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Man, that exhaust valve didn't take long to coke up. Have you tried to clean them up? It doesn't look like there is any damage there. If they clean up ok and seal let's hope on the next run the rings wear in and seal up a bit better. I wonder if the crankcase pressure was a bit high and that was...

That looks like you were burning a good bit of oil. Was your oil level dropping? I'm going to have to take a better look at the photos after work.

That is about the end of what I can suggest. The next step for me would be to pull the head and look at the valves and seats.

That is pretty unusual. This may sound odd but... Try tapping the valve stem with a hammer. You want to give them a nice pop against the seat. See if that seals them back up. Edit - You can do it with the air pressure on the cylinder. It will make some noise when it pops open then closed.

Ouch. Can you determine the source? Valves or piston??

Nope. Don't keep trying to start it. Can you pop out the injector and use your air injection thingie to see where the leak is?

Edit - defer to post below.

Not unusual. How long did you let it run loaded? The smoke should have tapered off as the rings wear in. Did you set the gaps on the rings?

Great news. One of the things I personally do for a first start is I set the valves a few thousands looser than spec. I don't run the engine very long on its first start. Maybe 1-2 minutes. I will then go back and check valve lash and set it to spec.

Cool. I hope they fix you up so you are ready to go.

Before you do that take it to a machine shop and have them look at it. They may get you going for just a few bucks.

Sure m

Thats a bummer about the valve sealing. For auto heads we test them before putting them back on the engine by putting some acetone in the combustion chambers and look for leaks. That isn't practical here since the head doesn't have a combustion chamber per say. Glad you caught it before...

A good option is to use the John Deer break-in oil.

Looks like you got them shallow enough to let go of the carbon. That will be much better.

Hm. This is tough one. In the spirit of transparency, this isn't how I would run it BUT... Since you are already headed down this path, I would hone it one more time and carefully compare the results with what you have now. If the vertical scratches don't lighten up you'll have to decided if...

Yes and the resolution still sucks.

Its hard to tell by the photos but it looks like the top ring is the silver one. It looks like the one with the matte finish is tapered.

Looks good to me.

Can you expand on the lapping comment? We were always taught to lap the valves until you have the correct width contact area (verified by bluing) then stop. You don't lap a valve until it completely covers the seat. That leaves no room for it to wear in over time.