| Well if the valve is open and the piston smacks it one then something has to give. I have seen rockers break on engines that have been seriously over revved but i'm not sure if the desmo would fail like that. I dont think the broken rocker would affect the belt tension. The head needs to come off really or you might be able to find someone with an endoscope to have a shuftie down the spark plug hole to check for damage to the piston crown. |