Had the carb rebuilt, was told a bad coil, Its a creaftsman 20 hp rider 50 inch deck, runs really well for a short, shuts off after getting hot
Sounds like a bad coil to me ... it only makes sense that has the heat from the engine transfers into the coil the coil windings expand and causes a open resulting in ignition failure and no spark to the plugs... if you need parts try www.partstree.com
I was mowing along on my LA145, which had about 200 hours on it, and it slowed down then died. Before it died, it was acting like it was losing power. It felt like it was only firing on one cylinder. I waited about 20 minutes and it restarted after a lot of cranking. I made a couple mowing passes, and then the same thing happened.
Because I have mowed commercially for many years, I know my equipment inside and out. This mower was in top running condition and should not have been acting this way. There were no engine misses, no backfires and it was not normally hard to start. I knew the carburetor was clean, the coils were good, and the plugs were new. The fuel filter was recently changed. I got off, lifted the hood and gave a general inspection of the engine compartment. I noticed the fuel filter was nearly empty. I pulled the hose off the tank side of the filter and saw there was no flow.
The gas should gravity flow from the tank to the filter, if the tank has a good supply of fuel. Not that I recommend this practice, but I have no problem with doing it myself....I wiped the hose off and blew air back into the fuel tank. It helps to take the gas tank lid off first. After I got a good flow of air going back into the tank (it required several lungs full of air, you can hear the bubbles) the fuel began to gravity flow back through the hose at a decent clip. This fixed the problem. There is likely silt build up in the tank and it settles at the output port blocking the flow of fuel.
The problem repeated itself several times last summer. Back at the shop, I used compressed air (turned down to 30 psi) to blow the line clear. The problem has not shown up in quite some time.
My murray riding mower run for 15-20 mins then shut off, i wait 30-45 mins and it will start up run a little while and start over.
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If it starts then I highly doubt that your problem is the coil. Sounds almost like a fuel delivery problem to me. The best way to check your coil is to remove the spark plug and try to start the mower while holding the spark plug against the engine housing (with insulated pliers) and if you see a spark then your coil is fine.
The second thing to check is your fuel filter to make sure it's not plugged.
Report back and lets go from there.
I have a new fuel filter, no blocks in fuel lines, spark plug looks fine, air filter is clean. What else?
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