Tom:
The only thing I haven稚 tried until reading your suggestions & questions is running with the new fuel cap loose, replacing the fuel pump, & checking the breather hose. With new fuel hoses from tank to pump to carb, I also blew air through the fuel tank quil tube & no dirt entered tank. No black smoke has appeared & engine has actually only quit once; all other incidents have been slowdown to stall speed for about 5-10 sec. & then return to full throttle speed. I experienced no hard starting problems. Spark plugs are dark gray (if I recall; checked them 3 weeks ago); no soot deposits & dry. I do need to use the choke trick during the stall speed mode (also suggested by JD serv. mgr). I will check the engine mount bolts & your comments regarding cleaning out the chaff certainly bear action; at 624 hrs., this has never been done! I am using fuel recently drawn from local station along with StatTron enzyme fuel treatment (1 oz to 3 gal) to counter Ethanol problems. The PowerFlow has been used since the 335 was new. Also, I have had the engine slow down to stall speed (but not quit) with mower, with mower & PowerFlow, & even several times with no load.
Meanwhile, my thanks to others who have made suggestions, some of which I致e already tried. We will keep at this until we solve it. The help of all is much appreciated. ~Dick
The only thing I haven稚 tried until reading your suggestions & questions is running with the new fuel cap loose, replacing the fuel pump, & checking the breather hose. With new fuel hoses from tank to pump to carb, I also blew air through the fuel tank quil tube & no dirt entered tank. No black smoke has appeared & engine has actually only quit once; all other incidents have been slowdown to stall speed for about 5-10 sec. & then return to full throttle speed. I experienced no hard starting problems. Spark plugs are dark gray (if I recall; checked them 3 weeks ago); no soot deposits & dry. I do need to use the choke trick during the stall speed mode (also suggested by JD serv. mgr). I will check the engine mount bolts & your comments regarding cleaning out the chaff certainly bear action; at 624 hrs., this has never been done! I am using fuel recently drawn from local station along with StatTron enzyme fuel treatment (1 oz to 3 gal) to counter Ethanol problems. The PowerFlow has been used since the 335 was new. Also, I have had the engine slow down to stall speed (but not quit) with mower, with mower & PowerFlow, & even several times with no load.
Meanwhile, my thanks to others who have made suggestions, some of which I致e already tried. We will keep at this until we solve it. The help of all is much appreciated. ~Dick