I wouldn't be surprised if 1/2 or more of the oem heads on 10+ year old quads are cracked just like that. I know my buddy has been running one with a crack for about 9 years

 

Wtf? I would never be running a bike with a cracked head.
Because when something happens and you trace the issue back to that crack, you're going to be pissed at your self.

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If your head is more the a few years old I would bet you ARE running a cracked head.

 

All but one head I've ever run has cracked into all 4 valve seats. Most likely it's ok to run but I wouldn't put any money into a valve job or other work. Cracks are common.

 

Goudreau solutions mécanique have a fix for this problem while new seats are installed.

 

What's the fix and how well does it hold up?

Sheerider, no honda? Are you a spy for the other guys on our 10 year old technology

 

Lol yeah I'm applying it to my 20 year old smoker.

But I bet millennium could fix it no issue. Or any competent builder.
I'm sure baldwin could point you in the right direction

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They weld and recut the whole aera, seem to hold up well, they have many heads out for testing. I don't have one personnaly since I just get 5 angles stock seat and valves.

 

If its a hair line crack its awfully common. Mine has been that way since i got it and ive been running it for 3 years now. I cant imagine it causing any problems unless you go to really high comp and a big bore. even then, i thinks its unlikely to cause a failure. I think if honda had seen issues with it they (hopefully) would have increased the distance from seat to plug to stop it from happening.

 

It is very common usually will not hurt anything it can be fixed