Spark plug gets gas fouled every cold start

Auto Doc's said:
Need a better picture of the head.

You can carefully get the left-over material off the head with a razor blade.

After that you need to resurface the gasket face of the head using a true flat surface like a tempered glass table and 400 grit wet/dry sandpaper. Scrub the head gently across the sandpaper and you might be surprised how much sanding will be needed to re-true the gasket surface.

Sand until the entire gasket surface is clean aluminum.

The block surface will also need some light cleaning.
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I'll take a good image of head. it felt smooth around the carbon stain. I don't have a tempered glass table. I do have a piece of plexie glass about 1/8" thick x 2'. what do you think about the amazon gasket?
 
The Brain said:
not sure about the fuel pump, don't even know where it's located. when I turned the ign. key the fuel shoot up over ten feet.then when dissassembling the head seamed like the whole cylinder was filled w/ fuel.
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It certainly sounds like you have an electric fuel pump mounted on your engine. A standard pulse fuel pump will not pump fuel unless the engine is turning over. Follow your fuel line from the carburetor. A pulse fuel pump will look like this. 👇

Amazon.com: Briggs and Stratton Genuine 808656 Mechanical Fuel Pump by Briggs & Stratton : Automotive

Amazon.com: Briggs and Stratton Genuine 808656 Mechanical Fuel Pump by Briggs & Stratton : Automotive
www.amazon.com
 
MParr said:
It certainly sounds like you have an electric fuel pump mounted on your engine. A standard pulse fuel pump will not pump fuel unless the engine is turning over. Follow your fuel line from the carburetor. A pulse fuel pump will look like this. 👇

Amazon.com: Briggs and Stratton Genuine 808656 Mechanical Fuel Pump by Briggs & Stratton : Automotive

Amazon.com: Briggs and Stratton Genuine 808656 Mechanical Fuel Pump by Briggs & Stratton : Automotive
www.amazon.com
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It is a Nikki carburetor from the looks of pictures. If you can’t tell a pulse fuel pump from an electronic fuel pump, I would suggest going to a shop for help. Why would an electronic fuel pump be on a carbureted engine?!
 
Tiger Small Engine said:
It is a Nikki carburetor from the looks of pictures. If you can’t tell a pulse fuel pump from an electronic fuel pump, I would suggest going to a shop for help. Why would an electronic fuel pump be on a carbureted engine?!
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We aren't getting all of the details.
Fuel delivery and fuel metering seems to be the main problems. An electric fuel pump will definitely flood out the engine and carburetor. Fuel is bypassing the needle and seat. There could be a problem with the float too.
Looking at the overall setup of the Rear Engine Snapper, the fuel tank height is above the carburetor height. If that is how it actually setup, there is no need for a fuel pump. Gravity feed is all that's needed. That takes us back to the carburetor.
 
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MParr said:
Looking at the overall setup of the Rear Engine Snapper, the fuel tank height is above the carburetor height. If that is how it actually setup, there is no need for a fuel pump. Gravity feed is all that's needed. That takes us back to the carburetor.
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Here’s the cylinder head after blown head gasket. not seeing metal damage image

cylinder head after blow head gasket.jpg
cylinder head after blow head gasket2.jpg

I had to use the parts engine head from orginal head.

Replacement engines head damaged under rocker arm mount. I assume it’s trashed image

orginal head damaged under rocker arm mount.jpg

Aditionaly I do smell a bit of fuel in the oil. Thanks for advising.

edit as far as the fuel pump goe's I previously mentioned I don't even know where it's located. I belive MParr is correct about the gravity feed fuel.
I did turn the key switch to ignition turning engine over this is when I observed the fuel shooting straight up real high.
 
Is this your correct engine number?
219907-0131-B1 - Briggs & Stratton?
If not, please list the model number and serial number.
 
The Brain said:
yes that is the correct engine# as ingraved on the valve cover.

View attachment 72324
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I believe that this is your carburetor. Some of the others on here can confirm.
shop.briggsandstratton.com

Briggs & Stratton 593432 Carburetor

Genuine replacement carburetor for single cylinder engines. This OEM part is used on select 21 cu. in. vertical OHV engines and ensures proper fit and performance to maintain the life of your Briggs & Stratton engine. Many parts look similar, so it’s crucial to ensure you’re choosing the right...
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@ILENGINE
@Auto Doc's
 
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