Then, compare that reading to the actual reading taken on the coil itself. References. You engine will probably not run as smoothly once you do get it started.. if it will start at all. With coil wire disconnected should have 4000-5500 maximum ohms secondary resistance between points wire and center output. This occurs when unused fuel is emitted through the exhaust system. However, the problem is a charged condensor will also read infinity and that is normal. 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. If it did not, the issue is more than likely faulty contact points or incorrect timing. We're also MSD Pro-Mag and Vertex dealers. This is a result of the high-speed coil in the stator going bad. Starter jet clogged or restricted. Thanks for Watching!! An engine that doesn't start easily can be as a result of bad spark plugs. Your new problem sounds like maybe an ignition coil. Click to see full answer. Turn on the lawn mower. A typical bad plug will cause an immediate drop of 250 or more RPM, at the mag check. Air/fuel mixture incorrect: Idle air screw mis-set. 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. The spark plug is fouled and shorted to ground or is open and the magneto, which is functioning normally, is unable to fire it. This is best done in the shade or at night. 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. Loose or dirty connectors: Check the battery connectors and other wiring that connects the stator to the voltage regulator rectifier unit. Low compression: Spark plug loose or damaged threads Remedy: Torque nut to 120-320 in-lbs on magnetos with attached drive gears. If you think it may be the magnet though then grab a rotor off Ebay and try it. 1.3.2 Solution for outdated gasoline. Copy. Check a no-start. Backfiring. Likely the coil or CDI. The test for a short is easy, zero or a low resistance is bad. Plastic covered coils can develop cracks in the casing or cracks can develop in wire coverings which lets the current . The spark that appears each time you pull the starter rope should be bright and intense. Remedy: Inspect pawls and stop pin for wear. Correct as necessary. the engine keeps running, or dies. Magneto damaged. And second clean the magnents and and the coil it will revive a "dead coil". Warnings. If your vehicle will not start, it is possible there is a problem somewhere within the points and condenser. Advertisement. From the symptoms and observed damage, I would suspect that the ball bearings corroded and finally failed. Incorrect jet sizes. If you are having problems starting your car it may be sign of a bad armature. Study now. This created a rough idly and a motor that would not plane off. 1. The spark is arcing in atmospheric pressure. 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. Low compression: Spark plug loose or damaged threads The proper method to check for spark is with a spark tester. This module costs about $250 and I hate to order one with out knowing for sure that the CDI is my problem. 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. One of the symptoms of a bad lawn mower ignition coil appears when you are . This solution completely bypasses the stator by using a 12 volt battery to power the ignition system. A bad condenser will cause the ignition points to spark more heavily, and burn out sooner. You have tried leaning and cleaning the plug to no avail. 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. check connections to cdi unit. If so, and there is no spark, then the coil is bad. If you do, you will most likely destroy your mag. Step 1 Spin your flywheel. 1. your engine will idle alright and start up ok and when put in gear may or may not run and stall. . I have a 2002 Sportsman 500 that will not hit a lick. We toggle the magneto switches to find out whether one of the CDI ignition systems has failed. Post the model number or picture of the wiring if you have it. 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? #3. Instead, they actually generate the power for the spark plug using a magneto. Let the engine run for about 30 seconds and then try another normal run up (at the normal run-up . Engine stop switch stuck closed. Your exhaust may emit a black smoke and you may . If you get sparks continuously without any stop then that is intermittent spark or misfiring. Only show this user. ! The symptoms of a failing condenser may also be attributed to a poor ground or a compromised wire. Also misfiring, bucking, and even . There must be .010 to .020" play between drive gear and impulse coupling. Incorrect fuel level. Air/fuel mixture incorrect: Idle air screw mis-set. A bad spark plug ignition cable will have a much higher than normal resistance. Start the mower when it is cold, and look through the window of the tester. Plug the hose and see if the miss goes away. How do you find it? Engine misfires, rough idle, and loss of power. My best guess would be a bad voltage regulator, bad ground connection on the regulator or a bad ballast resistor. The key indicator is the suddenness of the drop. The silicone has a high enough of a breakdown voltage to fix the cracks. The way to tell the . Pull the starter rope on the tiller and watch the gap on the spark plug for a spark. The symptoms you describe are classic "dying coil" symptoms. The spark plug is fouled and shorted to ground or is open and the magneto, which is functioning normally, is unable to fire it. Possible Cause: Worn pawls or stop pin. An open condenser will read infinity and is bad. If your vehicle is backfiring, this can indicate early symptoms of an ignition coil failure. It is rotated by a drive on the engine's accessory case. Engine stop switch stuck closed. 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. Air cleaner clogged, poorly sealed, or missing. Lay the plug down on the tiller. Incorrect jet sizes. Only show this user. . If you have a failing condenser, you could have hard starting issues and you could start burning the points. On a four-cylinder engine, it rotates at the same RPM as the engine. Aug 13, 2014. Even 1000 hours on a Slick will have the points pretty much burned out and the E-gap way off. If the path of Fig. Best thing to do is test your unit with the ohms meter. This is often accompanied by a loss in engine power. #2. Start the engine and the misfiring should disappear. If you check your inspection plugs and notice that the brushes are damaged, then the most likely cause is that the armature . Technician: T. Phoenix. B. . You have tried leaning and cleaning the plug to no avail. Ok several things can make an engine hard to start. Spin a magneto both with and without a condenser and the spark may be almost non-existent without the capacitor. 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). Problem #1 is the leaking vacuum advance. It resembles a spark plug but has a sunken center electrode that simulates a load on the coil. Outboard ignition coils, sometimes called coil packs, supply the high voltage required to fire spark plugs. A misfire is usually a sign of bad ignition and a spark plug or spark plugs could be causing this. Start with the fouled spark plug possibility. pogobill. Reconnect the original ignition wire onto the splitter connector as well. This is the only light that lights in Off or R (other than the expected R light in R) 2. To test your stator and determine whether it is bad or not, use a multimeter to tell if the appropriate ohms are being produced. Does anybody have experience with seeing how a bad capacitor effects engine performance? 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. Correct as necessary. Mercury outboard stator is the core of power, energy, and spark for the engine and other parts. I saw no apparent symptoms of a bad mag while flying prior to finding this. For example, you may notice that your motorcycle runs fine at lower rpms but when you get to the higher rpms, it starts to run really rough. You can find the appropriate range in the . On a six-cylinder engine, it spins at 1.5 times the engine speed. Create a Battery-op Ignition System for Less Than $50: The cost of a new stator can be hundreds of dollars. If you get spark then you have a wiring issue or one of the safety/ignition switches is at fault. 1 When the impulse fires, even with the mag switch set to Off or R the left mag light flashes, but with no tone. Start with the fouled spark plug possibility. Something to check on. Hard to start is from fuel leaking in or bad RV cover clearance or bad o-ring. If it doesn't fall within the acceptable range stated in the manual, replace the coil. The key indicator is the suddenness of the drop. Aug 1, 2018. Quick tip on showing how to fix a possible cause of weak or no spark on small engines! Next, you should check the throttle/choke to be . You may need to clean the connectors. If you see a spark jumping the gap between the top of the sparkplug and the ground, there is sufficient spark. Misfiring is here intermittent spark. Many times stator problems are falsely diagnosed to other areas. Holding the plug wire and seeing if a spark jumps to ground is inconclusive. One of the most common symptoms associated with a faulty ignition coil is engine performance issues. If you have been facing this for a long time, then probably your stator has gone bad. The voltage causes a spark to jump across the spark plug's gap, and the spark ignites the fuel in the engine. Crank the engine and observe the end of the sparkplug. 7 Symptoms of Mercury Outboard Bad Stator. Let the engine run for about 30 seconds and then try another normal run up (at the normal run-up . You'd certainly hear a big change in engine note if . If you check your inspection plugs and notice that the brushes are damaged, then the most likely cause is that the armature . Eventually the engine will not start at all. 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. Check continuity across the points to be sure they are breaking the circuit when open, and closing the circuit when closed. When the stator goes bad, it usually produces these symptoms: Weak Charging Voltage - once the stator starts going bad, it will gradually produce less and less voltage while the engine is running No Charging Voltage - if the stator burns out and fails, the ATVs alternator will stop charging the battery completely We manufacture new Super-mags and Sprintmags and supply the world with parts, drives and coils for the former Mallory product line. Slow jet or air passage clogged or restricted. cut out switch corroded. Both the 2 and 3 need to be recharged periodically. Another symptom of Mercury outboard bad stator is that you will get a lot of weak park and misfire. Bad Stator Fix--Don't Buy a New Stator for Your Engine! An ungrounded regulator would allow the battery voltage to shoot up and smoke coils. Magneto damaged. 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. A 3000-hour Slick would have worn-out distributor bearings and worn plastic gears, and probably a worn-out carbon brush. 2). The condensers last around 20,000 miles, so they do need to be replaced from time to time as a normal service item. In this video, WhizKid will show how to test if the Magneto is good or bad and how to replace a typical magneto. Eventually the engine will not start at all. 1.4 Symptom 04: The lawn mower comes to a halt halfway through the job. Vehicle not starting. A typical bad plug will cause an immediate drop of 250 or more RPM, at the mag check. 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. 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. Dec 10, 2011. 4. Engine oil does not reach them. Worth a call. The magnet retains its magnetism for years, and is re-magnetized when the magneto is opened up for repair or overhaul. Everything… If it did, you can just leave the test condenser in the circuit or remove . A typical bad plug will cause an immediate drop of 250 or more RPM, at the mag check. If the spark is dim or not present at all, the tiller's coil is bad and needs to be replaced. The engine will first struggle to turn over requiring two to three attempts to get started. 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 plug bad ht cap or cable, , bad battery, needs a certain voltage to work magneto. Used in lots of old trucks and farm equipment. ∙ 2012-01-11 14:43:11. Mags came off for 500 hour inspection. Loose wire connector. Ignition Coil for Johnson Evinrude Outboard. CDI is a successor to the magneto based ignition systems evolved a century ago by Bosch of Germany (Their logo still shows a magneto). These faults do not necessarily occur instantaneously, they may develop over time leading to a gradual deterioration of the spark output. Shackelchevy77 said: Before you decide that a coil is bad two problems i have noticed. When low spark is detected on a plug, it might be time to replace a coil. The service manual has a diagnosis procedure for the ignition module. This is a free and easy fix so try it out if your battery is still good. 1.5 Symptom 05: Engine cranks but won't start. 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. The opposite can also happen with the low-speed coil. Might look in member directory for Matt Dunlap and his A&P son, lives in Michigan and they know Eisemann mags well. Pull the hose off the advance and see if there is vacuum there. , Technician replied 10 years ago. Advertisement. This result proves that the ignition coil is working. If you are having problems starting your car it may be sign of a bad armature. Without a good stator, your engine will run poorly or not at all. Attach the other wire of the test condenser to a ground. The spark would be weak and maybe intermittent. The M20 bottoms on the end of the crank providing pressure that pops the rotor off. ,if shorted or open circuit,they are defective or leads bad. 2 is the most difficult path the magnet has . 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. We can rebuild/refurbish and upgrade any magneto for more output at the sparkplug. The engine will first struggle to turn over requiring two to three attempts to get started. Observe that there is a normal spark that allows the mower to run. What is a magneto on a lawn mower? Step 4. First, find out what the resistance should be by looking it up in the bike's service manual. FIE can also service, rebuild and flowtest your Enderle, Hilborn, Kinsler . Push it in firmly to make sure there is a solid connection. Wiki User. That was a real pain for me. Bills86e Premium Member Premium Member Apr 24, 2010 #6 Most small lawn mowers, chain saws, trimmers and other small gasoline engines do not need a battery. You can disconnect the kill wire from the ignition coil and check for spark to be sure. These will be signs that your stator 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. If there is no resistance at all, then it means that there is a break in either the primary . Remove the engine cover, locate the kill wire and unplug it first. 1.3.1 Solution for Clogged Carburetor Bowl. I doubt the stator. 3000 hours is a dangerously long time for a magneto to run without inspecting. Make sure the condenser is not open . They tend to fail in a variety of ways though, some slowly, others all at once. 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). Bad coil is also a possibility. 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. The normal small drop in revs is irrelevant to this test; it's all-or-nothing, i.e. 5. Sep 22, 2011. Incorrect fuel level. We tested the capacitor on each and found one that was bad showing very low resistance. Mark, Your FM-J mag on that engine should use R2437 points, R2477C coil, AXMR2433 condenser. 1.3.3 Solution for reservoir full of oil. 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. bluedogz Minister of Fire. On condenser though go with the higher capacity if can find it SXY2433 is a NAPA FM200. Loose wire connector. If so, grounding out the other (working) ignition circuit would kill the engine. 1.3.4 Solution for overheated lawn mower ignition coil. Oct 9, 2011 Slow jet or air passage clogged or restricted. Feb 3, 2004. Once the magneto is assembled, and the armature is rotated, the flux path varies between a relatively easy path as shown in Fig. If you do not address the issue, you can also do serious damage to your exhaust, resulting in unnecessary and costly repairs. Suspect that the CDI module (stator) is bad and service manual says to replace it with a known "good" module. Re: Stator Failure - Symptoms? Feb 15, 2013 • Suzuki SV 650 S Motorcycles 0 helpful 3 answers You also need to check all the battery, hot and ground wire connections. Here are some common symptoms that hint towards having failing points and condenser: 1. I don't think the measurements you're taking have any relevance. Beyond that, you can diagnose a bad coil by verifying that the rest of the ignition system is good, calibrated, and working properly. If the Electrex is put on backwards your engine will ignite before it should and thus make your engine run backwards. Starter jet clogged or restricted. The magneto has factory-lubricated ball bearings in it. 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 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. 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. At this point you should remove the carburetor and clean it, and also check the fuel system for any potential clogs. 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. battery not charging because fault with rectifier (might just be corroded terminals) bad connection to coils. these are the symptoms you will face. Trying to fix a Fairbanks Morse mag. 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 . 3) Ignition coil,disconnect from CDI if possible,measure resistance to ground of primary,should be a few ohms,measure secondary resistance to . Measure the distance between the flywheel and the magneto; it is usually set from .010-inch to .012-inch. There's a big mag shop down in Missouri or Oklahoma that overhauls Eisemann mags too. Best Answer. I do the cover removal. According to this, my spark gap is supposed to be 0.011-0.015". The key indicator is the suddenness of the drop. Air cleaner clogged, poorly sealed, or missing. High fuel consumption could also be an indication, as weak spark decreases engine efficiency. The bolt you remove threads into a smaller hole in the crank. Lots of parts up around Maine , New Hampshire. 10-25-2013, 07:32 PM. 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). Plug the free end of the tester into the original spark plug boot. Fuel Injection Enterprises, home of the Super-Mag and Sprintmag!
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