bad magneto symptoms

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This solution completely bypasses the stator by using a 12 volt battery to power the ignition system. 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? check connections to cdi unit. Bills86e Premium Member Premium Member Apr 24, 2010 #6 That was a real pain for me. This is often accompanied by a loss in engine power. An engine that doesn't start easily can be as a result of bad spark plugs. B. Something to check on. 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. If the flywheel is too far from the magneto, your magneto won't be able to generate enough currency to send to the spark plugs. The voltage causes a spark to jump across the spark plug's gap, and the spark ignites the fuel in the engine. 1.3.4 Solution for overheated lawn mower ignition coil. Backfiring. If your vehicle is backfiring, this can indicate early symptoms of an ignition coil failure. Check a no-start. Beyond that, you can diagnose a bad coil by verifying that the rest of the ignition system is good, calibrated, and working properly. Start the mower when it is cold, and look through the window of the tester. It seems to me that if the stator was going bad or completely failed, you would have battery charge problems, as the stator (alternator) is what charges and maintains the charge of the battery along with the voltage regulator. Hard to start is from fuel leaking in or bad RV cover clearance or bad o-ring. Your exhaust may emit a black smoke and you may . 1.4 Symptom 04: The lawn mower comes to a halt halfway through the job. An ungrounded regulator would allow the battery voltage to shoot up and smoke coils. This created a rough idly and a motor that would not plane off. Even 1000 hours on a Slick will have the points pretty much burned out and the E-gap way off. Crank the engine and observe the end of the sparkplug. The silicone has a high enough of a breakdown voltage to fix the cracks. Low compression: Spark plug loose or damaged threads Air cleaner clogged, poorly sealed, or missing. The way to tell the . 1.5 Symptom 05: Engine cranks but won't start. In this video, WhizKid will show how to test if the Magneto is good or bad and how to replace a typical magneto. If you have been facing this for a long time, then probably your stator has gone bad. However, the problem is a charged condensor will also read infinity and that is normal. The key indicator is the suddenness of the drop. Post the model number or picture of the wiring if you have it. Holding the plug wire and seeing if a spark jumps to ground is inconclusive. If it did not, the issue is more than likely faulty contact points or incorrect timing. Copy. ,if shorted or open circuit,they are defective or leads bad. 1.3.2 Solution for outdated gasoline. Once the magneto is assembled, and the armature is rotated, the flux path varies between a relatively easy path as shown in Fig. Observe that there is a normal spark that allows the mower to run. From the symptoms and observed damage, I would suspect that the ball bearings corroded and finally failed. On a four-cylinder engine, it rotates at the same RPM as the engine. You'd certainly hear a big change in engine note if . If so, and there is no spark, then the coil is bad. It resembles a spark plug but has a sunken center electrode that simulates a load on the coil. If you are having problems starting your car it may be sign of a bad armature. 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. Step 4. Step 1 Spin your flywheel. Advertisement. 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. You also need to check all the battery, hot and ground wire connections. If there is no resistance at all, then it means that there is a break in either the primary . If a spark appears in the spark window on the tester or if the engine of the lawn mower suddenly starts, the starter coil is in working order. 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. Next, you should check the throttle/choke to be . If you get sparks continuously without any stop then that is intermittent spark or misfiring. With coil wire disconnected should have 4000-5500 maximum ohms secondary resistance between points wire and center output. Technician: T. Phoenix. 2 is the most difficult path the magnet has . This is a free and easy fix so try it out if your battery is still good. Loose wire connector. A 3000-hour Slick would have worn-out distributor bearings and worn plastic gears, and probably a worn-out carbon brush. Everything A typical bad plug will cause an immediate drop of 250 or more RPM, at the mag check. Many times stator problems are falsely diagnosed to other areas. Worth a call. If you are having problems starting your car it may be sign of a bad armature. Possible Cause: Worn pawls or stop pin. You may need to clean the connectors. We can rebuild/refurbish and upgrade any magneto for more output at the sparkplug. Pull the starter rope on the tiller and watch the gap on the spark plug for a spark. The engine will first struggle to turn over requiring two to three attempts to get started. There must be .010 to .020" play between drive gear and impulse coupling. 1. Trying to fix a Fairbanks Morse mag. If it did, you can just leave the test condenser in the circuit or remove . Remove the engine cover, locate the kill wire and unplug it first. , Technician replied 10 years ago. A few signs that your ATV's stator is bad include loose, faulty, or dirty connectors and a battery that will charge with a separate charger but not while the ATV is in use. 1 When the impulse fires, even with the mag switch set to Off or R the left mag light flashes, but with no tone. Sep 22, 2011. We toggle the magneto switches to find out whether one of the CDI ignition systems has failed. If so, grounding out the other (working) ignition circuit would kill the engine. Create a Battery-op Ignition System for Less Than $50: The cost of a new stator can be hundreds of dollars. This occurs when unused fuel is emitted through the exhaust system. The engine will first struggle to turn over requiring two to three attempts to get started. 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. If you check your inspection plugs and notice that the brushes are damaged, then the most likely cause is that the armature . Plug the free end of the tester into the original spark plug boot. Warnings. 1.3.1 Solution for Clogged Carburetor Bowl. 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. 7 Symptoms of Mercury Outboard Bad Stator. The spark plug is fouled and shorted to ground or is open and the magneto, which is functioning normally, is unable to fire it. 4. Let the engine run for about 30 seconds and then try another normal run up (at the normal run-up . Likely the coil or CDI. bluedogz Minister of Fire. Loose wire connector. If your vehicle will not start, it is possible there is a problem somewhere within the points and condenser. 3) Ignition coil,disconnect from CDI if possible,measure resistance to ground of primary,should be a few ohms,measure secondary resistance to . Push it in firmly to make sure there is a solid connection. Best thing to do is test your unit with the ohms meter. I have a 2002 Sportsman 500 that will not hit a lick. 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. The condensers last around 20,000 miles, so they do need to be replaced from time to time as a normal service item. A bad spark plug ignition cable will have a much higher than normal resistance. This is a result of the high-speed coil in the stator going bad. 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. It is rotated by a drive on the engine's accessory case. The spark plug is fouled and shorted to ground or is open and the magneto, which is functioning normally, is unable to fire it. Wiki User. battery not charging because fault with rectifier (might just be corroded terminals) bad connection to coils. Starter jet clogged or restricted. If you have a failing condenser, you could have hard starting issues and you could start burning the points. Start with the fouled spark plug possibility. Another symptom of Mercury outboard bad stator is that you will get a lot of weak park and misfire. 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). Let the engine run for about 30 seconds and then try another normal run up (at the normal run-up . Lots of parts up around Maine , New Hampshire. Remedy: Torque nut to 120-320 in-lbs on magnetos with attached drive gears. Eventually the engine will not start at all. Re: Stator Failure - Symptoms? the engine keeps running, or dies. First, find out what the resistance should be by looking it up in the bike's service manual. 3000 hours is a dangerously long time for a magneto to run without inspecting. cut out switch corroded. 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. Quick tip on showing how to fix a possible cause of weak or no spark on small engines! Engine stop switch stuck closed. Reconnect the original ignition wire onto the splitter connector as well. Air/fuel mixture incorrect: Idle air screw mis-set. The proper method to check for spark is with a spark tester. 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. Remedy: Inspect pawls and stop pin for wear. 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. Bad coil is also a possibility. If the spark is dim or not present at all, the tiller's coil is bad and needs to be replaced. There's a big mag shop down in Missouri or Oklahoma that overhauls Eisemann mags too. 10-25-2013, 07:32 PM. If you check your inspection plugs and notice that the brushes are damaged, then the most likely cause is that the armature . We manufacture new Super-mags and Sprintmags and supply the world with parts, drives and coils for the former Mallory product line. You have tried leaning and cleaning the plug to no avail. Study now. If you do, you will most likely destroy your mag. These will be signs that your stator is failing. The test for a short is easy, zero or a low resistance is bad. The spark plug is fouled and shorted to ground or is open and the magneto, which is functioning normally, is unable to fire it. Bad Stator Fix--Don't Buy a New Stator for Your Engine! Problem #1 is the leaking vacuum advance. I doubt the stator. Mark, Your FM-J mag on that engine should use R2437 points, R2477C coil, AXMR2433 condenser. The spark that appears each time you pull the starter rope should be bright and intense. You can find the appropriate range in the . The normal small drop in revs is irrelevant to this test; it's all-or-nothing, i.e. How do you find it? If you think it may be the magnet though then grab a rotor off Ebay and try it. I saw no apparent symptoms of a bad mag while flying prior to finding this. Might look in member directory for Matt Dunlap and his A&P son, lives in Michigan and they know Eisemann mags well. Misfiring is here intermittent spark. Make sure the condenser is not open . The symptoms you describe are classic "dying coil" symptoms. If you do not address the issue, you can also do serious damage to your exhaust, resulting in unnecessary and costly repairs. Then, compare that reading to the actual reading taken on the coil itself. Plastic covered coils can develop cracks in the casing or cracks can develop in wire coverings which lets the current . #3. You engine will probably not run as smoothly once you do get it started.. if it will start at all. The key indicator is the suddenness of the drop. Most small lawn mowers, chain saws, trimmers and other small gasoline engines do not need a battery. They tend to fail in a variety of ways though, some slowly, others all at once. Instead, they actually generate the power for the spark plug using a magneto. Magneto damaged. This result proves that the ignition coil is working. Suspect that the CDI module (stator) is bad and service manual says to replace it with a known "good" module. Incorrect jet sizes. bad plug bad ht cap or cable, , bad battery, needs a certain voltage to work magneto. Pull the hose off the advance and see if there is vacuum there. The bolt you remove threads into a smaller hole in the crank. Plug the hose and see if the miss goes away. We're also MSD Pro-Mag and Vertex dealers. . If it is of no use or has got damaged, then Mercury outboard stator replacement is a must for you.. Mercury Outboard Stator can also have some problems like the problems of Mercury outboard voltage regulator.. You can know the state of a stator by . Low compression: Spark plug loose or damaged threads This is the only light that lights in Off or R (other than the expected R light in R) 2. An open condenser will read infinity and is bad. Engine misfires, rough idle, and loss of power. Feb 3, 2004. Only show this user. Both the 2 and 3 need to be recharged periodically. The symptoms of a failing condenser may also be attributed to a poor ground or a compromised wire. On a six-cylinder engine, it spins at 1.5 times the engine speed. 2.when you speed up it wont go any faster than 3500rpm and stall, and if it does go up it will be erratic and engine will cut off. Thanks for Watching!! You have tried leaning and cleaning the plug to no avail. Feb 15, 2013 Suzuki SV 650 S Motorcycles 0 helpful 3 answers these are the symptoms you will face. My best guess would be a bad voltage regulator, bad ground connection on the regulator or a bad ballast resistor. I don't think the measurements you're taking have any relevance. 2012-01-11 14:43:11. At this point you should remove the carburetor and clean it, and also check the fuel system for any potential clogs. Air/fuel mixture incorrect: Idle air screw mis-set. If the path of Fig. 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. Start with the fouled spark plug possibility. Dec 10, 2011. The opposite can also happen with the low-speed coil. Aug 1, 2018. Engine stop switch stuck closed. . CDI is a successor to the magneto based ignition systems evolved a century ago by Bosch of Germany (Their logo still shows a magneto). One of the most common symptoms associated with a faulty ignition coil is engine performance issues. Your new problem sounds like maybe an ignition coil. Also misfiring, bucking, and even . Incorrect fuel level. What is a magneto on a lawn mower? The spark would be weak and maybe intermittent. To test your stator and determine whether it is bad or not, use a multimeter to tell if the appropriate ohms are being produced. Here are some common symptoms that hint towards having failing points and condenser: 1. On condenser though go with the higher capacity if can find it SXY2433 is a NAPA FM200. Check continuity across the points to be sure they are breaking the circuit when open, and closing the circuit when closed. Measure the distance between the flywheel and the magneto; it is usually set from .010-inch to .012-inch. And second clean the magnents and and the coil it will revive a "dead coil". Magneto damaged. Start the engine and the misfiring should disappear. First, you should check the fuel level, if the level is too low the carburetor may not be getting enough fuel, if the fuel level is okay, there is a potential it could be a clog. ! You can disconnect the kill wire from the ignition coil and check for spark to be sure. Eventually the engine will not start at all. Incorrect fuel level. One of the symptoms of a bad lawn mower ignition coil appears when you are . FIE can also service, rebuild and flowtest your Enderle, Hilborn, Kinsler . Turn on the lawn mower. Correct as necessary. If you see a spark jumping the gap between the top of the sparkplug and the ground, there is sufficient spark. Air cleaner clogged, poorly sealed, or missing. If it doesn't fall within the acceptable range stated in the manual, replace the coil. Lay the plug down on the tiller. Incorrect jet sizes. Aug 13, 2014. Slow jet or air passage clogged or restricted. The spark is arcing in atmospheric pressure. The key indicator is the suddenness of the drop. These faults do not necessarily occur instantaneously, they may develop over time leading to a gradual deterioration of the spark output. 1.3.3 Solution for reservoir full of oil. We tested the capacitor on each and found one that was bad showing very low resistance. 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. References. 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). Starter jet clogged or restricted. Fuel Injection Enterprises, home of the Super-Mag and Sprintmag! Click to see full answer. The magneto has factory-lubricated ball bearings in it. 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. Other things which can cause reduction of magnet strength are temperature and vibration, and we suspect that when (a) fluctuations in the magnetic flux path, (b) an adverse external magnetic field, (c) elevated temperature and (d) vibration are combined, they perhaps have a synergistic effect. Best Answer. Attach the other wire of the test condenser to a ground. Used in lots of old trucks and farm equipment. A misfire is usually a sign of bad ignition and a spark plug or spark plugs could be causing this. If you get spark then you have a wiring issue or one of the safety/ignition switches is at fault. A typical bad plug will cause an immediate drop of 250 or more RPM, at the mag check. If the Electrex is put on backwards your engine will ignite before it should and thus make your engine run backwards. According to this, my spark gap is supposed to be 0.011-0.015". Mercury outboard stator is the core of power, energy, and spark for the engine and other parts.