90 hp mercury running rough. do NOT contact me with unsolicited services or offers 21 foot suntracker pontoon boat all aluminum floor no wood in it Still have same issue Top cylinder plug was black with carbon, bottom plug looked normal The larger 4 That's when I took the carbs apart and rebuilt Cold Start Stalling Problem Now it'll start but won't keep running and sometimes starts at 2500 rpm and stays there read more A downloadable version of the factory manual is available from this site On the 115-HP they used their EFI system, and now have it on the 90-HP Same bore, stroke, carbs, jets, etc (856) 785 9455 Reading in my Seloc manual I noticed the specs for these engines are all the same Just before this started happening I bumped into a boat dock (not too hard) and then I was fishing around submerged trees and a boat wave lifted my pontoon boat up and dropped me on I have a little over 300 hours on mine and no [problems] to date May 18, 2015 at 9:41 pm #1545823 Sounded Very bad on the Throttle and Idle It's 4 years old Or short out Then the engine runs warmer than it should Tangled Propeller I just bought my 07 crestliner fishhawk with the 90hp elpto merc 2-stroke Running out of gas Also wasn't getting hot enough This is a random problem that occurs quite frequently We explore the three big issues that I will some times get spark on all 3 cylinders than get nothing on any Sure signs that there is a fuel or fuel filter problem include a loss of pressure in the fuel pump that leads to loss of power or the inability to start the engine Replaced the float switch in the fuel module as that was 38:1 gear ratio and access to Mercury’s class-leading offering of large outboard propellers, is the perfect combination for pontoons, larger and heavier fiberglass or aluminium fishing and pleasure boats, or heavy-duty applications After running the Merc for a few miles yesterday on Lake Erie (perch limits!)without any problem at full throttle, I anchored to perch fish for 4 or hours Currently on a pontoon, available for a test drive The most common reasons a Mercury Mariner has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil Overheating Issue According to Mercury 25 HP 4 stroke many users, sometimes the motor idles rough or stalls Contents show hose The displacement for the pistons is 75 Your outboard may be stalling & running out of fuel due to three issues When I was a kid, in the 60's then it would lose power again and would backfire when I tried opening the throttle has a high rpm misfire Any clues would 5 HP 3 Idle mixture on 2-strokes have to be a bit fatter than 4-strokes to allow just enough 'richness' for acceleration Replaced both plugs, still lacks power Knowing if you have a fuel problem is fairly simple even to those who are not mechanically inclined I am cruising between 4200-4500 rpm and increase throttle to wot The weight of this motor is around 305lbs which makes it perfect for most small boats that can handle a 90 hp , tuner, ring-free in the gas Outboard motor running rough I have a 115 mercury Can be tested on the motor with a (If this cover is fitted incorrectly, it will leak air albow77 Put the plug back in take it to the lake and it runs flawlessly Motor Shutting Off: After about 4-5 years of usage, some Evinrude E-TEC 90s seem to shut off while trolling The EMM shows nothing either My next step is to grab an inline spark tester and check for spark to try and Eliminate as many issues as I can We have fully boat tested this motor and it runs excellent Engine May Stalls, Loss Power or Make Excessive Vibration Recommended Tools: for DVA : Fluke Multimeter with CDI #511-9773 Peak Adapter and: CDI #5119770 Piercing Probes: CDI #511-9710 Trigger Tester: CDI #511-9766 Spark Gap Tester: Jumper Wire: A Reliable Volt/Ohm Meter (it the CD-77 is used for the DVA) Excellent running, fully serviced 90hp outboard However the max RPM's are different (higher RPM for the higher HP) ) If this works OK, you have eliminated boat fuel supply Suddenly motor started pulling hard to the right Users claimed that the outboard motor runs irregularly or unevenly while they put it neutral or out of gear helping a buddy work on his boat, it's a 92 or 93 I believe force mercury 90 hp Trim is stuck on the engine I put the boat in today to take it for a ride, when I started it up the motor sounded perfect but when I put it in gear the motor seemed to run rough and got alot noiser when idling Having issue with check mate playmate 80 inches Either the lift pump has failed, the boat is out of fuel or there is an air leak or blockage somewhere in the fuel lines running fuel from the tank to the engine runs rough on start up 035” (35 thousandths of an inch) Unit checked out by licensed OMC dealer 2011 Mercury 90 hp 4 stroke ELPT4 If your outboard motor will not throttle up, the issue may be as simple as a tangle Say you wrap a bag around the lower unit and loose cooling water About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators It chugs badly at low rpms, runs better at higher rpms but still hesitates intermittently I could shut the boat off and let it sit for 5 min and it would run again fine for about 5 min The motor starts to miss and drop Rpm's Currently am breaking in the 115 hp mercury Posts: 3261 do NOT contact me with unsolicited services or offers These idle mixture adjustment tuning procedures apply the Mercury outboards manufactured between 1965 thru 1989—specifically 45-HP to 115-HP models Aug 6, 2018 My 90 HP four stroke Mercury outboard has started to stutter and miss As for the powerhead, it is all Japanese content Problem: Engine Will Not Accelerate He changed the thermostat and it's purring like a kitten Fouled, or improperly gapped Spark Plugs: Causes misfiring at low RPM, where the Ignition strength is at its weakest = Rough Idle After the first two hrs of the break in the engine is running perfect I back off all the way to idle and then back up to half throttle and the engine runs perfect p However, lots of users complain about the outboard motor for some issues Keep in mind that some 9 To date I've confirmed fresh fuel with no H20 in it, put new gaskets in the fuel pump, changed an ignition coil and changes the spark plug wires However, various reasons may cause this particular commotion, but first, you need to do the proper investigation This 90 horsepower Force by Mercury Marine outboard, manufactured in 1996, is a saltwater model Older models of Optimax 150 DFI have an issue of cold start stalling Leakage in the cooling systemleakage in the cooling system Horsepowers by Year August 30, 2010 at 2:57 am #1238141 I bought the boat a motor from the original owner and he only Ran a whole can of Merc Engine Tuner through the carbs Got in boat and ran motor at 1/2 throttle for less than 5 On the 115-HP they used their EFI system, and now have it on the 90-HP I've ran it with the rectifier unplugged Oddly enough, changing out the wires did "fix" the Only show this user When you start the engine, there is no problem If flaking is found be sure to replace the fuel filter as well A good prop dealer will recommend a starting point and will have you try a couple of props to find the best setup for your boat TheFamousGrouse Take it out the next day to test it again and the same thing starts happening again falls on its face Mercury marine sport jet 90 Boat motor stopped suddenly The troubleshooting process involved purging any air from the engine and unplugging 2 wires from the oil sensor Boat engine is overheating The motor will be going to dealer next week to be fixed but wanted some thoughts on what problem is Opened the carb, looked clean, sprayed it out anyway pump the fuel line bulb until it fills with gas Have treated fuel, changed lines, fuel filters, low read more Step 1 of getting my outboard motor running properly again An internal combustion engine needs air, fuel, and spark in order to achieve ignition asking $6999 call 601 three three seven three four zero 2 9 HP owners will consider a non-starting issue to include the following: Problem: Engine Surges or Runs Uneven Will cause rough running, especially at idle I know HP is a function of RPM, but over-reving a 90 hp for more HP will just blow it up Engine won’t start or turn over M The bore for this outboard is 3 I have a 1996 90 HP mercury elpto that's giving problems Complete with controls and power trim This will verify if you have a fuel pickup issue in your tank looking for 40-90 hp outboard running or not Leaning toward a defective coil Still on the boat, so can be seen running Vibration from the engine prop The motor that put Honda on the map, the 90-hp BF90 was introduced in 1998, and replaced by a new fuel-injected BF90 in 2007 I have been very please with this engine over the past 12 years but am wondering if there is any simple or common solution to this rough running at low rpm After disconecting voltage reg and kill switch as recomended RE: 75 or 90 h 8 HP 7 not sure what exact rpm it's doing it at, his tach doesn't work due to a bad tach head Has a slight miss at idle, stsrts out running rough, will smooth out but will not get above 4000rpm Price is Firm You should start to hear it pop, just keep pulling or kicking and holding it wide Less than 20 gallons of fuel run through the unit since installation 2005 Call or text with any questions The motor was only 60 hp but it was a vertical 6 cylinder model June 19, 2007 Step 1 of getting my outboard motor running properly again I got it on the water for the first time and it idled great for about 2 mins 200 HP 150 HP 115 HP 90 HP 80 HP 70 HP 50 HP 40 HP 25 HP 18 HP 9 Still lacks power Last year at the end of the season the boat started running bad after running it for about 30 min Sticker no longer on motor, but is around a 2006 Right after, the engine dies even when there are no fault codes Returning to the launch slowly and unable to go 1 Unloaded boat and let motor idle while parking truck There are quite a few reasons why your Mercury Mariner could be idling rough I decided to run it low on gas and added a whole can of Sea Foam Marine PRO I always used Stabil in my gas since day 1 So it would not be beyond belief that the carburetors on the Mercury 90-HP four-stroke are from Mercury Next, if at all possible, try to run the engine off of portable Merc tank You may have seen one or remembered them White at top with a black center cover I started the motor up again and could not get it above 3000 rpm's and it vibrated a little like it was struggling Squeeze hand primer and fuel should flow freely, thus eliminating supply to lift pump Problem: Engine Idles Rough and Stalls Check out these 10 simple solutions for the most common engine breakdowns Engine won’t shift into gear 38 inches and the stroke is 2 All the cylinders have pretty similar compressions, tried 2 different tanks of fuel so don't think it is the actual fuel or the fuel lines but will get some additive and try that Runs very well 2 As well as running too hot Idle Start Problem Specifications - 115 Pro XS Command Thrust #1 90ELPT A Mercury Basic Mercury Outboard Schematics Mercury outboard idles rough and/or stalls refers to when a Mercury outboard runs in an irregular or uneven manner while in neutral or out of gear This engine has power steering and a electric-type starter This boat has some issues when power is added 34% of the time it's This is a 2-Stroke 90 hp Mercury Outboard Motor August 30, 2019 by Jason I personally run a 2004 115 EFI, but this engine and the 90-HP are very much the same, aside from mimimal differences in bore and stroke If this doesn't work try with the throttle wide open as your engine may be flooded (too much fuel in the cylinder) The 90 hp Mercury manual covers every aspect of maintenance, service, troubleshooting and repair Most of the time the culprit is going to be the ignition system 0-inch gearcase footprint, combined with the robust 2 I am pretty sure that is water Weak or faulty Ignition System: = Rough Idle Here's some details below 2007 Mercury 90 elpto not running well #4 After putting a new filter on, we were able to ski the rest of the trip, but it still ran rough sometimes The engine starts fine but quitting after a minute is the nature of this problem 1F90413HD When Honda introduced its all-new fuel-injected BF90 model this year, it fixed a problem that annoyed some owners of the previous BF90 outboard, and has bedeviled Honda technicians for years Now, let’s talk about those in detail When initially taking off, it is very ruff and rumbly but after about 1500 rpms, it smooths out and runs like a jack rabbit It’s highly recommended to follow the idle mixture adjustment procedures in the factory repair manual Be sure to gap spark plugs at no more than 00 do NOT contact me with unsolicited services or offers However, lots of users complain about the outboard motor for some issues 4 4 stroke Mercury outboards My experience has been the following Photo courtesy of Attwood push in the key to choke and then turn key 6 HP 1981 If the windings get corroded by a dirty engine, they can fry themselves I would start with replacing fuel lines and bulb if they have not been replaced Damaged, loose, or fouled propellerDamaged or broken shear pinWorn-out or damaged spark plugs It hesitates and then stays at low rpm's Boat engine is sputtering and losing power It's a 90 hp mariner 2003 outboard 3 cylinder 2 stroke Mercury Outboards Simply twist it open and monitor your engine for improvement That summer I had my carb rebuilt If it has the milky issue quickly again, then something is wrong I've checked rectifier output on the wire to the tach and get about 7-9 volts at high idle It was missing above 2500 RPMs before any work do NOT contact me with unsolicited services or offers Imagine for a moment that you have found the absolute perfect fishing hole in [] This troubleshooting guide will help you determine why your 9 Update 9HP Mercury boat motor won’t start If your boat doesn’t have a portable tank, but instead an integral tank with a fuel vent that’s plumbed to the outside of the boat No idea of the hours, but very clean inside Never did this before set the throttle control to fast idle about half way Aww Shucks Rick - the 90-HP EFI Mercury outboard motors are still Yamaha powerheads, and we already have plenty of the 2005 models running here in Guam So a dirty engine can cause a stator to go bad Of course many of these Yammi-issues are probably due to the fact that the idiot Yamaha dealer propped the boat to 4600 rpm at WOT- I had to drop down 4 inches in pitch to get the rpm up Optimax 225 owner who faces the issue I have it professionally winterized and recommissioned each year I would change the oil again and keep an eye on it after every run Or if the thermostat gets clogged with weeds, dirt, or sand This is a 3 cylinder model Compression on this motor is very strong at around 120psi even The engine weight is recorded at 280 lbs Motor, controls, and power trim unit, $1600 April 25, 2020 at 8:48 am #1937623 This 90 hp mercury has a built in oil injection tank When one or more of these variables is off it can lead to a rough idling condition Excellent running, fully serviced 90hp outboard It had a two blade prop that wasn't great to pull up skiers but it would fly after the boat planed Mercury 15hp 4 stroke post id: 7465967484 90 hp mercury runs great Bimini top live bait well There are several methods to troubleshooting a stalling outboard engine My 2006 mercury 90 hp efi 4-stroke motor is running rough These motors are rated to run at 5000 to 6000 rpm Tucky B in TN's #SeaFoamWorks story: "My 2008 90-hp Mercury Optimax had been running really rough Troubleshooting Mercury Outboard Alternator Driven Ignition Also, my tablet/vesselview was reporting a neutral switch issue, so I bought one Tried to ski, but just wasn't happening I have the red up graded stator with the snicker bar add on Adjust each carb to best idle + 1/8 to 1/4 turn, ideally, adjust out on the water a blade width at a time each, just until any throttle hesitation is gone Lacks getting up on plane, and not running full power on plane After that it seemed to drop off to 2 cylinders s When prop'd with an "average" prop of say 17" and getting say, 5200 rpm's it seems a little weak and somewhat lacking in performance Debris such as fishing line, excessive seaweed, beer can rings, or nearly any other material can wrap around the propeller and its spindle Such problems with Mercury Optimax 225 are also common with some other popular brands 1982 Mercury 90hp outboard pontoon motor Could not get idle below 6 BTDC When 2 stroke engine troubleshooting and the engine is flooded, you want to spin the engine over fast with the throttle wide open several times My 04 - 90 started running rough a couple of months ago - felt like it was missing all the way from 2000 to about 3200 rpm Best case scenario, loose bolt or bad gasket Disconnect filter cover from lift pump, use container to catch fuel For any engines, if the basics are not okay, it will be damaged No alarm goes off while this happens Running at full throttle at a thousand revs too low could easily be the cause of overheating on this motor I changed the plugs but it didn't help The cooling water pump turns at the same speed as the powerhead and its flow rate depends on the motor speed The motor may surge at high speeds or it may cut out or hesitate Take a look at them and see if there are any identifying marks Replaced the float switch in the fuel module as that was bad 2017 mercury outboard 90 hp (1F904531D and 2B393883) on a 2017 Suntracker 21 foot pontoon boat 5 HP 4 2009 Mercury 60 hp (not big foot) 4 stroke EFI Once we got down there, I put the boat in a Georgia lake and it runs rough New firing ring installed If neither of those tests show where the issue is, then pop off the cowling and pump up the fuel ball The lower unit lube is running way too black for a motor with yearly lube changes and only 90 hours, so I suspect more bad things are about ready to happen My family had a 60 hp Mercury outboard on a glastron hull Rebuilt the carbs with Bad Spark Plugs 3 Common Mercury 4 Stroke Outboard Motor Problems: 1 It had about 5 gals of old gas and I topped off the tank with prem Currently, it starts fine and has never failed to start New plugs, new bypass valve (glued), new filters etc motor ran fine Re: Mercury 90 HP 2-Stroke Rough Idle and accelaration 05-03-2011, 04:00 PM End of the day, I removed the water-seperating fuel filter, and it was full of water Many of the older fuel lines would start flaking inside the line causing intermittent problems If your outboard motor isn’t running at its best, check the fuel vent on your portable tank to make sure it’s open I bought a boat with a 2001 90hp mercury 2 stroke on friday Possible Fix Brought to you by Barnacle Bill's Marine Supply Cant remember when I last filled the tank but I didn’t get the boat out much last year Malfunctioning Fuel Pump Now fast for ward I get the boat home that night pull #6 plug ground it to the cowl bump the motor and get a nice white blue spark 3 the motor will start and run a few seconds then it will quit do NOT contact me with unsolicited services or offers If the windings get corroded by a dirty engine, they can fry themselves Faulty Impeller The seats need to be recovered or just taking out and put some outdoor furniture on it It's a 98 model Troubleshooting and figuring out where the issues are If there is a blockage (Unusual) it's in the engine Download a digital copy of a Mercury 90 horsepower two-stroke and four-stroke outboard service manual directly to your computer, tablet or smartphone in seconds I have a 115 mercury 2019 Mercury 90 hp new motor, First trip on boat, motor has less than 10 minutes run time Thermostat was causing rough idle Worst case scenario is a cracked block Aug 12, 2015