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yth18542. Backing out of barn, died. Just shut down. So being that time I replaced everything, coil included. Turns over like crazy. Plug looks like it was just unpackaged. No fuel or spark. Nothing but turning over. Disabled seat safety, nothing. Watching grass grow....ugh. Any help out there?1

Can you hear or feel the fuel solenoid on the carb click when the key is turned on and off. Could also try putting a small amount of gas into the intake and see if it starts and runs or starts and then dies.

Being a Briggs single OHV I am thinking you lost a piston rod, head gasket or even drop a push rod . Check for piston movement. This engines are bad about blowing the head gasket too. Either one can cause a sudden engine failure.

I for one am confused
"Replaced everything"
means exactly what ?
"Turns over like crazy "
means strong or really fast like there is no spark plug in the engine ?
"No fuel or spark "
plug is dry and does not throw a spark ?
"Died , just shut down"
Like it ran out of fuel or like you turned the engine off ?
Did the engine stop really quickly or seem to revolve for a long time with no power ?
Did you hear a bang just before it stopped ?

How was it running the last time you used it and when was that ?
From what you have written could be as simple as a dud safety switch to as complicated as a broken con rod or if you are really lucky both + some more

Replaced battery, fuel and oil, fuel lines, plug, coil.
Spins Like no plug.
Plug looks new. Not wet, doesn't look like it fired at all.Died like I shut off the key.
No noises . Was at slow idle backing out.
Was running fine. FResh oil change.
Seat switch disabled.
I also have a dyt 4000 (given to me),i use to get my disabled ass around the property, that had an 18.5hp. Got switched with what they.call a replacement 19hp b&s. Needed a head ga sket twice. Blown in same spot, directly across from plug, Made a repair. Runs beautiful.
I drained the oil looking for metal found none. Gonna pop the head, see what's up

I'd put a a half teaspoon of gas into the plug hole, put the plug back in and see if it will fire. You can also turn it over with the plug out before you do that and see if you have compression. Use a compression gauge but if you don't have one put your thumb over the plug hole - you'll feel it push your thumb off. You can also use a spark tester or timing light to see if the plug is firing - meaning you have spark. I respect what others suggest but before you take things apart you first figure what is missing of the three things needed to run

Spark
Fuel
Compression

Stick a pencil down the plug hole & turn the engine by hand
Either the flywheel is spinning freely on the crank shaft or the piston is no longer connected to the crank shaft .

Oarhead said:

Disabled seat safety, nothing.

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Why was this done?

I'm out of this one. Not going to assist an individual that tampers with safety items on something that came maim or kill someone. Good luck with it.

slomo said:

Why was this done?

I'm out of this one. Not going to assist an individual that tampers with safety items on something that came maim or kill someone. Good luck with it.

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I bypass them all of the time for testing purposes.
It gets put back functional when done repairing.

slomo said:

Why was this done?

I'm out of this one. Not going to assist an individual that tampers with safety items on something that came maim or kill someone. Good luck with it.

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Hey pal...disabled temporarily...I am disabled not stupid

Scrubcadet10 said:

I bypass them all of the time for testing purposes.
It gets put back functional when done repairing.

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Thank you!

So got the head off...perfect....kinda pissed to change it. It's that nice. Valves moved smooth, push rods straight. Piston moves freely....no noises. My greatest weakness....electrical..

Oarhead said:

Replaced battery, fuel and oil, fuel lines, plug, coil.

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Most all new parts require testing.

Oarhead said:

Spins Like no plug.

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Valve stuck open or broke rod? Lifted valve seat possible.

Oarhead said:

Plug looks new. Not wet, doesn't look like it fired at all.Died like I shut off the key.

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Lack of fuel reaching the plug. Or could be the carb solenoid if it has one.

Oarhead said:

No noises . Was at slow idle backing out.

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Not recommeded to idle down a splash lube engine. Hope yours has an oil pump.

Oarhead said:

Was running fine. FResh oil change.

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Great. Ever cleaned the block cooling fins yet? This is a yearly item in your engine manual. Remove the top metal engine cover and investigate. Some Dawn soap and scrub brushes. Compressed air works good. Clean the block like this is a new engine.

Oarhead said:

Seat switch disabled.

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We've covered this already.

Oarhead said:

I also have a dyt 4000 (given to me),i use to get my disabled ass around the property, that had an 18.5hp. Got switched with what they.call a replacement 19hp b&s. Needed a head ga sket twice. Blown in same spot, directly across from plug, Made a repair. Runs beautiful.
I drained the oil looking for metal found none. Gonna pop the head, see what's up

Click to expand...

IF the head gasket is toast, you will need to lap the head and the block area where the head sits. As in taking a sheet of plate glass and some 220-400-800 grit wet/dry paper to it. Let the paper DO ALL THE WORK. Straight edge wouldn't hurt here.

Well we tried to save you some frustration by having you do some non-invasive tests first but you went straight to tear down. So far I only seen only shatter flywheel taper but that can happen too.

Plus I have already two engines this year where the only problem was bad plugs.

sgkent said:

I'd put a a half teaspoon of gas into the plug hole, put the plug back in and see if it will fire. You can also turn it over with the plug out before you do that and see if you have compression. Use a compression gauge but if you don't have one put your thumb over the plug hole - you'll feel it push your thumb off. You can also use a spark tester or timing light to see if the plug is firing - meaning you have spark. I respect what others suggest but before you take things apart you first figure what is missing of the three things needed to run

Spark
Fuel
Compression

Click to expand...

So I got the head off. Gasket looks like new....kinda pissed at replacing it...anyway valves move as they should, push rods a5re nice, take a closer look 2moro. Piston moves as it should with no noises. Inside, where valve stems reside, pretty gunkified. Ccleaned it well. This machine was due a good tune-up...no happy if this is electrical. Not my strong suit.

Some of this amazes me....people ask for your help and then totally disregard and or do not listen..Thanks for the wealth of knowledge that all so feely give!! I have learned so much....by doing things the best practice way SAFELY! everyone be well!

Oarhead said:

yth18542. Backing out of barn, died. Just shut down. So being that time I replaced everything, coil included. Turns over like crazy. Plug looks like it was just unpackaged. No fuel or spark. Nothing but turning over. Disabled seat safety, nothing. Watching grass grow....ugh. Any help out there?1

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Sounds like a sheared flywheel keyway

Oarhead said:

yth18542. Backing out of barn, died. Just shut down. So being that time I replaced everything, coil included. Turns over like crazy. Plug looks like it was just unpackaged. No fuel or spark. Nothing but turning over. Disabled seat safety, nothing. Watching grass grow....ugh. Any help out there?1

Click to expand...

Sounds like a sheared flywheel key, pull the flywheel and inspect

bertsmobile1 said:

I for one am confused
"Replaced everything"
means exactly what ?
"Turns over like crazy "
means strong or really fast like there is no spark plug in the engine ?
"No fuel or spark "
plug is dry and does not throw a spark ?
"Died , just shut down"
Like it ran out of fuel or like you turned the engine off ?
Did the engine stop really quickly or seem to revolve for a long time with no power ?
Did you hear a bang just before it stopped ?

How was it running the last time you used it and when was that ?
From what you have written could be as simple as a dud safety switch to as complicated as a broken con rod or if you are really lucky both + some more

Click to expand...

A bit flip,bertsmobile1,but in my case:

SamB said:

A bit flip,bertsmobile1,but in my case:

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Cute!

ha!!! Now it's both tractors. One races like it's gonna blow up....new head gasket, plug, filters, oil, coil, valves adjusted. B&S 18.5 hp, 33r777.
Tractor2. Was running normally this AM...Then half hour later only runs smoothe when throttle fully engaged, (choked), on normal high, (rabbit throttle), chokes spits shuts off. I truly hate carburaters. The only plusible explanation maybe the brand new gas I put in it last nite. 5 gals of bad gas will piss me off.....

If you get me a plane ticket I would come to your house and look at it with you. Best I can offer.

Go back to the basics. Some good ol' air, fuel, spark and compression. Let us know of you have trouble with the first one.