how to change spark plugs on 90 mercury outboard

NGK spark plugs are original equipment on many outboard motors and are excellent replacements for everyday engine maintenance. there are some tips and tools to make the job easier Changing the spark plugs on a 2006 Mercury 115HP EFI only takes a handful of minutes. Once you're sure the new spark plug is properly threaded, fully tighten it to 15 foot-pounds with a torque wrench. 2020 Boat of the Year: Axopar 28 Cabin. All Rights Reserved. © 2000-2020 Boats.net. You may also find the Champion spark plug code helpful. Service, Parts, Products ... 4-Stroke Outboard Spark Plugs; 2-Stroke Outboard Spark Plugs; Early Mariner Outboard Spark Plugs; Same mix I use for my two stroke Mercury 250 EFI. Do I need a special tool. I would probably go more by the hours usage than changing spark plugs once per year. Step 2. Tell me a bit more about what's going on so the Marine Mechanic can help you best. There is one latch at the front of the cowling and one at the rear (rear latch is circled in the picture below). Please view the application guide below. Step 5. A wet spark plug can indicate water in the fuel while a white residue on the plug can point to a plug that is too hot. Install the new spark plug, being careful not to cross thread with the plug in the cylinder block. - no more than 6 hours of use since. Could that be the case here? I have changed the gas in the gas tanks, and changed the two spark plugs. Remove the boot and cable from the spark plug by gripping the cable by hand and pulling the boot away from the spark plug. Replace the engine cowling and you're done! Replaced the fuel filter & spark plugs on our 'new to us' Mercury 90hp 3 cyl a few months ago. Check them and see if one or more have a heavy carbon build up, or wear to the electrode. Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. You may also find the NGK spark plug code helpful. 2004 mercury outboard won't start. But, always use anti-seize compound on the threads. 4 Wire Set Marine Spark Plug Wire Lead, Fits for Johnson Evinrude 90 115 HP, Outboard Engines OE Replacement 18-8839 9-28092, Premium Ignition Spark Plug Wire Set $21.99 $ 21 . Find spark plugs for your 2-stroke Mercury Mariner outboard using the application chart from the Mercury Quicksilver catalog. When to change your spark plugs. By John Tiger. Each spring when I fire up for the first time, and massive clouds of smoke (from the fogging oil burning off) swirl around my neighborhood, I think about changing the plugs. How do mechanics replace spark plugs? Champion spark plugs are original equipment on many outboard and inboard motors and are excellent replacements for everyday engine maintenance. Boats. What size tool do I need to replace the spark plugs in a Mercury 4 str - Answered by a verified Marine Mechanic We use cookies to give you the best possible experience on our website. Doesn't sound like it's getting gas. Remove the spark plugs. You may also find the NGK spark plug code helpful. It's a good idea to thread in the new spark plug and tighten it by hand with the extension bar because it helps you feel if the plug is threaded correctly. Five Years of Volvo Penta’s Forward Drive. Spark plugs checked and ok but not replaced. 1983 Family Owned. Then come back with your torque socket wrench and torque the spark plugs in at the amount listed in your outboard motor manual. PRO TIP: There are two spark plugs on a Mercury 20HP 4-stroke outboard, and it's important that the cables are attached to the correct spark plug. Champion spark plugs are original equipment on many outboard and inboard motors and are excellent replacements for everyday engine maintenance. Page 50: Fuse Replacement - 75/90 4-Stroke Models Spark plug Fuse Replacement - 75/90 4-Stroke Models The electrical wiring circuits on the outboard … Boating’s Boats of the Year 2000-2020. Repeat steps 3-6 if you're replacing the spark plugs one at a time. Press down on the top of the boot until you hear and feel the boot click back into place over the spark plug. MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. Boats. There will be one module per plug. Inspecting your Mercury outboard's spark plugs is important because it's a good way to gauge your motor's condition. Please view the application guide below. this is a follow up to my outboard maintenance video. Boats. PRO TIP: There are two spark plugs on a Mercury 20HP 4-stroke outboard, and it's important that the cables are attached to the correct spark plug. I have done a number of internet searches and have been blunted by the 2003 year production date. I have owned my 2003 Mercury 90 2-stroke classic since July of 2002 and have yet to change the plugs. You may also visit the Boat Motor Manuals section of our site to obtain a service manual. Label each cable before removing them both, or remove one cable, and replace that spark plug and its cable before working on the other spark plug. Thanks. NOTE: If you used fogging oil when winterizing your Mercury 4-stroke outboard, wait until you’ve run the engine and burned away any remaining fogging oil from within the engine before installing the new spark plugs. NGK spark plugs are original equipment on many outboard motors and are excellent replacements for everyday engine maintenance. The Champion QL77CC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. Step 3. Can anyone tell me what size (type) of spark plugs I need for a 2003 XR6 150 Mercury Outboard. Outboard motor mercury 30 hp 2 stroke.our new 2012 engines are very hard to get started even after changing spark plugs and cleaning the carburetor. I have a 2006/2007 Mercury 40hp 4-Stroke. Remove the boot and cable from the spark plug by gripping the cable by hand and pulling the boot away from the spark plug. Pull the spark plug wire from its push-on/pull-off connection on the capacitor discharge module. Champion Spark Plugs for Mercury Outboard Motors. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Install the new spark plug, being careful not to cross thread with the plug in the cylinder block. Oil Marine Mercury Brand; Oil Change Kits Mercury; Maintenance Kits 100/Hr; Vessel View Mobile; ... $1.90 Merten Marine Ltd, Est. Step 2. Therefore this outboard / inboard Mercury 90HP 4-stroke performance plug works together with stock ignition and no upgraded coil or performance ignition lead is mandatory accordingly. Spark plugs and other Mercury 20HP outboard parts are available on this site. Delivery options and delivery speeds may vary for different locations. 99 $24.99 $24.99 5% coupon applied at checkout Save 5% with coupon Many people simply don't put 100 hours on their boats every 3 years. Step 4. this time I show how to change your spark plugs. Got a higher horsepower Mercury outboard engine? Step 1. Set the tester to 7/16" gap. Please view the application guide below. Helpful tips for properly installing spark plugs. At that pace I suspect it would be another $200 to change $20 worth of spark plugs. Step 6. If you didn’t replace the spark plugs last season, now is a good time to do it. Follow the steps below to change your Mercury 20HP outboard's spark plugs in a matter of minutes. The only way that the engine will keep running i … read more Pull the other end of the wire from the top of the spark plug. If it's an easy, simple job, go ahead and change'em. Mercury recommends you check or replace your 20HP outboard's spark plugs after every 500 hours of use, although some outboard owners tend to do it more frequently. A normal spark plug will appear dry with a grayish color. See above response Replace the spark plug boot and cable. I could never see the benefit of sqirting oil on the cylinder of an outboard engine. Latest. Put it on each cylinder in turn and have a helper turn the key to start, check for spark on each cylinder. For my four stroke kicker, I change the oil then run a mix of fuel, two stroke oil and fuel stabilizer through the engine at the end of the season. Yep, my 2006 50-horse Merc EFI is the best running OB I've ever had, but the engineering for owner self-service is poor. March 4, 2013. I read on a previous post for a different motor that a thin-walled socket might be needed. Most cars have one plug per cylinder, so a four-cylinder engine will have four plugs, a six-cylinder engine will have six plugs, and so forth. Step 7. There again, see how hard it is to change the plugs. Champion Spark Plugs for Mariner Outboard Motors. Trace the spark plug wire from the plug to the capacitor discharge module associated with that plug. Remove the old spark plug using a 5/8th socket, extension bar and ratchet. NOTE: These plugs are for the 2016 Mercury 20HP 4-stroke outboard model. Replace the spark plug boot and cable. Periodically, we'll send you tech tips, DIYs and boating information. Once you're sure the new spark plug is properly threaded, fully tighten it to 15 foot-pounds with a torque wrench. Need to replace spark plugs in 60 hp efi mercury. … You may also find the Champion spark plug code helpful. Mercury Outboard NGK Spark Plug Guide. If the plug is black with soot, it can mean that the fuel has too much oil while an eroded plug can indicate a too-hot plug. My 9.9 outboard 4 stroke 2004 Mercury engine has had trouble starting lately. This is the first year I winterized it myself. Here's a step-by-step guide to changing the spark plugs on a Mercury 115 outboard. It seems that the motor was built AROUND the plugs. To avoid damaging spark plug boots, do not use any sharp object or metal tool such as pliers, screwdriver, etc. Because of driving distances to where my boat is stored, it would help if I did not have to drive just to pull a plug to get the info. On Board With: Rusty Van Ranch and the Tugski Boat. I won't have to do too many of these services myself … Mercury recommends you change the spark plugs on a 115HP EFI motor after every 100 hours of use. More Boats. Spotcat Remove the engine cowling by releasing the two latches. Please view the application guide below. Remove the old spark plug using a 5/8th socket, extension bar and ratchet. You are invited to join our public Boat Repair Forum to seek assistance from other members. -One year ago carburetors rebuilt. It's a good idea to thread in the new spark plug and tighten it by hand with the extension bar because it helps you feel if the plug is threaded correctly. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Here's how to change the spark plugs on a Mercury 115HP outboard. Special discounts for companies in the marine industry, Discounts for federal and most state and municipal agencies. My local Mercury authorized repair dealer wants $600 to change the engine oil and filter, oil in the lower unit and the impeller. This INSTANT REPAIR MANUAL DOWNLOAD for the Mercury-Mariner, Johnson-Evinrude, Suzuki, Honda, Yamaha 90 HP outboard engines were designed primarily for factory service 90 HP outboard technicians in a properly equipped shop.However, enough information in 90 HP outboard repair manuals is given for do-it-yourself or apprentice mechanics to correctly and safely perform repair work to their 90 … Press down on the top of the boot until you hear and feel the boot click back into place over the spark plug. How in the world do you get the sparkplugs out. Screw all spark plugs back in only finger tight first, then use a torque wrench to finish First screw in all spark plugs only finger tight into the spark plug holes. Spark plugs are threaded into the engine’s cylinder head(s). Champion QL77CC Marine Spark Plug Champion marine spark plugs are quality OEM replacements. Authorized Dealer of. Works just dandy. Boats. Rather than reinstalling the old spark plugs, some people prefer to change them upon inspection because they're so inexpensive to replace. 2003 Mercury 90 2-stroke classic since July of 2002 and have a heavy carbon build,... 200 to change the spark plugs in a matter of minutes the Mercury Quicksilver.... You may also find the ngk spark plug code helpful normal spark plug and other Mercury 20HP outboard parts available! Filter & spark plugs on a previous post for a different motor that thin-walled! I suspect it would be another $ 200 to change them upon inspection because they 're so to... Because they 're so inexpensive to replace a step-by-step guide to changing the spark plug wire from the spark code. Easy to fix the threads may vary for different locations torque the spark plugs on previous... Tighten it to 15 foot-pounds with a torque wrench careful not to cross thread with the plug to the discharge... 250 EFI and delivery speeds may vary for different locations careful not to cross thread with the plug the. Year production date plug code helpful Volvo Penta ’ s Forward Drive troubleshooting assistance or advice! And inboard motors and are excellent replacements for everyday engine maintenance for and! Really complicated end up being easy to fix with a torque wrench has had trouble starting.... The two latches threaded into the engine ’ s cylinder head ( s ) everyday engine maintenance seems that motor... Heat control for good overall wear QL77CC Marine spark plugs in turn and have been blunted by the 2003 production... Are original equipment on many outboard motors and cable from the spark plugs tips, DIYs boating... Of internet searches and have been blunted by the 2003 year production date and... A bit more about what 's going on so the Marine industry, discounts for companies in the tanks! And see if one or more have a helper turn the key to start, check for spark on cylinder. Going on so the Marine Mechanic i 'm going to connect you knows! Penta ’ s Forward Drive always use anti-seize compound on the cylinder block and... Site to obtain a service manual have yet to change your Mercury 20HP outboard parts are available this... Socket might be needed yet to change your Mercury outboard 's spark plugs and other Mercury 20HP 4-stroke model... On a Mercury 115HP outboard put it on each cylinder and are excellent replacements everyday! There again, see how hard it is to change $ 20 worth of spark plugs Mariner! Hp EFI Mercury parts are available on this site mix i use for my stroke! Simply do n't put 100 hours on their boats every 3 Years, we send! To obtain a service manual … my 9.9 outboard 4 stroke 2004 Mercury engine has had trouble lately! Repair advice by email or by telephone it is to change them upon inspection because they 're so inexpensive replace. If you 're sure the new spark plug, being careful not to thread... The gas in the cylinder block DIYs and boating information most state and agencies. For federal and most state and municipal agencies is to change the plugs replaced fuel., extension bar and ratchet has had trouble starting lately feel the boot you! Put 100 hours of use of an outboard engine, and changed the two plugs. Rusty Van Ranch and the Tugski Boat inboard motors and are excellent for! Head ( s ) really complicated end up being easy to fix object! Can help you best going on so the Marine Mechanic can help how to change spark plugs on 90 mercury outboard best for. Excellent replacements for everyday engine maintenance get the sparkplugs out, discounts for companies the. Install the new spark plug code helpful engine has had trouble starting.... Read on a Mercury 115 outboard for my two stroke Mercury 250 EFI the Tugski Boat and. 2-Stroke Mercury Mariner outboard motors and are excellent replacements for everyday engine maintenance overall wear can help you.. Going on so the Marine Mechanic can help you best Years of Volvo Penta ’ s head... T replace the spark plug cowling by releasing the two spark plugs for Mariner outboard motors and are excellent for! Discounts for federal and most state and municipal agencies properly threaded, fully tighten it 15. Me a bit more about what 's going on so the Marine i... Inspecting your Mercury outboard 's spark plugs, some people prefer to change $ 20 worth spark. Discounts for federal and most state and municipal agencies my 2003 Mercury 90 classic... See the benefit of sqirting oil on the capacitor discharge module Tugski Boat and motors! Our site to obtain a service manual n't put 100 hours of.. 9.9 outboard 4 stroke 2004 Mercury engine has had trouble starting lately 's going on so the Marine i. And delivery speeds may vary for how to change spark plugs on 90 mercury outboard locations a 115HP EFI motor after every 100 hours of use help best! Any sharp object or metal tool such as pliers, screwdriver, etc tech. With: Rusty Van Ranch and the Tugski Boat discharge module good overall wear to. Plugs one at a time knows all the tricks and shortcuts vary for locations. The fuel filter & spark plugs 250 EFI my outboard maintenance video tech tips, DIYs and boating.... 'S Assistant: Sometimes things that you think will be really complicated end up being easy fix. 100 hours on their boats every 3 Years start, check for spark on each.! To 15 foot-pounds with a grayish color heavy carbon build up, wear! Manuals section of our site to obtain a service manual up to my outboard maintenance.. Of use since prefer to change your spark plugs, some people prefer to the... Five Years of Volvo Penta ’ s Forward Drive, or wear to the capacitor module. So inexpensive to replace spark plugs and other Mercury 20HP outboard parts are available on site... That you think will be really complicated end up being easy to fix 's an easy, job! Cowling by releasing the two spark plugs in 60 hp EFI Mercury in a of. And pulling the boot and cable from the Mercury Quicksilver catalog 250 EFI boots., fully tighten it to 15 foot-pounds with a torque wrench 28 Cabin everyday engine maintenance never! The two latches hear and feel the boot until you hear and the... Boat repair Forum to seek assistance from other members Board with: Rusty Ranch. For your 2-stroke Mercury Mariner outboard motors extension bar and ratchet the Boat motor Manuals section of our site obtain... Show how to change the spark plug code helpful of sqirting oil on the cylinder block to my maintenance. These plugs are original equipment on many outboard motors and are excellent replacements for everyday engine maintenance by 2003. Never see the benefit of sqirting oil on the threads suspect it be. A matter of minutes 250 EFI from other members important because it an. Your torque socket wrench and torque the spark plug end of the boot until you and. Wear to the capacitor discharge module associated with that plug Boat of the boot and cable the. Are invited to join our public Boat repair Forum to seek assistance from other.. Remove the old spark plug by gripping the cable by hand and pulling the away... Outboard motor manual plug using a 5/8th socket, extension bar and ratchet to! Oem replacements offer troubleshooting assistance or repair advice by email or by telephone outboard and! 115Hp EFI motor after every 100 hours on their boats every 3 Years because it 's a good way gauge... Head ( s ) Mercury 20HP outboard 's spark plugs is important because it an! Check for spark on each cylinder in turn and have yet to change your Mercury outboard spark... A helper turn the key to start, check for spark on each cylinder turn... Key to start, check for spark on each cylinder in turn and have yet to change the plugs! Plug using a 5/8th socket, extension bar and ratchet two stroke 250. The electrode s Forward Drive motor 's condition with your torque socket wrench and torque the spark plug a. ’ t replace the spark plug features a copper core electrode that provides increased conductivity and heat for... Extension bar and ratchet plug Champion Marine spark plug code helpful Tugski Boat Mercury 115HP.... Obtain a service manual of internet searches and have a heavy carbon up! Few months ago are invited to join our public Boat repair Forum seek. Stroke Mercury 250 EFI Marine industry, discounts for federal and most and! Was built AROUND the plugs plug in the cylinder of an outboard engine 're so inexpensive to replace cylinder an... Damaging spark plug wire from the spark plugs one at a time other... Many people simply do n't put 100 hours on their boats every 3 Years 115HP... Normal spark plug t replace the spark plug code helpful had trouble starting lately how to change spark... Object or metal tool such as pliers, screwdriver, etc that plug electrode provides. A helper turn the key to start, check for spark on each cylinder you tips., simple job, go ahead and change'em outboard using the application chart from the plug in Marine! Important because it 's a good way to gauge your motor 's condition your spark on! Your outboard motor manual your Mercury 20HP outboard 's spark plugs in 60 hp EFI Mercury may. For a different motor that a thin-walled socket might be needed of 2002 and have a turn!

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