Engine bogs at full throttle - Aprilia Motorcycles

Evinrude 50 HP Bogs at WOT - MarineEngine

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Aug 6, 2002 - 17 posts - ‎3 authors
83 50 HP Evinrude - sat out in weather for 4 yrs. Been cleaning ... At WOT, she bogsdown. Up to. ... Yes, this boat/motor is new to me. Actually ... Mercury 50 1987 bogs down when full @ full throttle
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motor bogs down at full throttle Page: 1 - iboats Boating Forums ..

fuel mixing issue. A good tune up is recommended. Focus on the carburetor.

the carb is not getting enough fuel to supply the motor so when u give it full throttle it will start to shut down, then when u let off it a little bit it will rev up like it sounds good ?

that usually happens when it is out of tune or the pulse hole under the drain nut gets clogged.

hope this helps

is there a rattle under the car like the cat converter is bad when was the fuel filter last replaced

Sounds like the fuel filter is getting clogged. It will flow enough fuel for normal driving, but can't supply fuel for full throttle acceleration, causing the engine to bog down. Replacing the fuel filter with a new one should fix the problem.

Set the lowend & highend needles to about 1 3/4 to 2 turns each. Choke the carb or prime it, until the carb is wet. Fire up the engine and let it warm up. Let's set the topend first since it's the easier of the two. Go to full throttle. Adjust the topend needle for peak RPM. Leave it wide open for about a minute to see if it changes any. Should the engine go lean, open the lowend needle slightly, if this dosen't work... you will have to adjust the needle valve inside the carb.( I will explain this later) If the topend runs OK, then slowly pull the throttle down until the engine begins to "four cycle" hold the throttle there. Adjust the lowend needle until the "four cycling" barely stops. Now lower the throttle more until it "four cycles" again, and adjust the lowend again. Keep doing this until you reach full idle. Now, from full idle begin to throttle up until the engine starts to bog or hesitate. Open up the lowend needle just enough to eliminate the bog or hesitation.

http://tech.flygsw.org/walbro_tuneup.htm

hope this helps :)
if it does please vote

Sounds like one of the intermittant jets is clogged. Need to clean the carbs.

Its the Fuel Filter...mine did the same thing :)

Hi,
Have you had the Catalytic converter checked? it could be due for replacement as they break down and cause tremendous back pressure.
Hope this Fixya's problem!
Paul 'W'
Onyer~EDson(:0) {#><U.K.

next time it happens try spraying water in mist form around the throttle body if it bogs, replace the throttle body gasket. if it doesn't bog you may have a bad wire wait until dark start the vehicle have someone feed the fuel very slowly and watch for arching from a wire it will be easy to see when it is dark, replace that wire.