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Hi guys, I am newbie,
My tractor was making loud sound despite routine maintenance and only 100 hours I opened up the hood and found burned harness wires on R side and saw this small gap as noted in picture, what do you guys think has happened here? I am attaching images here. Thanks!

I think is started out with furry little critter syndrome that resulted in an electric short.

Agree, you can see mice chewing on wires here. Lucky the mower didn't burn to the ground.

Haha, luckily mice is ok, what you guys think of engine block marked in red small circle?, will changing wires fix the issues, sorry I am really new to this.

That line is the head gasket overhanging the block and is no problem unless the gap is actually a hole
Put some soapy water then and crank the engine with the spark plug disconnected but still in the hole
If you see bubbles or foam at the gap then you have a blown head gasket which will need to be replaced

If

Sfwya said:

Haha, luckily mice is ok, what you guys think of engine block marked in red small circle?, will changing wires fix the issues, sorry I am really new to this.

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Repair the wires with solder and heat shrink tubing. Or install a new wiring harness.

Unless something else was chewed on, should fix this issue.

Sfwya said:

Hi guys, I am newbie,
My tractor was making loud sound despite routine maintenance and only 100 hours I opened up the hood and found burned harness wires on R side and saw this small gap as noted in picture, what do you guys think has happened here? I am attaching images here. Than

Click to expand...

Sfwya said:

Hi guys, I am newbie,
My tractor was making loud sound despite routine maintenance and only 100 hours I opened up the hood and found burned harness wires on R side and saw this small gap as noted in picture, what do you guys think has happened here? I am attaching images here. Thanks!

Click to expand...

Visually appears to be a blown head gasket. Just turning the engine over you should detect a compression leak at the location you have marked with a circle. You could also remove the plugs and do a compression comparison between the two cylinders. The wires look like they've been melted by heat from the blown gasket.