I have a 2005 Tohatsu 4hp 4-stroke outboard. I have recently had idle issues in that the warm engine idle speed drops very low at idle, the engine chugs a bit and back-coughs and stalls. New plug installed, new clean fuel in exterior tank, and it still happens. I have adjusted the idle speed screw, but that either puts it at a too high an idle speed or I get the same same problem if I try to then reduce the idle screw down to an acceptable rpm, as after 15 seconds or so at idle (warm/hot engine), it will start to slow, chug, back-cough through flame arrestor and stall. Engine has been flawless until recently.
I am a do it yourselfer, I assume I need to adjust the fuel-air mixture in the carburator. Can someone tell me how I can 1) find the needle valve on the carb to do this; 2) how best to adjust it? I assume that the adjustment should be done on a warm/hot engine while at idle. Somebody must have a quick thought as to what they would do.
Any thoughts or direction will be greatly appreciated.
Louiis
I am a do it yourselfer, I assume I need to adjust the fuel-air mixture in the carburator. Can someone tell me how I can 1) find the needle valve on the carb to do this; 2) how best to adjust it? I assume that the adjustment should be done on a warm/hot engine while at idle. Somebody must have a quick thought as to what they would do.
Any thoughts or direction will be greatly appreciated.
Louiis