Runs 10 sec, then dies. Will not start again unless allowed to sit 10 min.
Good compression & spark after stalling.
Gas (fresh) flows freely to carb bowl, I've cleaned entire passage between bowl & throat...no obstructions.
Had the same problem with my Honda engined mower. you can't see it easily, but there is a very fine screen in the outlet of the fuel tank that gets blocked and fuel will not pass thru it fast enough to refill carb. remove tank and pour fuel in another container . Use a flexible plastic tube in the outlet or make a small wire hook to penetrate the screen,or preferably, remove it. confirm that fuel flows freely thru it, remove any debris, and reassemble. Change spark plug, add fresh fuel,and test. best of luck!!!! Ray
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ITs hard to diagnose these things over the internet, it could be so many things. Is this a gradual loss of power? If so; Im sorry to say; that it sounds like its losing compression as it warms up. It is not cost effective to repair the unit.
If the loss of power is more sudden it could be a failing ignition module. Ive even seen spark plugs that quit working when they get hot.
To test this you will need a proper spark tester, laying the spark plug against the head will not provide an accurate assesment, and a can of carb cleaner. Run the unit with the air box cover and filter removed till it fails and immediately give a shot of carb cleaner in the carb and restart. If it starts right up it could be fuel related. IF it doesnt start right up then quickly test for spark. If no spark then its likely the ignition module. If it wont run on the extra fuel and it has spark then it has probably lost compression.
If the air filter is clean, then you have either no spark or no gas.
Gummed up carberators are well familiar with the leaf blowers. Once a year or every other year you should clean up your carb. During the winter season when your not using the blower, it is a good idea to put a 1/2 bottle of Stabil in the gas tank which will prevent carb gum-up while being stored.
You can remove the spark plug, put it back on the wire, lay the bottom of the plug next to a metal surface. Then pull the motor over while you observe for a good strong spark. If you have a good strong spark, then the problem is with the fuel.
If you have no spark, weak spark, or intermittent spark, then either the coil could be bad, plug could be bad, or you may even have a shorted kill switch.
Either no gas or no spark is your problem. Spark is easiest to check. If spark is good, remove and clean your carberator out thuroughly
I don;t know what engine is on your mower but if it has the self contained electronic ignition coil I have seen happen on several engines. It would run good for several min. then the spark just stops . And it will not spark again until it sets and cools . Just make sure it is the ignition that is not working.
Was gasoline left in the tank during off season? Sometimes gas will break down and clog the jets in the carb. The priming bypasses the carb so when you put fuel in by pumping the bulb it runs, but dies becasue no additional fuel is coming through the carb after the primed fuel is burned off. Sounds like you need to clean the jets in the carb and in the future, use Stabil in gasoline to keep it from breaking down.