an engine hard to start. The Super Mag 3 has a long, metal .56uF capacitor on the outside, while the Super Mag 2 has a smaller .36uF on the inside. However, the problem is a charged condensor will also read infinity and that is normal. 1.3.1 Solution for Clogged Carburetor Bowl. A typical bad plug will cause an immediate drop of 250 or more RPM, at the mag check. If you think it may be the magnet though then grab a rotor off Ebay and try it. A bad spark plug ignition cable will have a much higher than normal resistance. Engine oil does not reach them. check connections to cdi unit. If you have a failing condenser, you could have hard starting issues and you could start burning the points. Push it in firmly to make sure there is a solid connection. seadooya Premium Member Premium Member Apr 24, 2010 #5 Put voltmeter on battery while holding it at 5500rpm, should be in between 13.5-14.5, if not, replace the rectifer, that would cause your battery to be dying. Click to see full answer. I doubt the stator. 1.3.4 Solution for overheated lawn mower ignition coil. bad plug bad ht cap or cable, , bad battery, needs a certain voltage to work magneto. 1. Your exhaust may emit a black smoke and you may . Lots of parts up around Maine , New Hampshire. Incorrect jet sizes. On some mags there's an opening in the bottom of the mag, between its forward bearing and the shaft's oil seal, so that engine oil can't get into the mag. #2. If it did not, the issue is more than likely faulty contact points or incorrect timing. Hard to start is from fuel leaking in or bad RV cover clearance or bad o-ring. On a six-cylinder engine, it spins at 1.5 times the engine speed. Feb 3, 2004. Low compression: Spark plug loose or damaged threads Starter jet clogged or restricted. Eventually the engine will not start at all. Bills86e Premium Member Premium Member Apr 24, 2010 #6 An engine that doesn't start easily can be as a result of bad spark plugs. Thanks for Watching!! The magnet retains its magnetism for years, and is re-magnetized when the magneto is opened up for repair or overhaul. Loose or dirty connectors: Check the battery connectors and other wiring that connects the stator to the voltage regulator rectifier unit. ! Pull the hose off the advance and see if there is vacuum there. We can rebuild/refurbish and upgrade any magneto for more output at the sparkplug. Crank the engine and observe the end of the sparkplug. Air/fuel mixture incorrect: Idle air screw mis-set. Feb 15, 2013 Suzuki SV 650 S Motorcycles 0 helpful 3 answers The symptoms of a failing condenser may also be attributed to a poor ground or a compromised wire. Mags came off for 500 hour inspection. . Here are some common symptoms that hint towards having failing points and condenser: 1.