I HAVE A 2009 FRONT TILLER 500 SERIES. RAN FINE LAST YEAR. THIS YEAR STARTS AND STALLS. NEW PLUG, OIL IS OK.AIR FILTER IS CLEAN. IT HAS A FUEL PROBLEM. I CAN GET IT TO STAY RUNNING WITH THE PRIMER.DOES IT GET ITS FUEL FROM THE PRIMER AFTER IT HAS STARTED?

HOW OLD IS FUEL FILTER?

Rob; 95% sure it is a carburetor issue, dirt clogging a port or jet,float sticking. I will post a few sights below to show how to clean carb.

How to Fix Snow Blower Carburetor

HOW TO Clean Rebuild Tecumseh Snowblower Carburetor PART 2 OF 4

how to rebuild snowblower carburetor

Even though you drained the fuel it sounds like the carb needs to be cleaned or else the diaphragm in the carb may have a hole in it. Can you pour fuel in the carb and have it run so it is the carb. Hope this helps. In addition, did you gap the new plug sometimes they get closed up in shipping.

Replace fuel filter after cleaning tank thouroughly, to clean tank remove fuel line at carb. Drain all fuel then leave line loose until you flush tank with carb. Cleaner then blow out tank with compressed air. Now install new fuel filter and check your fuel can for trash and water better yet just add fresh fuel.

Check for a plugged fuel filter and defective fuel lines. Make sure the carburetor fasteners are tight. Check for spark at the plug--it should be blue and snappy with a new plug. If ok, squirt in some fuel mix in the plug hole, replace the plug, and see if it will pop a couple of times. If ok, make sure the primer bulb draws fuel into it after several pumps. If still won't run, remove the lower chamber of the carburetor and check the diaphragm for flexibility and no holes. Hope this helps!

Clutch or transmission, a common problem with FG 100 series Honda.

Ok I have r Royobi Tiller (30CC Gas) And last year it ran fine after rebuilding the Carb. This year it was "hard starts" Idles fine, (Tiny whisps of blue smoke in exhaust with correct ratio) Even seems to run better with the choke "on" but still...at idle only. as soon as I touch the throttle...its bogs down in tune with how much gas I give it. Little throttle? Little bog down, Little more throttle? Almost stalls, a normal throttle rev? it stalls dead! Then starts right back up again in 1 pull and idles fine again!? WTF? So after cleaning a clean carb again, (twice) and seeing no change I thought I'd go look at the original diaphragm and compare it with the rebuild kit diaphragm (which is the one in the carb.) And guess what? The replacement has a larger rivet by a factor of "2". So basically it was flooding the carb, I bent the needle tang down, better but no cigar. But I could rev it half way now. A second disassemble to bend it yet a bit further and Vrooom vroom vrooom ****! So check your needle valve even though you think its 100%. (Especially if you rebuilt the carb with a kit!)

Clean the air filter and also clean the air nipple/nozel. That should make O2 sensor not giving the same massage again.........sodeep

The air filter should be replaced. Also remove the old gas and put in new from the gas station. Finally, if you didn't change the spark plug from last seaon, do so as it is a small amount of cash for a lot of easy starts.

There is a small diaphram on the side of the carb that simply wears out. It's rubber coated mesh and the rubber coating breaks down and it stops pumping fuel into the carb. Sometimes you can run with the choke on partially, but it will burn 10 times the amount of fuel and cause more damage to the engine itself. I think it's about a $10.00 part.