Hi I have the riva rec heads on my gp1200r. I am supposed to be using the stock br8es-11 plug. I have noticed that when I am changing my plugs that the gap is smashed closed. It wasnt like this with my stock head. Any ideas?

sounds like the crank rod beaing has failed - this allows the piston to travel farher than it is supposed to

if I am right the motor needs to come out and be rebuilt

This message has been edited. Last edited by: Philip_GPR,

It's highly unlikely the piston hit the plugs because of the shape of the domes. Detonation could be causing this. What grade/type of fuel are you using?

Pull the heads and inspect the pistons. If there is any pitting in the pistons then you know your motor is detonating; in a bad way.