The problem is that the fuel cap does not allow enough air to get into the fuel tank as the fuel is used. A vacuum is created and it stalls the engine. If you look at the cap from the inside you will see two small slots on each side of the black center piece. I took this apart and opened up those slots a little bit with a hack saw blade. This allows enough air to get into the tank to prevent a vacuum and the resulting engine stall.
I have had my FG 100 Honda tiller for close to 2 years. After one year I started experiencing the stall issue like many others. I read many posts at many sites, all trying to work on solving this issue. I followed all the suggestions will no success (carb cleaning, new plug, etc)
Then, I thought this issue through. It appeared to me that the tiller was being starved for fuel.
I fished the fuel filter out of the tank and removed the filter. I reinstalled the fuel intake line in the tank (less filter) I restarted the tiller and the stall issue disappeared. I then reinstalled the filter to the intake line and it stalled immediately. I cleaned both the large cotton filter and the tiny filter. I used carb cleaner.
Hope this helps someone?
Helped me. I had the same issue, same solution, about 9 years later...
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I have had the same problem.
The first time the solution was to replace the rubber membrane
underneath the primer bulb. Take off the bulb, then remove the plastic
part underneath the bulb. There is a rubber membrane underneath that.
The ethanol in the gasoline tends to deteriorate the membrane. The
honda dealers sell them for about 14 dollars.
The second time the problem was caused by the gas cap, not properly
venting. In this case the engine would start and run, but when I gave
it full throttle, it would quit.
It got so bad that it wouldn't even run. I noticed when I loosened the gas cap it ran great.
So I took off the cap, removed the inner parts, and got a diaper in
and pushed it though the holes in the plastic part underneath the cap,
and through the rubber plug in the center. I did this a few times and
check with my mouth to see if I could pull some air through the cap.
When it breathed satisfactorily, I put the cap back on the gas tank and
it ran great. Now it runs better than new.
After reading about possible fixes for this condition, I tried a procedure mentioned on another forum: I mixed 2 oz of Sea Foam in a gallon of high octane gas (93) and ran that through the tiller. It cleared the condition and the tiller seems to work great now......
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Wow.. I have this same problem and no one can fix.. I sure hope this solves it..
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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same problem, Honda blames me for it, they have had it in the shop for two weeks now, still can't figure out what's wrong with it, despite the obvious fact that it happens to everybody
I have this same problem and wanted to thank cjsteve47 for his fix. It works great! An easy way to test if the cap breather mechanism is faulty is simply to loosen the cap. If that solves the problem, then the cap isn't breathing when tightened, thus causing the vacuum problem, preventing gas from flowing out of the gas tank.
I have the fg100 and the cap setup is a bit different, though just as dysfunctional. The breather slots in the underside of the white insert aren't open to the atmosphere because the black rubber gasket that sits on top is too big and completely seals the breather slots from the atmosphere when the gas cap is tightened.
The strange thing for me is that sometimes I had the problem and sometimes I didn't. Turns out the problem was related to how hard I tightened the gas cap!
At any rate, I fixed the problem by using a pair of scissors to cut off the edge of the gasket at two places, preventing a complete seal. Of course, this will cause gas to leak when the tiller is laid on its side. But now at least the damn thing will work!
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