How to test a cdi box on a mercury outboard. Watch for a spark and observe its character.

Disconnect the Mercury Outboard switch and reset, if the engine fires, replace the Mercury Outboard switch. CDI P/N: 114-7778. May 25, 2018 · Cdi Switch Box for Mercury Marine Power Pack V-135 / V-150 /V-150 XR2 /XR4 /V-150 XR6 / V-175 / V-200/V-220 ; Cdi Switch Box for 322-7778 mercury 3 cylinder /6cyl /blackmax 175hp power pack ; Compatible with many models, please see the detailed description ; The CDI Switch box for Mercury Outboard Come w/Ground Wire Attached May 19, 2011 · The first step is to do a Ohms test to see if the coil is good before going on to the visual internal ferrite core inspection. Pull the starter and you should see 500 volts on the voltmeter. to the spark plugs at just the right time. Warning! This product is designed for installation by a professional marine mechanic. This is how the CDI box looks now. at 1500 7v. They seem to be one of the mo Switchbox installs can a bit intimidating given all of the wires and connections involved. I posted recently after rebuilding the ignition system of one of these phase maker 7. 511-7800 Remote Starter Controls most Mercury engines from 1970 thru 1978. A faulty or failing switchbox can cause one or more symptoms. This setting allows you to measure the resistance of a circuit. First half of video is how to replace a power pack and the second half is how to di Connect the wire to the base of a load resistor. pulser1w/r-w/y. 4. Osgood Company for RV and Upper Midwest Marine Sales Representation Jan 29, 2019 · This video demonstrates how to perform a basic test on a mercury outboard Inline 6 Trigger 1979-1988. The part number is 332-4911 I think it is the A8. With your ohm meter, measure the coil ground to the secondary (where the spark plug wire goes). Using the Fluke meter with the 511-9773 peak reading adapter (or CD-77), measure DVA voltage of the stator from the black/yellow wire to engine ground with everything connected. 00. Junior Member. 511-7900 Remote Starter Controls most Mercury engines from 1979 thru 2000. It is actually very simple and easy. TROUBLESHOOTING THE CDI MODULE No Fire on Any Cylinder: 1. I have a 1999 25 HP Mercury manual start outboard. This Switchbox replaces these P/N's: 332-5524, 332-7778A1, 332-7778A3, 332-7778A5, 332-7778A6, 332-7778A9, and 332-7778A12. M. IF, these are CDI boxes it is allowed to replace only the one box. Select the resistance scale on the multimeter. When the outboard engine fails or refuses to run, most likely it happens because of an Jun 10, 2015 · In this video I go through testing the CDI ignition on and outboard motor to diagnose any faults such as a no spark situation. If you're turning your key and the starter motor isn't cranking then you may have a faulty solenoid. com. to/3OfW This is one way to bench test a switch box and you also can do this on the outboard motor May 12, 2020 · In this video I will walk you though all the steps involved in troubleshooting a CDI ignition system in a Mercuy outboard motor. Dec 7, 2016 · CDI Electronics | Outboard Motor Parts | Ignitions | Marine Sep 9, 2013 · Re: Mercury Outboard Switch Box Failures. 130v at 1500 b/w-b. Sep 17, 2023 · Switch box for mercury outboard 4 6 cylinder 50-150 hp 67-79 cdi 114Switch box for mercury mariner outboard 6 8 9. Nov 1, 2023 · Switch box for mercury mariner outboard 6 8 9. Following the steps outlined earlier, such as checking for continuity and resistance, you can determine if your CDI box is functioning properly. Mercury Mariner ignition module diagrams, switch box replacement parts, and repair manuals. Locate the CDI Box and Remove. May 1, 2009 · Re: mercury ignition switch box. Hi everyone new user here. This is a 1974 Mercury 650e, Mar 26, 2021 · 1. / blue= 180 + v. Hot and cold measurement of cdi box with a multimeter; Safety when using a multimeter on a cdi box; And so much more! Mar 28, 2023 · Symptom 1: No Spark. Nov 30, 2023 · Why your mercury outboard motor stopped working Mercury outboard switch box bench test Mercury outboard. In technical terms, reduced spark energy causes issues with the engine start-up. Now, you can test the CDI box by touching the probes to the terminals on the box. Set your multimeter to continuity (or ohms) mode for the cold test. Connect a spark gap tester to the spark plug wires and check for fire on all cylinders. Check the ignition coil secondary resistance Aug 11, 2007 · The switchbox is one of those items that is tested by proving "nothing else is wrong". Brand: Automotive Authority LLC. com blog, we will show you: Symptoms of a defective CDI box. Flywheel. Jul 11, 2015 · I have done this test on my 94' Mercury 60 hp motor. Aug 6, 2021 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Aug 22, 2018 · All Mercury Forums; Mercury Outboard Parts Forum; If this is your first visit, be sure to check out the FAQ by clicking the link above. The hierarchy of spark is like so:* The INCOMING Apr 18, 2013 · Re: 1974 Mercury Thunderbolt 7. most common possibility if all inputs are in spec would be the kill switch ( man over board) is activated (grounded) Joshmason808. All checks are made with a peak reading volt meter. Jul 23, 2022 · The symptoms of the bad stator are usually similar to the below-mentioned and explained indications: 1. #1. The needle should move to the right and stay in the green area. Jul 28, 2015 · Jul 28, 2015. Chart A shows voltage and current reading of a standard rectifier. From what I understand I have a CDI ignition system, it's got the switch box (which I think Mercury call the Thunderbolt or Thundeerbox or something like that), the 4 top connections are from the stator. If so then go on to the visual Mar 4, 2024 · Step 3: Set the Multimeter. Check the resistance from each of the yellow wires to case ground, you should get a reading of about 56K (56,000) on one and a high reading on the other. Hey guys, I am having an issue that Im starting to think could be ignition related and would like to know how to test a CDM module (coil pack) on my 2002 Mercury 75hp. 9,10,15,20,25,35 HP 2-Stroke 1980-1996: Electronic Ignition - Amazon. Not so hard after all. Set your multimeter to the “Ohms” setting. CDI Electronics manufactures many different test harnesses to aid. News. Turn the motor over one time only, either with the recoil starter or the electrical starter. Dec 17, 2022 · Here are the steps to test a CDI box with a multimeter: Disconnect the negative terminal of the vehicle’s battery to ensure safety. You should get a reading of about 45K (45,000) on one and a high reading on the other. The spark must occur at the precise moment the piston has fully To install and test a Mercury Outboard external wiring harness, the first step is to locate and remove the old wiring harness. It may be cutting in and out after half throttle that I am noticing, originally thought it was fuel related but I have done everything there is to do on that May 1, 2017 · 7. Oct 4, 2016 · News. Your outboard switchbox sends voltage to your ignition coils or CDM's to provide a good spark. $403. 5 hp , switch box test , wiring? Laddies said: Your engine is a ground off engine and will not have spark with the orange wire grounded. Sep 11, 2016 · Video shows how to check or troubleshoot the trigger or CDM module on an ignition system that came off an outboard Mercury Force 40 HP motor. Once I diagnosed a partial weak to eventually “no spark” condition i May 19, 2021 · What do you check if your outboard has a spark but won’t start?In this installment of our series on your outboard ignition system, we’re going to guide you t Jul 15, 2023 · If interested in purchasing this product, visit our Amazon affiliate link below. 5/s. That is all I know about the motor I just got it. In the mean time I found a website that shows what you should see on every CDI/ power pack and on which lead you should see it. But it's primary function is to store and convert power from the stator. Then the trigger voltage should be 2-10VDC. Watch for a spark and observe its character. Bench Test Diode plate check: Test the forward diodes between the two yellow wires and the red wire. | Search this page. The needle on the multimeter should move when you touch the probes together. CDI Electronics cannot be held liable for injury or damage resulting from improper installation, abuse, neglect, or Feb 3, 2023 · Step 1: Locate the CDI box And Remove. Next. Mercury Outboard Inline 4 New Stator & CDI Trigger Install - YouTube. blue/white stripe for the low speed change coil. Notes: (a) = Blue to blue/white may read 600 W for some Rapair/CDI Electronic stators. Test can be performed while the Trigger is on the motor An outboard’s ignition system is responsible for producing an electrical spark to ignite the mixture of fuel and air within the cylinder (s). Troubleshooting tips: Mercury Mariner switchbox problems, Mercury switch box replacement, troubleshoot Mariner switchboxes, Mercury Mariner ignition components. If the voltage is less than 9 1/2 volts during cranking there is a problem in the battery s or the Ignition switch Box. Stator Kit for Mercury 16 Amp 2 3 4 Cyl 40-125 HP 1987-99 398-818535A18. So to bypass the kill switch take the Sep 8, 2010 · 1. Test the load resistor's positive and negative terminals with the positive and negative terminals of a multimeter. You can check for output on the switchbox, which should be the same as the higher stator voltage. This box is connected with multi wires. Check Details. You really need to get one if working on your motor yourself. Jul 7, 2022 · The CDI unit or ignition box is responsible for storing spark from the stator and transferring it to the ignition coil via signal from the trigger. For more details watch CleanCarburetor movie How to test power pack. This switch box replaces these P/N's: 18-5881, 332-5772A1, 332-5772A2, 332-5772A3, 332-577A4 and 332-5772A5. cdi out 95v cranking loaded. Jun 6, 2014. Outboard Motor Parts for Mercury Outboard / Mariner CDI CD Ignition, Switch Box #114-6222. Does anyone know how to ohm test the switch box. Understanding this chart: Example: Grn = Green Wht/Grn = White/Green Sep 19, 2012 · With a Fluke Meter set on DC Voltage equipped with a DVA or Peak Reading Adapter, stator and pack output can be quickly checked. Mercury switch box wiring 3322986 (2 of 3) Cdi electronics® 114-4796Mercury outboard switch pack test, "working" Switch box for mercury mariner outboard 6 8 9. The multimeter reading you get will not be a steady reading. This can prevent one or multiple cylinders from receiving enough voltage or sparks, causing a rough start or run and misfiring. Grab the multimeter’s leads and join them together. $282. This chart assumes you have the adequate testing equipment to diagnose ignition problems. Our Mercury Outboard Switch Box are at the lowest prices and same day shipping! Aug 11, 2011 · Slide Anchor Box Anchors Shop Mercury & Mariner Outboards Mercury 150hp stator test-- help-- !!!!! CDI has very good instructions on testing and diagnosing . Your "test" seems to prove it is doing that at least to some degree. Additionally, the tester can be used to test Mercury Outboard EFI injectors. HS = High Speed. If the voltage is still low, then you'll need to replace your outboard's power packs. For more details watch CleanCarburetor Mar 7, 2017 · SUBSCRIBE! This is how to diagnose and replace a bad outboard power pack. See if it is around the 1KΩ or 1000Ω range. If you see continuity, the switch has failed and needs to be replaced. Reconnect the red wire (that went to the old CD) to the rectifier battery terminal or tape off as it is no longer needed. In the case of a two-stroke motor, the fuel and air mixture also contains a small amount of oil to provide lubrication for the engine. Replaced switchbox/power pack - still no spark. Remote starter harnesses are ideal for isolating the engine under. OE#: 339-6222A10, 332-5772A1, 332-7552A2, 332-7552A3, 3395287. Use a jumper wire and short the orange (Salmon) wire to ground. In addition it works with Yamaha snowmobiles and personal Jun 6, 2014 · New member. I don't know if this procedure will work the same with your engine. The ignition switch sends a signal to the solenoid when you turn your key allowing it to open; this allows voltage from your battery to pass through it to the starter motor. It can be used to test the CD module, distributor cap, Ignition coil and plug wires. If the stator and flywheel are still on the engine, connect the positive side of your voltmeter to the green stator wire, and the negative to engine ground. com FREE DELIVERY possible on eligible purchases Check Details Check Details. Sep 25, 2009 · Thanks. Need some motor help. CDI Electronics | Outboard Motor Parts | Ignitions | Marine 20V+ HS 180V +LS. This box is black and located near the engine underneath the seat of the motorbike. You may have to register before you can post: click the register link above to proceed. Tested kill switch and it was fine. Crank the engine and carefully tap the jumper to engine ground, if the coil fires Jul 31, 2021 · This is how to troubleshoot your outboard's kill switch circuit. / each trigger wire +4+ v. Most probably, a backdated outboard motor tends to face complications during the engine start-up. To start viewing messages, select the forum that you want to visit from the selection below. A good, strong spark means the air and fuel mixture in the cylinder will be ignited properly. Every wire is color coded to Jan 3, 2024 · Mercury Mariner 80's CDI outboard ignition Part 2: switch box/power. 150V+. Installs with a easy direct plug & play application. Merc V6 Models 150 HP, 175 HP & 200 HP ser # 5124981 to 5363918 ( IMAGE) Merc V6 Models 150 HP, 175 HP & 200 HP ser # 5363919 to 5464484 ( IMAGE) Merc V6 135 1985-88, 150 1979-88, 175 1980-88, 200 1979-88, 220 CARB 1986-88 ( IMAGE) WIRING DIAGRAMS ARE HERE FOR MANY MERCURY OUTBOARD MOTORS. The switchbox (s)are energized by the stator under the flywheel. Sierra 18-5791 Switch Box. Specialized harnesses for Johnson / Evinrude, Mercury Marine, and other brands are available to the service professional. pulser 2 w/b-w/g. May 1, 2017. (See attached photos) 2. 511-6996 Remote Starter Controls most Johnson/Evinrude engines from 1969 thru 2006. Osgood Company for RV and Upper Midwest Marine Sales Representation About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Jul 23, 2022 · Symptom 1: Engine Not-starting. Thank you, guys. wmv Basic ignition system. It came off a 40 hp mercury marine serial number 5367818. Set the multimeter to ohms, then touch the negative side to a ground and the positive to the wire coming to the CDI. Smaller outboards have a switch on the tiller handle with a wire running to the CDI, which is basically a ground for the test. After clamping your multimeter you have to test yellow and pink wires in turn. A digital multimeter will produce a beeping sound when you do this, which confirms continuity. While testing and probing at the end of the cable, it is recommended to try cranking your bike for a few seconds. The cold test method is for testing a CDI system’s continuity. 9 10 15 20 25 hp 2strMercury switch outboard wiring diagram box key motor test classic engine Mercury switch box mariner outboard hpMercury quicksilver outboard motor control box w/ tilt/trim switch 14. 2 - take it to a shop and have the troubleshooting done by Sep 25, 2020 · How to test a coil on an outboard engine. 38 ohms and 0. Edition ignition outboard practicalIgnition system troubleshooting Ignition outboard cdi module boats May 30, 2013 · CDI’s Regulated Rectifiers is a direct replacement for Johnson/ Evinrude and applicable to many Mercury Marine outboard engines. If some cylinders fire and not Jul 5, 2024 · Learning how to test outboard cdi box with multimeter is a straightforward process that can help diagnose potential issues. Switch box for mercury outboard 4 6 cylinder 50-150 hp 67-79 cdi 114Outboard saltwater mariner 90hp key diagrams 115hp schematics ignition marine tilt Switch box for mercury mariner outboard 6 8 9. Tilt Trim Motors. No Or Weak Spark: No spark or sometimes visibly weak spark is the root sign that directly indicates that you need to check on the condition of the stator. 3 Different types discussed: 1967-1978, 1976-197 Sep 20, 2017 · Replac Mercury Power Pack, for mercury cdi 332-5772a7,mercury outboard switch box 332-5772a1, mercury switch box 332-5772, 85 mercy 50hp, switchbox mercury classic 40 hp 45hp 50hp,1989 mercury 4 cyl switch box，115 merc cdi switch box for 2 stroke 4 cylinder Mercury motor，Solved spark problems Jun 25, 2012 · I searched the forums here and found the issue with my power pack. Mercury 200 efi fuel pump problemsSell 20hp 2003 mercury outboard cdi box in canada, canada, for us $149. Mercury Outboard Home Page. 3. 99. $5299. Water Pumps. Go here May 23, 2007 · 262 posts · Joined 2001. And the ignition coil failure is the main cause of it. 2. (Excludes Japanese Mariner models) Performing tests on ignition components requires that you have the proper equipment to do so. Chart B shows the more stable voltage and current reading on a regulated rectifier. MEDS works with most Honda, Evinrude, Yamaha, Suzuki, Mercury, MerCruisers, and many other low-emission gasoline engines. Check Out. My motor ran the same without the two yellow leads hooked up to the voltage regulator/rectifier. Most Mercury Outboard Ignition systems use a red Wire and/or red/white stripe for the high speed charge coil, and blue and/or. If it happens pretty much regularly instead of occasionally, the engine will Remove the high tension lead from the original coil and distributor cap. resistance is 330 ohms. 78 ohms. Clip off the ring terminals from the white wire on the ignition side (the side with 4 terminals), and the brown, white and black trigger wires. 5 hp Mercury was priced right for what the owner thought was a fuel issue. Check for broken or bare wires on the unit, stator and trigger. Apr 17, 2022 · Once the wires are in place, you can turn on the multimeter by turning the knob on the side. The k Nov 23, 2017 · How to diagnose a no spark on an outboard motor Feb 15, 2004 · Check stator voltage (200-300VDC on the blue lead and 29-90VDC on the red lead) cranking the engine. Switch boxes on Merc's (unlike the powerpacks on OMC's) are not overly prone to failure - at least at nowhere near This little 7. Aftermarket switch box for mercury motors. FREE Returns. Sep 1, 2020 CDI Electronics Receives Supplier of the Year Award from the NMDA; Jun 2, 2017 CDI Electronics and Balmar Select S. Primary resistance should be less than 1 ohm, about 0. Place the positive probe of multimeter on the green and white striped terminal wire pin and the negative probe of the multimeter on the terminal pin for the red and yellow wire. Shop Mercury Outboard Switch Box at Wholesale Marine. Mercury mariner 80's cdi outboard ignition part 2: switch box/power. You have to press the probe that is at the cable’s end. The CDI 511-9701 Battery CD Tester is highly recommended due to its ability to fire the Ignition systems up to 3000 RPM without the engine running. Clean all battery connections and engine grounds. in troubleshooting most outboard engine brands. Two different t Mar 19, 2016 · 1 - invest the 30'ish bucks in a manual and go through the ignition troubleshooting procedures - since you say that you are not "mechanical" when it comes to outboards it could get quite cumbersome and confusing trying to explain the numerous checks and tests that you need to complete. If your boat won't start and has no spark the ignition kill switch circuit may be bad. This involves testing the resistance of the coils and leads as Sep 5, 2016 · A Yamaha service manual for your motor will have the specs and how to test. It takes 150+ volts supplied Essentially a remake of the Trigger Testing without uninstalling the distributor which can be a pain. Boat Stator, Mercury Marine Outboard, 398-5704A 7, 18-5865. CDI P/N: 114-5772. Disconnect the points wires from the ignition coils and connect a jumper wire to the negative side of the coils. #1 · May 23, 2007. If the engine starts, use the choke to kill it and replace the kill switch. Mercury outboard 50hp switch box cdi 18-5775 332-7778a3 7778a12 3/6cylMercury outboard 50hp switch box cdi 18-5775 332-7778a3 7778a12 3/6cyl Mercury switch box wiring 3322986 (2 of 3)Mercury outboard start even when kill switch is activated or kill. The lack of a spark to ignite the fuel mixture, which results in the engine not starting, is a common sign of a bad trigger. Hold the plug wire about 1/4 inch from the powerhead, not over the spark plug. Ignition coils: https://amzn. Outboard power packs supply high voltage power to the power coils of the outboard's ignition. Check the voltage on the red and white Ignition wires at the CD Unit. I earn from qualifying purchases. A two cycle engine fires each cylinder once per revolution. 511-9764 Apr 9, 2018 · Mercury Switch Box CDI Power Pack 855713A3, 855713A4 114-5713, C117. Ignition outboard works cdi pulser components Home made cdi for outboard. 9 10 15 20 25 hp 2strSwitch mercury outboard box mariner hp marine. LS = Low speed. The test was designed to isolate the alternator from the ignition system so that the voltage must come from the start battery. CDI cannot be held liable for injury or damage resulting from improper installation, abuse, neglect or misuse of this product. 99 Mercury cdi box köpMercury marine v-200 hp xri (efi) detonation controller / temperature. Start by locating the old wiring harness on the boat. Mercury Outboard CDI CD Ignition, Switch Box #114-6222. This can be a sign that the ignition trigger is not sending the signal Nov 21, 2014 · The program is truly a plug-and-play design as it automatically senses what make and model and displays the information and testing procedures unique to that engine. Find the model number of your CDI/ power pack 2. Your original question was how to test the box, start with buying a DVA then disconnect the black/yellow lead from the box next test the inputs from the stator inputs red =25v + v. Disconnect the mercury tilt switch and retest. 1. Occasiona Apr 23, 2014 · 511-5207A 1 CDM Test Harness Test the CDM Module DVA on the engine and isolate the kill circuit. Nov 5, 2007 · Re: 60 HP Mercury/Tracker No Spark? If you use a OHM meter, first check the flywheel for screws to tell if the magnets a screw in or glued then peek up under the flywheel and see if you have a OEM stator it will be covered with plastic material either black or red in color or a CDI stator the winding will be exposed then goto the test for the stator on the engine and it tells where the red and Feb 27, 2024 · This is effectively a gate. Locate the CDI box. This short video shows an outboard Force by Mercury Marine with the power pack replaced. Jan 21, 2024 · Check Details 332-7778a 3 mercury mariner outboard switch box 75-200 hp 332-7778a 6. Jan 30, 2019 · Quick Video on the evolution of Merc Inline Ignition Coils (1967-1988) and how to perform a resistance test. 332-2986A21 Switch Box Assy $ 634. - - - - - - - - - - - -Due to factors beyond the control of FixItSam, it cannot guarantee against unauthorized mod 3 days ago · Trying to see how to test a cdi box with a multimeter? Super, you are in the right place! In this ToolsGaloreHQ. Just want to show you guys that its not impossible to repair a CDI box, i have found the problem on it whit the cables and some of the components,but it took 1 hour to get down there and im not finished yet from the other side the electric parts can be found on www. This is an important step in the process as it allows for a clean installation of the new harness and ensures proper electrical connections. Apr 29, 2020 · Buy JETUNIT 339-7452A19 Switch Box CDI Power Pack for Mercury Outboard 18-5777 114-7452K 1 339-7452A1 7452A7 7452A15 7452A18 6,8,9. The first step of how to test the CDI box with a multimeter is to locate the CDI box in the motorcycle. One day it was working fine, the next nothing. When a spark test fails on one side of the motor, disconnect the Bias wire and retest. and each output should be 150 volt. Strip Dec 29, 2023 · Check Details Mercury outboard switch box bench test. Apr 21, 2023 · Check Details Mercury mariner switch box cdi 15 20 25 hp 18495 a9 a14 a16 a17 a20 a21. Mercury/Mariner DVA (Peak reading) and Resistance charts. Add to Cart. 8 33 ratings. test from the vessel. In this video im explaining how the mercury/mariner cdi powerpack / switchbox / etc works in lay mans terms. Quickly determined that there was no spark on either plug. Meter Test: 1. It is usually found near the engine or under the seat of the vehicle. The orange wire from the switchbox fed to the yellow wire from the stator screw terminal, the wire for the kill switch was attached here. This switch box meets or exceeds OEM specifications. Mercury Outboard 2 Cylinder Switch Box, 4 - 20 HP. Hey guys! I have a fairly straight forward diagnosing process for diagnosing the no spark on these switch box years of Mercury. This test will quickly diagnose if you have a defective Switch Boxes. 9 10 15 20 25 hp 2str '97 332-7778a1 7778a3 mercury mariner force outboard switch box 75-200 hpMercury inline 6 coil/trigger/switchbox test no spark test. Mercury Outboard Motor Stator and Switchbox output check with DVA Nov 11, 2019 · How a 2 stroke outboard ignition system works The way these ignition system work more or less is that you have a magnet on the flywheel so as you start the outboard by using the pull start or turning the starter motor the flywheel starts to spin as a magnet in the flywheel passed into this pulser coil the magnet induces our current into that coil so a small current flows through the coil Jul 18, 2022 · This is part 1 of a series of videos I am putting together on how to diagnose and repair a small 2 stroke mercury outboard which has "no spark". If the ignition works properly, replace the mercury switch. elfa. Then the 3 connectsions on the left side are from the trigger, and the 3 connections from the right side go to the coil. Disconnect the black/yellow kill wire AT THE PACK. a peak reading voltmeter for CDI systems is needed (or a DVA adapter and regular meter)to check inputs and out puts of the CDI to make sure they meet spec. Repeat this for each spark plug wire. If spark is restored then the box that WAS sparking has a bad Bias circuit and is blocking spark on the other box. Replaced spark plugs, nothing. 9 10 15 20 25 hp 2str '97Tilt colis. I indexed top dead center for each cylinder by removing the spark plus and using a dial indicator Feb 22, 2016 · Cadet. ur ol ua ya uv mk uq yf ar wh