does it only happen when the engine is hot then...next time whip out the sparkplug and check if it's sparking, If not it may be a coil going open circuit under high temperature, it will be easy to check with a multimeter
I thought this might come up, dont take any chances. long rubber gloves and a face mask are an absolute necessity...and a great deal of care and keeping kids animals away etc etc if you opt for this method
Ahh I have another idea and a simple one to try. It sounds like water in the float bowl...typical power one minute and struggling the next!
Undo the float bowl drain screw and drain some off, if theres water there it will soon be fixed
Ben
choke ON is whichever way lifts the plunger at the other end of the pivot
I wouldnt rush into that carb clean before trying a few adjusments, you have the idle adjuster screw ( the big one with the spring on it) and also the air mixture screw.
seems to me that its running out of fuel so try turning the air mixture screw clockwise 1/2 turn and then re-setting the idle using the idle adjust...aka throttle stop...aka tickover screw