'12 310 bent ex valve.

So I picked up a motor from a guy who had a small nut fall into his airbox while the filter was out.

The nut entered the combustion chamber and ended up between the piston and one of the exhaust valves stopping the motor and apparently bending an ex valve.

The piston has two small indentations on the same valve pocket where the typical crown carbon is missing from the impact. if you clean away the carbon you would not even see it. That valve has one very slight matching imprint on its face. That valve is not quite closing all the way. when you peer into the ex port you can see a little light at the seat. i guess it is bent and hanging in the guide. The guy tells me he took it apart as soon as it locked up and found the nut.

The cam journals and the other valves look okay. When i spray WD40 behind all the other valves I only see a tiny bit of dampness seep through after like 10 minutes. They look sealing pretty tight to me. Only one intake valve clearance is a little tight @ .003 the other is .004 and the unaffected exhaust is .008

The piston, cylinder look normal as well. Just a little skirt wear on the exhaust side as usual.
The Rod and crank feel fine to me. No up and down.

So.....what do I do?

Slap a valve in and call it a day, or send it out to be looked at? How can I assess the valve guide?
I really don't think the bike was run after the initial hit as there are only two small marks on the piston and one on the valve. i don't think it touched the intake valves at all.

What about the crank? This motor has little use on it and although I can, I'd rather not split the cases.

Opinions?

Me? I'd stick a new valve in it and lap it in good to make sure it was seated.

I did one not too long ago where owner gave me the wrong piston and both valves hit the piston eyebrows and bent two valves a little.

Put two new valves in/lapped and ordered the correct piston. Still runs great.
Just make sure valve guides/valve seats/head/piston, there are no cracks.

Can you lap TI valves?

Depends if they are coated? Totally forgot that! If they are then try to fit them and fill with fluid to see if they leak.

If they leak then you might have to have seats ground at bike shop.

Stock Husky TXC310 valves.

The remaining 3 valves hold WD40 for an hour with just a little dampness showing around the seat.

I turn the head sideways and it all dumps out the port.

The paper towel under the head stays dry.

That sounds okay?

Yeah think your ok on those.

I'm gonna drop a new valve in it and run it.

The exhaust cam felt a little tight in the journals but I took it out and cleaned a couple specks of dirt out with my fingernail and it spins fine now. Must have trapped a piece of dirt in the cap when I put it on.

The other valves are tight and all in spec except for one a thou tight.

I'll look over the valve guide when I take the valve out.

So the valve is out. Just bent a little and leaks at the crown a little.

I'd like to clean the valves but they are stock TI as far as I know.

Can I clean them with scotchbrite and WD-40?

What about the seats?

Can I scotchbrite them?