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Engine Runs Poorly. Many engine performance problems can be linked to maintenance issues such as stale fuel, dirty air filter, fouled spark plug, deteriorated oil, and Cooling fins being debris filled. A great way to help avoid these problems would be to perform an annual tune-up using a Briggs & Stratton engine Maintenance Kit.Nov 23, 2017 Before getting too deep into troubleshooting, make sure that the throttle control at the helm advances the throttle lever on the engine from stop to stop. Wide open throttle (WOT) seems to strike fear into the heart of many boat owners.I’m missing a third of the speed. When motor is trimmed full down its extremely slow and sluggish and then I start trimming it up so it will pick up speed. I used to be able to get 33 to 35 mph out of it easy no problem. Full throttle it took off like a bat out of hell. Now it’s like an 80 year person trying to run.Adjust or check the linkage or control mechanism until the lever or shaft hits the stop and/or goes slightly into the spring override ( if the injection pump is of that style). This can all be done with the engines turned off, at the dock. Clogged filters are easy to change and if you have a vacuum gauge installed you will “see” the issue.1. Jun 18, 2019. #6. IF the engine was converted from self- oiling, and the old injection ports were not, or are not now, properly sealed to keep air out, extra air will enter, will cause the engine to run too lean, and will consequently cause it to overheat and trigger s.l.o.w.1999 200 efi mercury outboard motor starts and runs great except at full throttle it will die after couple minutes but then restart right away go to full throttle and repete. changed … Mercury Tracker 40 hp 2 stroke 4 cylinder Changed out water pump now I have no reverse or neutral and it starts up in gear.Aug 20, 2014 · Boat motor dies coming off throttle-gctid588941. 08-20-2014, 01:41 PM. As I'm bringing the throttle back pretty slowly when coming down to idle speed, the engine drops down low RPMs and dies. If I bring it back real real and I mean real slow it'll stay running. Each time it dies, it starts right back up and seems to run fine in all other aspects. 4,292. May 12, 2008. #3. Re: Boat won't go over 4,000 RPM's. Check your prop. See what the factory recommended size and pitch are and compare it to the one on your boat. Since yours is a ski/wakeboard boat, the previous owner may have increased the pitch for more holeshot, which would decrease top end speed.There are several problems that can indicate that a car’s starter should be replaced including a clicking sound when trying to start the car, a slow starter speed and a grinding noise while the engine is running.Jul 21, 2012 · Yamaha 2 stroke. I idles fine and cranks with ease. On the hose I can run it up to full RPM, but in the water (under a load) it will " bog down". For while it would bog a little and then pick up an run normal. Over time it has progressed to the point now that it will not pick up at all. I can still manually run up the RPM on the throttle in ... First time I noticed the boat was running sluggish. Engine sounded great and normal, but took me a long time to get going. I am still learning the fundaments of trimming drive and trim tabs but I now the difference between the 270s slow hull shot and being even slower than normal. Month goes buy without using the boat and sitting in water.Boat runs fine at slow speed, but wont speed up .... the motor still runs fine though ... doesnt rev, doesnt sputter, - Answered by a verified Marine Mechanic. ... HI, have a 1999 johnson 60hp motor. starts fine, runs fine full throttle until i slow down, then it won't go above 2400 rpms, tilt motor up out of water, rpms jump to 4800, tilt back down into water, ...First time I noticed the boat was running sluggish. Engine sounded great and normal, but took me a long time to get going. I am still learning the fundaments of trimming drive and trim tabs but I now the difference between the 270s slow hull shot and being even slower than normal. Month goes buy without using the boat and sitting in water.Sep 25, 2009 · Sep 2, 2009. Messages. 272. Sep 25, 2009. #2. Re: Boat runs great in Driveway, but stalls on water. The difference is in the water the engine is under load --- on the muffs it is not under any load. If you have not changed the prop ----> increased pitch etc., I would run a compression test and check the timing. Apr 6, 2016. #1. So last week, after running all day without any issues, my motor decides it will only run at full throttle. It was slow to start, but if I choked it and floored the throttle it would fire up and run just fine at higher rpm's. It may keep running at 3/4 throttle, but as soon as I back off closer to 1/2 it dies.If one runs a large computer network, a network monitoring tool is crucial as it can protect your business. A network monitoring tool monitors all of the computers on a network constantly checking for errors. It will check all of the compon...

Here’s a run-down: Make sure that the kill cord is attached. Because your Suzuki outboard won’t start in gear, ensure the engine is in neutral. Inadequate fuel supply is a common issue, either from pinched hoses or a lack of fuel in the gas tank (s). Make sure that there’s no water in the fuel lines. Perform a visual inspection in the ...Turned out, the inner lining of the gas line–Mercs best–has a separate membrane. This membrane–very thin–separated inside the line. When I would cruise at 2/3 throttle or less, no problem. Give it the full throttle and she’d bog down because it was crushing the inner membrane. New hose for $40 and problem solved!Mar 4, 2009 · Tip-An easy way to start a flooded outboard engine is to give full throttle turn the choke off and give few quick pulls. The full throttle will open the butterfly valve thus reducing the intake manifold vacuum and allow a large amount of air to circulate in the combustion area of the engine thus drying the "flooded" gas. One possible reason why boats no longer achieve appropriate speeds at full throttle is a spun prop. This occurs when the bond between the propshaft and blades are broken, which subsequently causes the rubber insert to spin independently.Check All Fuel Lines and Filters. Since a jet ski bogging down is primarily caused by too much fuel getting through the carburetor and into the engine, the best place to start is by examining every piece of machinery that is involved in the fuel relay process. That includes the fuel system in general, the fuel lines, the air filter, the fuel ...

If your boat has been sitting for a year without being run, you should rebuild the water pump. One more common occurrence worth mentioning happens when a customer runs the engine out of the water without an adequate water supply. All it takes is 45 seconds of running dry and the impellar is ruined. Make sure you have a good set of flushett ...I have a 97 mercury 115, it is slow accelerating and does not run well at full throttle. It runs its best at 3/4 to half throttle. Replaced all of the fuel lines, fuel filter, spark plugs, checked and reset pick up timing and full throttle timing, checked ignition system.· #3 · May 18, 2009 Yep. Sound like you have a spun prop. Not too costly. Depends now your prop is made. Might can just change out the inner hub. There is an inner hub made of rubber that seperates the inner spline collar from the rest of the prop. This works like a sheer pin and also helps dampen vibration comming off the prop.…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Aug 25, 2007. #1. I just bought a 1998 Mercury 40 hp outboard (ser. Possible cause: Remove, clean, and properly adjust the carb, in order to fix this probl.