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Hi ya quick update on this tiller ISEKI AC 40 very hard to start & when it does runs for about 10 sec's then stops re-try to start again very hard runs for about 10 sec's again same over & over. Checked & double checked carb Mikuni, cleaned with cleaner & blow line float seams ok jets cleaned fuel shuts off when gently closing float screw1-1/2 out, fuel system all cleaned all filters etc no air leaks inlet/exh/cyl head etc, good blue sparks however s.plug still appears a bit wet when removed after trying to start so could this be the coil breaking down under load, thanks very much for your time taking getting a bit lost now any idea's

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Posted on Jan 02, 2017

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SOURCE: Hi ya got a old ish tiller in for repair, it is a

From your description we will assume it is flooding. If you suspect float problem, check float level, holding the carb upside down the float should be parallel to carb body when needle seat is closed. On metal floats this is accomplished by bending the tab that rides on the needle, units with plastic floats you may have to replace it. Also remove float and shake it, should not be any gas in the float, this will make it flood. Also set carb adjustment screw at 1.5 turns out, may need a little tweek from there.

Posted on Oct 05, 2010

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This happens frequently after a tiller, mower, snowblower, etc. sits for a season. Your tiller is probably flooded due to a stuck carb float. You can try a quick fix by tapping gently a few times on the float bowl, then pulling the spark plug and cleaning it with a wire brush, and then wiping it dry with a cloth. If you have a new spare plug to install, that is even better.
Try to start your tiller again, and if the same thing happens, your float is still stuck and you may need to have your carb serviced.
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Clean, install, and connect your spark plug (again, a new plug is even better). Give the bowl a few taps for luck, and try and start your tiller again. If the procedure worked, your tiller may run rough for 10 or 15 seconds (maybe even up to a minute or so... let it take its course!), but then smooth out.... if it stalls, don't worry.... Start it back up.
This will often work for tillers, snowblowers, mowers, generators.... pretty much any 4 stroke "lawnmower engine". It all depends on how badly the float is stuck after the engine sits.
You can minimize having this problem in the future (it may still happen, but less often and less severe) by adding a good fuel stabilizer (such as the brand name STA-BIL) to your gas and running for 10 minutes or so before you store your "lawnmower engine" for the season.
If you still have problems, the likely cause is a stuck carb float and the carb will need to be serviced.... but hopes are high that my solution helps!
Good Luck, and Thank You for using FixYa!

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2 Answers

Hi ya got a old ish tiller in for repair, it is a ISEKI AC40 problem is hard to start & when it starts it will only run for about 10 seconds, so far checked plug which has a good spark, compression ok,...


From your description we will assume it is flooding. If you suspect float problem, check float level, holding the carb upside down the float should be parallel to carb body when needle seat is closed. On metal floats this is accomplished by bending the tab that rides on the needle, units with plastic floats you may have to replace it. Also remove float and shake it, should not be any gas in the float, this will make it flood. Also set carb adjustment screw at 1.5 turns out, may need a little tweek from there.

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