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kilabeez0
05-18-2008, 08:46 PM
I did this with a C clamp removing it from the head. Is this salvagable or did I ruin it? I'm thinking I ruined it.

http://i19.photobucket.com/albums/b169/kilabeez0/May08all409.jpghttp://i19.photobucket.com/albums/b169/kilabeez0/May08all410.jpg

http://i19.photobucket.com/albums/b169/kilabeez0/May08all411.jpg
http://i19.photobucket.com/albums/b169/kilabeez0/May08all413.jpg
http://i19.photobucket.com/albums/b169/kilabeez0/May08all414.jpg
Honda#4
05-18-2008, 09:12 PM
I wouldnt use it.
the Z Man
05-18-2008, 09:20 PM
X2
I have an extra exhaust vavle if that is what it is, 450r 04-05
GPracer2500
05-19-2008, 01:46 AM
Even without that damage it looks like it needs to be replaced. The seat face appears to have distinct cupping.
wilkin250r
05-19-2008, 02:13 AM
Originally posted by GPracer2500
Even without that damage it looks like it needs to be replaced. The seat face appears to have distinct cupping.

Really? I don't see any cupping.

To the original question, yes, that valve is ruined. It's possible that a skilled machinist could make it usable again, but it would be risky, it would be weak in that area, and it's just not worth the risk and hassle.

New valve.
GPracer2500
05-19-2008, 05:24 AM
Originally posted by wilkin250r
Really? I don't see any cupping.

To the original question, yes, that valve is ruined. It's possible that a skilled machinist could make it usable again, but it would be risky, it would be weak in that area, and it's just not worth the risk and hassle.

New valve.

Yeah? Those sure look like steps that shouldn't be there.

http://i34.photobucket.com/albums/d133/gpracer2500/May08all413.jpg

Maybe I'm seeing something that's not there but I'd swear I see them in every one of those pictures that show the face. I bet if you ran your finger along there you'd feel a ridge on the top and bottom edge of the face.
Honda#4
05-19-2008, 06:27 AM
I can also see what GP is seeing, it does seem like it dishes some.
wilkin250r
05-19-2008, 11:34 PM
Maybe it's a toe-may-toe/toe-mah-toe issue.

The valve face looks worn, yes, I'll agree to that one.

But as far as I know, that isn't referred to as "cupping". That's just a worn-out valve. Cupping is when the sides of the valve begin to turn upwards, also called tuliping. It's generally a combination of excess heat, and excessively high seating pressure or a mis-match of angles between the valve seat and the valve face.

http://www.bassoassist.com.ar/imag/fa08.jpg
GPracer2500
05-20-2008, 02:45 AM
Yes, I think our confusion is in the semantics.

I believe you're right that a "cupped valve" is distinguished by the margins of the valve being bent in such a way that the edges form a cup shape out of the valve head. When I said "...seat face appears to have distinct cupping" I was trying to describe the wear on the sealing surface of the valve only. I should be more careful about using the word "cupping" to describe that kind of valve wear.