Those systems have an injector + mechanical pump... check the fuel line to see if its getting a restriction . And the filters.. If not there check the float bowel located on the right side ( standing behind the boat looking forward. It's located under the air intake...if it isn't allowing enough fuel in you'll stall. Honda is a good engine but the engineers got lazy when they left half of the system efi and half mechanical.
Sounds like fuel starvation, check fuel pump either seperate or in the Carburetor.
SOURCE: 1999 Mercury Mariner 9.9hp outboard motor
should be on the side with a lever but could you give me more info please
SOURCE: 1974 johnson outboard motor 25hp stalls when hiting high end
Not familiar with that specific motor but had similar vintage smaller HP Johnsons. From my experience it sounds like it could be that the high speed carb adjustment is too lean. What I would try is running the backing off the high speed screw 1/4 turn to 3/4 turn, then test. If works better, screw back in in 1/8 turn increments until the problem recurs, then back out 1/4 turn and leave it there.
SOURCE: My honda 2hp outboard won't rev fully without half choke.
Yep, the carb (only one) needs to be cleaned. Do not dip in acid. The carb has a special coating on the outside that will be damaged if dipped. It should be cleaned in an ultra sonic cleaner. If that is not avaiable, general a non corrosive solvent sprayed through the various passages ( like brake clean) can get you going. Use compressed air when finished (a can a compressed air used to clean computers works good for little carbs)
Good luck!
SOURCE: won't run much raster than idle speed
Since there is no background to this, I assume at some point in time, the motor ran ok for you...
The first thing to do is to drain one of your carburators into a glass jar to check for water. If there is water, you will see it separate from the fuel in a couple of minutes. The water is on the bottom. If there is water, you will need to flush the motor with good fuel, one carburator at a time and probably will have to pump your tank.
If there is no water, the easiest thing to try is the following...when the motor starts to bog down, activate the choke. (If you have a side mount box that activates the choke when the fast idle lever is all the way up), you will have to have someone go back to the engine and manually pull the choke lever out. If the motor picks up, the motor is most likely in need of a carb job.
You can then do a cylinder drop test while motor is idleing, momentarily pulling the spark plug wires off of the spark plugs one at a time. If you pull one off and the engine speed does not change, listen for spark at the spark plug connector to the engine. If you hear the clicking of spark spark is probably ok. The issue with that cylinder is probably fuel related...probably a clogged carburator. If one carb is not functioning correctly, they all probably need some work. If you are not into mechanical stuff, you should have a dealer do the work. After the carbs are cleaned, they need to be adjusted for proper idle and idle/air mixture as well as vacuum balanced . If you are going to attempt it yourself be sure to by a manual either from Honda or one after market.
Before the carb job, a good dealer will always do at least a compression and spark check to be sure there is not an internal issue. The spark plugs should be checked at this time and changed out if they look questionable. Only use NGK DR7EA spark plugs not a substitute.
Also, check your oil and be sure it is clean and at the proper level.
There are several other things that it can be, but this is the most common.
SOURCE: 3.5 mercury outboard stalls when put into forward
hi take the prop off see if there is anything /string/ between the hub and the housing check oil lvel in g/box /is gear box nice and free if all is ok try it in ware with just a small amount of choke
drain /empty fuel out replace with fresh /correct oil mix
check /change fuel filter/air filter
warm engine up check idle mixture ajustment/tick over speed
increase idle speed slightly/7/800 rpm
hope this helps merlin v 12
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