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Mercury outboard fouling plugs?
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Mercury outboard fouling plugs?
The plug on the left is fouled with carbon. NGK BU8H Spark Plug NGK Standard Spark Plugs are proven technology that offer reliable performance. I changed out the spark plugs and nothing I'm lost for words. WalletHub reviews both companies side-by-side to show you which is better for your needs. We've researched the best spark plugs for mercury 2 stroke outboard 2023 on Amazon and make. Too much gap can result in a higher rate of misfires, loss of power, plug fouling, and poor fuel economy. " I have a '88 Mercury 90hp, 3cyl, oil injected 2 stroke motor that keeps fouling one cylinder plug. Standard spark plugs are treated with corrosion-resistant plating to ensure ease of installation and removal. The Outboard Shop: Outboards: Parts: Service: Spark Plugs for Mercury and Mariner TwoStroke Outboards. Mar 21, 2009 · Mar 21, 2009 Re: Will hotter spark plug prevent fouling? Yes, the lake is restricted to idle speeds only. 78 Merc 140 hp inline 6 keeps fouling plugs. Too much gap can result in a higher rate of misfires, loss of power, plug fouling, and poor fuel economy. 2013 Mercury Pro XS Serial #1B975402 Engine cut out on speed recently, so I pulled the plugs to check them all and found one was fouled out Just went back out on the water and engine wouldn't plane off. Top cylinder keeps fouling plug, compression is 125 or better on each cylinder. Step by step guide to replacing sparkplugs on mercury 300 V8 outboard. They are surface gap plugs I'm using the correct plugs and have had the fuel ratio set at -1 by my Mercury dealer. More serious issues are also plausible, for example, the choke or cold start enrichment circuit could be failing to. First, ensure your low speed valve on your carburetor is adjusted to the proper level. Known for their reliability and performance, these engines have become a popular choice for boating enthusiasts worldwide. The motor is 6 - Answered by a verified Marine Mechanic. Last Spring to maintain the warranty, I hooked up the 5-gallons and went to. NGK spark plugs are original equipment on many outboard motors and are excellent replacements for everyday engine maintenance. Nice square corners on the electrodes helps make a reliable. If you are in the market for a new Mercury outboard motor, finding a reliable dealer near you is crucial. deliver slow wear rate, stable spark, superior anti-fouling, improved fuel efficiency and lower emissions. Feb 25, 2009 "I have a 2001 Mercury 225 Opt. We are double oiling to break it in but I wouldn't expect them to foul that fast. Jun 25, 2014 #1 I have a 1996 mercury. Jul 23, 2022 · Symptom 1: Your Engine Sputters When Trying to Start. 97 Merc 225 EFI w/ 193 hours. It's less susceptable to fouling during extended idling. When it comes to purchasing a Mercury outboard, finding a reliable dealer near you is crucial. It smokes a lot for the first 1-2 minutes, then cleans up Make a point of always carrying 4 spare plugs for your kicker, along with a spark plug wrench and socket so that a fouled plug can be quickly changed Mercury outboard motors Nissan outboard motors Suzuki outboard motors Tohatsu outboard motors Yamaha outboard motors At this point I suggest a compression test. My 4 stroke auto engines do not run full throttle ever and the plugs last many thousands of miles. Please view the application guide below. Mercury & Mariner Outboards Thread starter Coork; Start date May 31, 2004; C Joined May 13, 2004 Messages 27 Fouled plugs EFI injectors may need a cleaning or you may get away with adding some fuel injector cleaner to the fuel. Mercury Mariner Outboard Forum. The plug on the left is fouled with carbon. 5 As valve guides fail from the repetitive motion, it can cause oil to enter the combustion chamber and foul up the spark plugs. I have a 1984 Mercury 150hp Black Max that runs good at high speed but when idleing out to the no wake zone it shakes and splutters and doesn't run smooth. Chrysler outboard manuals. On the negative side, these surface gap plugs require the extremely high voltage of an electronic ignition. The narrower the gap, the faster the plug wear. Mar 8, 2023 · Links to the best spark plugs for mercury 2 stroke outboard 2023. Get some starting fluid and spray the plugs clean with the brake clean then try it with the starting fluid. In any case, cut the core plugs, then take hold of the rope with your hand and the boot. Thread starter jorgens98; Start date Mar 28, 2005; J Joined Aug 6, 2004. It runs the standard LFR4A-11 plug but [I] may try the LFR4A-E plugs. 2-Stroke Outboard Spark Plugs. Our boat is a 1999 18 ft Triton 180 Premier. The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy and accelerated plug wear. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. Worn or damaged valve guides, worn or damaged piston rings, rich fuel mixture and a leaky head gasket can all be causes of spark plugs fouling. NGK BU8H Spark Plug NGK Standard Spark Plugs are proven technology that offer reliable performance. It's probably the floats since you said the plugs are fouling. 8M00880149949 SHOP ALL Mercury - Mercruiser. ? I am a mechanic but don't know much about 2 strokes, let alone Opti's. Thread starter Jerry Glenn; Start date Apr 1, 2012; J. Photo 2: Wet fouling. It runs the standard LFR4A-11 plug but [I] may try the LFR4A-E plugs. If you would like to check the gap, you can do so with a gap gauge Apr 2, 2013 · spark plug fouling on a 2000 50 hp mercury. My injectors have been cleaned with low hours on. engine overheats. com 184 Jones Drive Brandon, VT 05733 USA (800) 209-9624 (802) 247-4700 (802) 419-3055 Fax Plug electrodes—the ends that sit in the engine—that are worn, appear burned, or have dirty or oily deposits should be replaced with properly gapped plugs. Jun 4, 2023 · Mercury Marine has been manufacturing outboard engines for more than 75 years. Indices Commodities Currencies Stocks Bad news. The bottom plug is always wet when I take it out. Please enter a valid email address. F90TLRB Fouling Plugs 1 &2. Mercury 90 2 Stroke fouling one plug after some use, stalls when accelerating Mercury 90 2 Stroke fouling one plug after some use, stalls when accelerating.
I change the plugs twice it seem to be lacking spark. Fouling spark plugs is a common occurrence. Mercury 90 2 Stroke fouling one plug after some use, stalls when accelerating Mercury 90 2 Stroke fouling one plug after some use, stalls when accelerating. Changed the plugs and it then ran great for about two hours and then did the same thing. A Singaporean court ruled on Monday that a 31-year-old American engineer who was found dead at his home in the city last year committed suicide, with no foul play involved despite. Jul 5, 2024 · These Mercury 90 ELPTO 3-cylinder performance spark plugs are designed to help you Bolster Power Output, torque, kick-out time and acceleration to further Bump Up fuel economy. THE VERDICT Nationwide is better than Mercury overall, per. May 13, 2005 Re: What spark plugs for a 50hp Mercury? If it's an 8,it will be a Brownband or even a red stripe mid 80's Aussie motor. The Outboard Shop: Outboards: Parts: Service: Spark Plugs for Mercury and Mariner TwoStroke Outboards. Pure Watercraft hopes that its elec. Finally, a loss of power could be a result of bad spark plugs. In fact, this breed of spark plug brags twice the carbon-fighting ability of its everyday cousins. A plug is fouled in a cold running cylinder !----Reed valves are internal and on a reed block around the crankshaft. "I have a 2001 Mercury 225 Opti. Engine was running rough so I put new plugs in it. Instead of just doing their job of controlling the intake and exhaust airflow, valve guides might start to act like an oil pump, sending it spewing onto the spark plugs My 2003 Mercury 250 EFI uses Champion QL77CC, gapped at 90 mm. 1) If your plugs are a tan (paper bag brown) color, they are not burning "lean". Enter your email address to be notified when this item is back in stock. Country: Serial # Range: Standard Spark Plug Mercury Part Number: Standard Spark Plug Manufacturer's No. craigs list kcmo it seems like this happen more when the motor has warmed up, here are things I have checked already, compression is good, fuel and oil pumps have been rebuilt, all new hoses, recirculate valves on those cylinders are good, coils are good, replaced plugs. Im guessing oil dripped into one cylinder and fouled th eplug. In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in. You're probably hitting the choke when trying to start the engine or the floats are too high. By clicking "TRY IT", I agree to receive newsletters and promotions from Money and its partners Many people are upset about the mercury content in compact fluorescent bulbs (CFLs), but there’s a much greater amount found in fluorescent tubes. In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in. Our Force Outboard Spark Plugs are at the lowest prices and same day shipping! Mercury-Mercruiser 35-877761K01 Fourstroke Outboard Oil Filter90$17 35-877761K01 Oil Filter FourStroke Outboard This is a genuine Mercury Marine factory OEM part, not aftermarket Please check our current stock level and order below or use the Contact Us form at the bottom of the page for any questions. So many people buy the cheapest oil thinking they're saving money Cheap oil doesn't protect the engine as well, the engine doesn't perform as well so they use more fuel. any suggestions?" Sep 19, 2007 I have a 1984 Mercury 150hp Bl. After a long storage, both motors were fouling plugs. I recently purchased a 97" pontoon with a Force 120 outboard. My colleagues Carl Lambor. The flywheel on an outboard will need to be removed when repairs are needed such as the motor not starting properly. The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy and accelerated plug wear. Dual Mercury Master Technician - for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC. sonic exe ios download You may also find the Champion spark plug code helpful. Particularly users have stated that they encountered situations where the engine starts frequently stalling. This product comes in a pack of one. A spark plug's reach is defined as the length of the threads. 16 #5. We are double oiling to break it in but I wouldn't expect them to foul that fast. Our Bike Mercury 90 ELPTO 3-cylinder high-performance sparkplugs' design ensures optimum mix ignition in the cylinders and warrants additional Horsepower Potential. 2. My 8hp mercury outboard 1997 2 cyle 2 stroke, Keep fouling the top spark plug out,then it wount start until i replace the plug with a new one. four stroke engine and the starboard engine cylds 1,3,5. I have a Mercury 70hp motor that continualy fouls number one plug (dry not wet) resulting in loss of power. The rest look perfect Mercury & Mariner Outboards. The 90 HP 4-stroke Mercury engine is one of the popular choices among boaters looking for an efficient, reliable, and powerful engine for their vessel. Please enter a valid email address. Find out 3 things that can foul a spar. A Singaporean court ruled on Monday that a 31-year-old American engineer who was found dead at his home in the city last year committed suicide, with no foul play involved despite. If the plugs are fouled they wouldn't start on either of those. It is a high quality plug that offers good performance and long life. 1996 Mercury 200hp fouling spark plugs then won't start after idling for a short period of time. You didn't say what yeat the engine is, but surface gap plugs are not new and you're stuck with them. We have tried everything from cleaning injectors, decarb, compression and leakdown, MAP sensors, temp sensors, coils, plug wires etc. I was told to put NGK Iridium plugs in it, and a. Lead fouling generally shows up as yellowish brown deposits on the spark plug’s insulator nose. Next, check the spark plugs for signs of fouling. With the Faria gauge, My idle temps were barely enough to get the gauge off the 100 degree mark. In the past week it has fouled the plugs twice. dmv ca comgov They are quite expensive, compared to the standard Champion L-76V, Autolite 2852, AC V40FFM, NGK BUHW, etc. racerone. Start the engine and let it warm up before moving the boat. Setting the gap for your particular engine is vital as insufficient spark plug gap can cause pre-ignition, detonation, and even engine damage. 4 Cold Fouling - Dry, black deposits indicate rich fuel mixture or weak ignition. A voltage regulator maintains a constant voltage level and is frequen. This overheating also makes the electrode of the spark plug wear out and foul out faster. Checked the new plugs and they were fouled. Take a look under the hood of 1940s classic Mercury cars.
2) If you are checking plugs after running no wake speed for 3 minutes, all you are reading is the idle speed condition of the plugs. Mercury Outboard Spark Plug (MOP) — This is a OEM replacement plug that is designed specifically for use in Mercury outboards. deliver slow wear rate, stable spark, superior anti-fouling, improved fuel efficiency and lower emissions. This motor isn't a heavily used motor, used maybe 2-3 days in the summer season and recently it had been sitting around for a few years without use, it is. NGK BU8H Spark Plug4999. Joined Aug 6, 2004 Messages 15. 813 #6. We are double oiling to break it in but I wouldn't expect them to foul that fast. My colleagues Carl Lambor. I have elusively used the NGK surface gap plugs in every outboard I have ever run. Joined Jun 25, 2003 Messages 5. Kick it over 11,000 times (with the plug out, to clear the oil, fuel etc) Clean the plug start kicking again. NGK SPARK PLUGS. Im guessing oil dripped into one cylinder and fouled th eplug. Champion spark plugs are original equipment on many outboard and inboard motors and are excellent replacements for everyday engine maintenance.
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NGK spark plugs are original equipment on many outboard motors and are excellent replacements for everyday engine maintenance. 9 outboard on my Carib dinghy. I put in new plugs, started the motor but fouled them in a day. Champion Spark Plugs for Mercury Outboard Motors. They are surface gap plugs I'm using the correct plugs and have had the fuel ratio set at -1 by my Mercury dealer. NGK OEM Spark Plug Kit for V8 4. For the boots, I used an accel solid core non-suppressive wire kit from advance auto. The most common cause of this issue can be attributed to incorrect spark plugs, so be sure to check that the right spark plugs are being used first. Kurtkenway New member Pull one spark plug wire, stick a spare plug in the boot and ground the spark plug against the metal frame or block. Leading in the automotive industry, NGK spark plugs are available for virtually every type of engine - cars, motorcycles, marine applications, small engines and power tools. Start by installing the correct spark plugs and make sure your fuel/oil ratio is correct. Dec 20, 2012 · Lead Fouling. In fact, this breed of spark plug brags twice the carbon-fighting ability of its everyday cousins. NOTE:There's one latch at the front and one at the back of the engine cowl Remove the latch mechanism from the rear of the engine cover to get full access to the spark plugs. magic seed osrs Mercury Outboard Spark Plug (MOP) — This is a OEM replacement plug that is designed specifically for use in Mercury outboards. Find out 3 things that can foul a spar. And luckily, this blog will share a descriptive chart of Mercury 2 and 4-stroke spark plugs. Lead fouling generally shows up as yellowish brown deposits on the spark plug's insulator nose. Please remember this is not a sponsored video Step 1. The second dealer removes the plugs and sprays fogging oil into the cylinders. Add to CartAdd to Cart Learn More. When the thermostat goes out, your engine temperature w. I have a 09 Merc 50 2 stroke. The 1950s Classic Mercury Cars Channel covers popular antique Mercurys from the decade. Make sure your weekend pastime doesn't wreak havoc on your budget—or your marriage. Re: 225 EFI fouls spark plugs. What causes it and solutions is taught in this guide. You're probably hitting the choke when trying to start the engine or the floats are too high. Our motor fowls the plugs and then it's of course hard to start and does not run really well for quite a long time of full throttle. -----Plugs foul for a reason, some are ---weak spark----poor compression ---too much fuel---no thermostats Spark plugs with a hotter heat range will burn off carbon deposits more easily than a colder plug. So, what are some of the common causes of flooded boat motors? Choke. Spark Plugs for MERCURY Outboard | Niterra Part Finder. NGK BU8H Spark Plug NGK Standard Spark Plugs are proven technology that offer reliable performance. My stepson has a 1985 Merc 90HP that we got running this weekend after a 2 year downtime. However, it could be a sign of a larger mechanical failure, something the right Jaltest diagnostic tool will be able to pick up on Loss of engine power. Increasing the throttle would cause the engine to die. Most common causes of wet spark plug. skydiving accident survivor Fouling spark plugs is a common occurrence. They can answer questions for any Yamaha outboard model. Engine May Stalls, Loss Power Or Make Excessive Vibration: Another commonly mentioned problem with mercury 4 stroke outboard or boat engines is frequent stalling, sudden loss of power, and excessive noises. Mercury outboard engines have long been recognized as one of the leading brands in the marine industry. Oct 11, 2021 · I run some full throttle most trips but fully expected a set of plugs to last longer5 litre 2 strokes would run several years without fouling plugs. I have checked everything. I put in new plugs, started the motor but fouled them in a day i have a 2000 mercury 4 stroke outboard with big foot. I have checked everything. The fuel pumps on most 2 cycle OBs use crankcase pulses to pump fuel to the carbs. Spark now at plug #3 ad no spark on # 1 cylinder plug now. If you would like to check the gap, you can do so with a gap gauge Fouled spark plugs: Inspect spark plugs for fouling, wear, or damage; Replace spark plugs as needed; Check and adjust spark plug gaps if necessary;. It's a fairly new engine and it's Other symptoms that may point to a weak spark plug include: rough idle poor acceleration However, these symptoms are not necessarily caused by a weak spark plug; you may be dealing instead with a fuel system issue or poor compression in one or more cylinders. The legendary Queen frontman was once a British Airways baggage handler. However, like any mechanical device, it is not immune to issues. subway open near me right now -----Test and see if spark. Engine then ran great for a about 20 minutes, then shut down to about 1/2 throttle and ran rough. The motor will not stay running at idle but if i give more gas it runs. NGK ILFR6G031 BEL 33-8M0006614 Find spark plugs for your 4-stroke Mercury Mariner outboard using the application chart from the Mercury Quicksilver catalog. 9 to troll at 800-1100 rpm for 2-3 hours. Advertisement The 1964-1965 Mercu. Compare to other cards and apply online in seconds Info about Mercury Credit Card has been collected by. Cranked it again; it started up fine but cut out when I throttled. I also have a 1988 25 HP Merc. Whether you’re cruising along the coastline or fishing in a serene lake, having a reliable and effic. Set spark plug gap on new, replacement spark plugs. Get your Mercury outboard spark plugs here: http://bit. My injectors have been cleaned with low hours on. engine overheats. Advertisement The 1940s Classic Me. Apr 9, 2009 · The most common cause of this issue can be attributed to incorrect spark plugs, so be sure to check that the right spark plugs are being used first. Indices Commodities Currencies Stocks Bad news.
Just changed: Remote tank, Fuel hose, Fuel filter assembly, and new correct plugs. " I have a '88 Mercury 90hp, 3cyl, oil injected 2 stroke motor that keeps fouling one cylinder plug. four stroke engine and the starboard engine cylds 1,3,5. One of the most common causes of flooded outboard motors is improper use of choke. Updated: March 28, 2016. As the engine is cooling, open the hood. The motor does clean the plugs or heat up enough to run well. After running several hours and then stopping the plugs will be extremely oil fouled, and the engine won't crank. nexus mod manager Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. Aug 4, 2009 · My 1995 Mercury 3 cylinder 2 stroke 60 HP is fouling plugs regularly. The same mechanic rebuilt. Spark plugs can foul up with oil and carbon on two stroke engines resulting in poor spark I have a 2002 Mercury 60 HP 2 Stroke engine that starts fine idles fine runs great up to a certain RPM and then starts to sputter and won't go any faster, top speed on my boat is 26 MPH and will only go 12 MPH and the starts to sputter The Mercury Optimax 115 is a popular outboard motor that is known for its reliability, fuel efficiency, and outstanding performance. Mercury outboard motors have long been recognized as a leader in the marine industry, providing boaters with reliable and powerful engines for their watercraft. One of the most sig. Pulled the cover and stupid me left 2 of the plug wires off. i have to change plugs about every 3 tank Reply racerone Gold Medal Contributor. kate and sam clothing cracker barrel The most common cause of this issue can be attributed to incorrect spark plugs, so be sure to check that the right spark plugs are being used first. In this instance, a case of hard starting was the result of carbon buildup on the plugs. Jul 5, 2021 · Quick video showing how to change the spark plug in a 4 stroke Mercury/Tohatsu 4HP/5HP/6HP Always refer to your own owner’s and service manual! Here is the v. A spark plug's reach is defined as the length of the threads. 16 #5. The 1950s Classic Mercury Cars Channel covers popular antique Mercurys from the decade. Pure Watercraft hopes that its elec. Chrysler outboard manuals. Champion spark plugs are original equipment on many outboard and inboard motors and are excellent replacements for everyday engine maintenance. most durable hiking shoes This article aims to offer an in-depth look into the most common problems you might encounter with your Mercury 40 HP 4-Stroke engine. Mar 13, 2023 · Replacing spark plugs in your Mercury outboard boat motor is really quite easy. My manual lists a 200/225/250 horsepower, all the same plugs. After running several hours and then stopping the plugs will be extremely oil fouled, and the engine won't crank. 9 to troll at 800-1100 rpm for 2-3 hours. Stop the motor again and recheck the color of these plugs. Our motor fowls the plugs and then it's of course hard to start and does not run really well for quite a long time of full throttle.
Mar 14, 2018 · Is it the oil? The gas? or the coolant? Spark plugs can be the “canary in the coal mine” for underlying engine issues. Misfire during highway driving and going up a hill. Mercury Outboard NGK Spark Plug Guide. Spent the last month waiting fora new set of plug wires for my motor. If wondering, Force 120 plugs will be wet oil foul if using lower engine RPMs too long. And they do winterize a lot of four strokes. Using a new set of plugs cures the problem instantly. To correct this, empty the fuel tank of all oil. If wondering, Force 120 plugs will be wet oil foul if using lower engine RPMs too long. Joined Sep 8, 2009 Messages 82. In case this happens, there will be a constant fluctuation in the fuel supply pumped into your boat's carburetors. This is one of the most obvious signs of a spark plug issue. I was using West Marine oil and I know that … Some common maintenance parts in your Mercury ignition system are spark plugs, spark plug wires, and tune up kits to keep your Mercury outboard engine running smooth. Photo 2: Wet fouling. I … To know for sure if a fouled or damaged spark plug is the cause of your boat’s engine issues, you’ll need to examine the spark plugs. Mercury 150 fouling plugs and bad enricher valve. Premium NGK spark plugs are known for their reliable performance and superior anti-fouling. nursing educator jobs near me Solution: Inspect the spark plugs for wear, damage, or fouling, and replace as needed Engine Runs But Won't Shift If your Mercury outboard is cranking but not starting, the issue could be with the ignition system, lack of fuel, or poor compression. It has a rebuilt powerhead, but I am having problems with the motor fouling plugs out. Appearance & Symptoms: Lead fouling can only occur in applications that use leaded gasoline, such as racing engines. My manual states that using the incorrect spark plug may cause engine. My injectors have been cleaned with low hours on. engine overheats. Faulty Impeller Malfunctioning Fuel Pump Tangled Propeller. Most will not fire at low speeds with a magneto ignition or a regular points and battery ignition. Thanks to the longer nose, and the inherently longer fouling path, it takes longer to carbon foul a still cold engine. This is a simple tutorial on doing one of the most basic procedures on your Mercury Verado. spark plug fouling on a 2000 50 hp mercury. Best oil for the Merc/Mariners is their own Quicksilver brand Aug 10, 2005 · Re: 90 horse merc 2 stroke spark plugs. Please be sure to include your engine serial number!. Chrysler Marine inboard parts. Mar 8, 2023 · Links to the best spark plugs for mercury 2 stroke outboard 2023. Advertisement With all t. At one time I received new 140 hp promo outboards each year, each year they fouled the plugs every 30 hours, almost exactly. Both times it was just one plug out of three. 00 Canadian, of course you'd still have to buy the ends and boots seperately. So many people buy the cheapest oil thinking they're saving money Cheap oil doesn't protect the engine as well, the engine doesn't perform as well so they use more fuel. I use Mercury Quicksilver oil mixed at the correct Ratio. It lets a user control the venting of the propeller blades to optimize the acceleration for quick planing. www.patreon.com Feb 27, 2024 · Often a faulty CDI unit will see intermittent or no spark on cylinders and may only breakdown when your engine warms up Ignition Coil. Lead fouling generally shows up as yellowish brown deposits on the spark plug's insulator nose. Mercury says they recommend a Champion plug, but that was what I removed and they always foul up quickly. In this section, we will discuss fuel system problems, spark plug troubleshooting, propeller issues, and engine power and acceleration problems. Fix it with the correct plug. Particularly users have stated that they encountered situations where the engine starts frequently stalling. So many people buy the cheapest oil thinking they're saving money Cheap oil doesn't protect the engine as well, the engine doesn't perform as well so they use more fuel. Our Bike Mercury 90 ELPTO 3-cylinder high-performance sparkplugs' design ensures optimum mix ignition in the cylinders and warrants additional Horsepower Potential. 2. Went to pick them up to find the kit only included one length of plug wire, long enough to make 1 wire, at a cost of $40. Mercury outboard motor vibrations make boating experience unpleasant. Stop the motor again and recheck the color of these plugs. Changed the plugs and it then ran great for about two hours and then did the same thing. spark plug fouling on a 2000 50 hp mercury. Jun 10, 2002 · RE: 2001 Mercury 75 Hp 2-Stroke Fouling Plugs An easy check would be to make sure that you have the right plugs first.