got a 4hp 2003 merc 2 stroke. was stalling out and not restarting after running more than 5 minutes WOT. installed new carb, plugs, new fuel tank. ran it for about 45 minutes and not a problem. now (1 month later) it stalls out after 15 minutes and wont restart for 30 minutes, then it will only rev in neutral, then kill once in gear.
any ideas? i am stumped and tired from paddling back to the ramp.
sounds to me like poor compression. - worn cylinder walls & rings. or possibly a bad fuel pump/ filter. If you have compression , spark , and good fuel/air mix it should run! I had an engine once - Cummins 6cy in an 80’s GM car - I could drive 20 miles and it would slow down and die. Turned out to be a fuel filter. When running strong it was sucking trash (metal flakes) into the fuel filter material, and the engine would die , I could wait 10 minutes and I could drive another 20 miles after the trash would fall off the filter.