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6,511. Jul 1, 2009. #5. Re: Engine runs great in neutral, bogs down in gear under load. The MFS25A has 3 carbs. They all need to be in good shape. First, I would confirm the crankcase oil level is not even a hair high, then re-check and clean all 3 carbs, and finally do a compression test. These motors do not blow head gaskets very often.Damage to a propeller is typically identified as the most common cause of outboard engine vibration. A prop that is bent, broken, worn out or misaligned can create heavy shaking. So can obstructions to the prop like tangled seaweed and fishing line. One way to tell if the propeller is to blame is intense vibrations while running at higher RPMs.At idle and anything under about 3200-3400 RPM it runs flawless. Starts right up on electric start, fires right up with half a pull of the manual pull start, runs smooth (for an old 2 cylinder 2 stroke), and will accelerate perfectly to about 3200 RPM or so. But it doesn't want to get over that. It feels as if it's sputtering or shaking and ...Sep 3, 2015 · Main issue: Stumbles/hesitates severely under load, especially with high throttle, below about 2-3k rpm (sorry no tach) Surges around 2-3k rpm; Normal power above 2-3k rpm; Car was left sitting for 6 months between problem starting and me getting it; Engine codes (KOEO 111 - normal, KOER 412 & 413 - idle low & idle high)Jul 2, 2016. #1. My 1999 Mercury 200 Blue water EFI tilt and trim will not trim out when under a load. It seems to work fine as long as the motor is in neutral or not running at all. It do not make any unusual noises and go up and down very smooth. I did check the fluid level and the relief screw and it all looked fine. Any ideas would be great!!!Apr 18, 2020 · F70 Inconsistent Running Issues. 04-18-2020, 12:24 PM. I have a 2012 F70 4 Stroke. Sat for a few months without use. When getting out finally it would idle fine and at slow speed but not throttle up. Took it to the shop and they got into the fuel system, supposedly the VST etc. Ran great for a few trips then suddenly acted up after stopping …Joined. Apr 15, 2005. Messages. 5. May 12, 2005. #4. Re: Mercury 25 No power under load. Thanks for the advice guys, I took the front of the carb off and primed the fuel, I could see it seeping out of the bottom of the needle, I also took off each HT lead and the engine made no real change in pitch and kept running on both accounts. B.Damage to a propeller is typically identified as the most common cause of outboard engine vibration. A prop that is bent, broken, worn out or misaligned can create heavy shaking. So can obstructions to the prop like tangled seaweed and fishing line. One way to tell if the propeller is to blame is intense vibrations while running at higher RPMs.Jul 19, 2003 · 4. Jul 19, 2003. #1. I have a 1997 Mercury 90 HP Force. <br />Motor will trim up fine at idle, very slow speed, or when motor is turned off. However, as soon as I give it some throtle, the motor will drop back down into the water if she is already trimmed up or, if not trimmed, only rises about 25% an acts as if it hit an obstruction and won't ...May 7, 2015 · LDMERC New Member. I have a 2005 9.9 pro kicker...I have the strangest problem. Motor starts fine, idles fine powers up fine like 5500 RPM while on muffs even in forward gear..again on muffs. Will Ideal forever and fun forever even at high RPMS on muffs...took it to the lake and started fine..idled fine...put at full throttle won't go over 1600 ...Corrosion. Water exposure to outboard motors over time may result in corrosion. Check the gasoline tank for damage or leaks as the problem may be a corroded or worn-out fuel tank. Examine the cabling, connectors, and battery terminals for any signs of rust or damage because corrosion can potentially impact the electrical system of the motor.Aug 12, 2002. Messages. 6. Aug 13, 2002. #1. I've got a 1988 90hp Johnson that won't accelerate under a load. I can start it and rev the engine fine in neutral but when I try to go anywhere, the engine maxes out at about 2000 rpm. I've replaced the plug wires and plugs and verified that gas is getting to all four carbs.Joined. Apr 15, 2005. Messages. 5. May 12, 2005. #4. Re: Mercury 25 No power under load. Thanks for the advice guys, I took the front of the carb off and primed the fuel, I could see it seeping out of the bottom of the needle, I also took off each HT lead and the engine made no real change in pitch and kept running on both accounts. B.Lucid Motors is loading up its first electric vehicle with hardware — dozens of sensors, a driver monitoring system and an Ethernet-based architecture — for an advanced driver assi...4. Mar 21, 2011. #1. I have a 1978 Mercury 500 50 hp thunderbolt. The motor will start up and idle fine. With ears hooked to the motor using the fast idle or by puting it in gear, it will rev up just fine. With the boat in the water i can put the motor in drive and it will run at idle speeds but as soon as I try to throttle up, the motor will ...That would cut down on the air flow. Check the linkage foe throttle plates opening all the way at full throttle. You can do this with engine off advance the throttle to wide open throttle make sure the throttle [plates are full open and that the timing is advancing also. It is definingly running different.Tweet. #1. F90TLR 4 Stroke idles fine but won't get up to speed. 06-15-2013, 02:50 PM. This is a 2005 F90TLR that is idling fine, will run at low speeds (8 to 10 mph), but will not go any faster with the throttle wide open. I have emptied and rinsed the gas tank with fresh fuel, put all new fuel in, replaced the large (oil filter sized) in-line ...May 12, 2014 · Outboard Motors Forum. Mercury Mariner Outboard Forum . 1994 Mercury Black Max EFI 200HP No power under load ... 1994 Mercury Black Max EFI 200HP No power under load. Thread starter Lifwghts; Start date May 12, 2014; L. Lifwghts New member. May 12, 2014 #1 ... when I put it in neutral full idle was strong and no issues …An Outboard Motor smokes because it is burning oil. Two-Stroke Engines burn oil all of the time. Four Stroke Engines burn oil at startup mainly because of oil left in the cylinders or all the time with an oil leak. There are a couple of tricks that can be done to reduce the amount of smoke that an engine burns and here are your best options!The above tool requires the following data for calculation: Motor-rated power in HP or kW. (Mandatory) Rated speed of the motor. (Mandatory) The rated power and rated speed of the motor can be found on the nameplate of the motor. After entering the required data, click on the "Calculate" button to find out the full load torque of the motor.Solution 1: Check and clean the spark plugs. Locate and remove the spark plugs from your Force outboard motor. Check for any visible signs of wear, damage, or carbon buildup on the plugs. Use a wire brush to clean the plugs, and then use a spark plug gap tool to ensure the gap between the electrodes is within the manufacturer's specifications.Karcher power washers are known for their efficiency and reliability. However, like any other mechanical device, they can experience problems from time to time. One of the most com...Five Common Signs Of A Bad Impeller In Outboard Engines. 1. The Boat's Motor Easily Overheats. The first sign of a faulty impeller is when your boat overheats even in short periods of use. Every engine needs a cooling system that guards it against overheating.

Now all of a sudden it won't stay running for me. It starts fine, but sounds like it's either choking out or being deprived of fuel after running for just 15 to 30 seconds. Then it won't start at all for about 10 minutes. After 10 minutes, it starts fine, but dies again. I was successful keeping it running to get me back to the marina last week ...In the water, exhaust back pressure is encountered due to the fact that the exhaust housing (housing between the powerhead and the lower unit) is filled with water. This would drag down the needed rpms, affecting ignition. Normally the clue to this type problem is that the engine starts fine on a flushette (hose), but is very difficult to start ...Feb 12, 2024 · It may be possible to use a Volt Meter and your motor to Load Test your entire power supply; on the water, use the VOM to probe the power supply as close to the motor as you can, read the voltage when the motor is not running and when the motor is running on high. The difference between the resting voltage and the voltage when the …Feb 24, 2013. #1. 90 hp mercury. Bought my boat last summer ran great, put sta-bil in the gas for the first time. After running the engine for about an hour, it begain to bog. We managed to idled back to the ramp and took it home. Replaced gas in hopes it would run ok, but again the same problem. In the driveway with the muffs, runs fine, rev's ...Outboard Motors Forum. Mercury Mariner Outboard Forum ... . Help! Low power under load? Thread starter 94MercMariner200; Start date Oct 4 , 2013; 9. 94MercMariner200 New member. Oct 4, 2013 ... .-----Look at it closely and see how it is hooked up.----Then pinch the discharge hose and see what happens while the motor is running. Last edited: Oct ...

Outboard motors not running at full power under load is common when the fuel pump is bad. Fuel pumps are great components in an outboard motor. They help deliver fuel from the fuel tank for use in the outboard motor. But for them to work very well, they have to be able to deliver fuel at an optimum pressure.Hi Joe, Don't want to hack your thread but I'm going through the same issue with a 1990 90hp. 2000rpm max under load, rough but won't stall, starts and idles fine. Been to a couple mechanics but no luck. Short story is that the obvious fuel, carbs, compression and ignition have checked out according to the mechanics.…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Check if the fuel line running to the outboard. Possible cause: First things first: Troubleshoot. Pull the spark plugs & examine. Test the compres.