Re: 2002 Evinrude 250 stalls at low RPMs
Having retired in 1991, I'm not familiar with the "Ficht" engine, however the entry by "OMC_10" indicates it is a carbureted engine. I would suggest........
Remove all spark plugs and check the compression. What are the readings?
NOTE.... if the starter bendix gear has a endency to kick out frequently when checking compression, finger tighten all of the spark plugs except the cylinder you're checking.
Check the spark.... Remove all spark plugs, and rig a spark tester whereas you can set a 7/16" gap. The 7/16" gap is important. Do not attempt to use the spark plugs or the inline light testers as both would be a total waste of time. No tester? Build this one.
(Spark Tester - Home Made)
(J. Reeves)
A spark tester can be made with a piece of 1x4 or 1x6, drive a few finishing nails through it, then bend the pointed ends at a right angle. You can then adjust the gap by simply twisting the nail(s). Solder a spark plug wire to one which you can connect to the spark plug boots, and a ground wire of some kind to the other to connect to the powerhead somewhere. Use small alligator clips on the other end of the wires to connect to ground and to the spark plug connector that exists inside of the rubber plug boot.
Using the above, one could easily build a spark tester whereas they could connect 2, 4, 6, or 8 cylinders all at one time. The ground nail being straight up, the others being bent, aimed at the ground nail. A typical 4 cylinder tester follows:
..........X1..........X2
.................X..(grd)
..........X3..........X4
The engine must crank over at least 300 rpms in order for the stator to energize the powerpack, hence removing the spark plugs to obtain the highest cranking rpm possible.
The spark should jump that 7/16" gap with a strong blue lightning like flame on all cylinders..... a real SNAP! What were your results?
If the compression and spark are as they should be, suspect fouled carburetors, in which case, remove, clean, and rebuild them.
Let us know what you find.