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In one post, you mentioned puffs of black smoke. That is indicative of a carburetor problem. Why did you replace the carburetor and where did you get it? Did you save the OEM carburetor? I would be tempted to rebuild it or have someone rebuild it.

Make sure you installed the filter with the flow in the correct direction.

I don't know. I'd have to have the thing in front of me and even then may not be able to tell. I'm guessing some things got bent.

Looks to me like the pulleys are out of alignment.

How could they have ground the valve seat off center? I've ground a few valve seats and the stone is guided by a collet-type tool that centers itself in the valve guide.

Is the valve guide that worn? Or does it even have guides, meaning the block is either severely worn or the hole for the valve stem was mislocated from day one?

How old do you think gas is when you get it?

Where is "around here?" Look on https://www.pure-gas.org/ for places that sell non-ethanol gas. The problem is, you're adding another chemical of unknown composition to cancel out an unwanted contaminant (ethanol). I'd rather just do without the ethanol in the first place, not try to...

What's 'after hours' got to do with it?

Save your money. Buy non-ethanol fuel and be done with it.

An electric powered robotic mower isn't going to have enough charge to mow the tiniest of cemeteries. Unless it's a two-grave family plot.

How are you checking that the carb reliably fills?

Sounds to me like you have a blockage in the fuel line.

I'm by no means a Grasshopper expert but it sounds like you lost hydraulic pressure. Is the deck raised hydraulically? If so, can you raise it? If you can't, that means the pump has failed or has become disconnected from its drive source. The 725D is a heavy duty zero turn with a horizontal...

How about the air filter? Take off the fan housing and clean cylinder and head fins?

How much are you trying to take off? Reel mowers aren't meant to take off a lot.

The other symptom that seems to be overlooked is the fact that the valve cover was leaking oil "badly." That indicates (to me) that exhaust gas leaking past the valve stem is the problem.

If this engine is still under warranty (30 hours), I'd let the dealer take a look at it. If not, I'd remove that head and look at it myself.

Does the other exhaust valve look like this?

Do the spindles all have the same type and number of washers, spacers, etc. above the blades? Did the spindles get removed and replaced? Are the blades all the same thickness?

Try your old diaphragm or rob another one out of one of your kits.

Did you fill the tank or just put in a little bit of gas? Did you replace the pickup tube and if so, how close is it to the bottom of the tank? What I'm wondering is if there isn't enough fuel in the tank and tipping the mower back covers the pickup with gas.

If you have the repair manual, that's going to be your best source of information.

On swing cylinders, I suspect that the top of one cylinder is connected to the bottom of the other because you're pushing with one and pulling with the other.

During power outages, it doesn't matter how close you are to a gas station--it's too late to get gas.

A very abrupt stop of the engine. There may be more damage than what you see in the photo.

Try welding it first. You can always resort to Plan B if that doesn't work. Have your welder strengthen it with a gusset.

It's possible to put in too much gas. Try a new spark plug.

It looks as if you've been mowing soupy mud. Mowers don't like that. If you want your mower to last a long time, the less of that you do, the higher your chances will be for a long-lived mower.

Diesels need two things to run--enough compression to heat air above the ignition point of diesel fuel and a correctly timed injection of fuel. Barring an internal mechanical failure of valves, pistons, etc., compression will not be an issue, especially to an engine that was already running...

It's a 2-cycle. I've got one just like it. I wish they were still made.

Finding TDC is completely unnecessary and from the description given by the OP, that's exactly what he did--he found TDC, except it was the wrong one.

Get something with a horizontal shaft engine. They'll live longer, especially if operated on slopes.

I would take that article with a grain of salt. For instance: "Diesel mower saves 700 gallons of fuel every day, and it saves money for the long term. " and "Cummins engines have a displacement of 2.8 to 95 liters. " 700 gallons saved per day? It must be the 95 liter engine.

This problem has been discussed at length in either the Grasshopper forum or Kubota forum. It's a fuel starvation problem. Go over there and read about it or re-post your problem there. If you had a fuel pressure gauge, it would NOT look good.

I'm not. I never got the A&P or IA (inspector) license a real aircraft mechanic is required to have. I did a lot of work on airplanes, both other people's and my own, but all my work had to be inspected and signed off by an A&P or IA. That was during college and once I graduated, I moved...

When I was in college, I worked PT for a guy who owned a fleet of WWII bombers, patrol planes, and freighters (Douglas A/B-26, Lockheed PV-2, R5D, and Douglas DC-7) used as air tankers. Most had either the P&W R2800 or R2000; the -7's had R3350's. IIRC, the bottom cylinders used dual wire...

Must've had an impulse coupling.

For some companies, there's good money in going broke. The virus is a convenient excuse. I was unaware that it stunted the growth of grass.

Grounding the plug and looking for spark is more of a verification that the ignition system is working.. There are a lot of pure garbage videos on youtube. In most cases, you have to already know what you're doing to be able recognize garbage when you see it.

Are you engaging the mower at one of the extremes of its cutting height? If so, find the height where the pulleys are as close as they get to being in the same plane and engage the mower there, then raise or lower it to the cutting height you want..

A friend's Kawasaki-powered Gravely did the same thing. It was a bent pushrod. The engine was only running on one cylinder.

EOIC (Exhaust Opening, Intake Closing) Method of Adjusting Solid Lifter Valve Clearances 1. Remove the valve cover(s). 2. Identify the intake and exhaust valves. You have to know which is which. 3..Determine which direction the crankshaft turns when the engine is running. You do not have...

If you know how fast the mower travels and how fast the blades spin, you can figure out the 'advance ratio' aka how far the mower advances for each half revolution of the blade. I'm betting it will be less than the sharpened portion of your blades. For instance, a blade spinning 3600 rpm on a...

If you itemize your taxes, you can donate the mower to a charity and deduct that amount from your income. They typically are pretty generous on the declared value.

Did it do this before you adjusted the valves?

Make sure you turned off the mower PTO switch if it has one.