Heads?

[AFM327]

Anyone have problems with heads cracking between the sparkplug and the valve seats? I did a search and didn't find any reports. Over the past few years I've had two heads crack this way. Very small and hard to find. They only open up enough when the motor gets hot, Then it pressurizes the cooling system making it puke water. It was never bad enough to hurt anything, I would just come off the track and, it would be hot and you could smell it and it would push a small amount of water out of the overflow bottle. I haven't had that problem in a couple years but did lose two heads this way. I've heard reports of the old ZXR750 having similar problems.

[zimm]

Anyone have problems with heads cracking between the sparkplug and the valve seats?

not yet

[cargo]

nope and no plans to either