Is 200psi too high

[jay760]

Just tore the engine down thinking it was the crank gone, and expecting to see a mark on the piston, its actually the valve touching the spark plug as it opens

 

[arcticXS]

So a 0.62 mm spark plug shim should index the plug 180 degrees, and solve that issue.
I sort of thought that ensuring that the ground strap is pointing away from the center of the combustion chamber is a common practice when chasing the last fraction of a horsepower.

 

[jay760]

So a 0.62 mm spark plug shim should index the plug 180 degrees, and solve that issue.
I sort of thought that ensuring that the ground strap is pointing away from the center of the combustion chamber is a common practice when chasing the last fraction of a horsepower.

Always used to index the plugs, but got fed up with people telling me it was a waste of time, so when I changed plugs I didn't bother this time, just goes to show it was the right thing to do, I'll take the valve out to make what position the plug needs to be in to miss the valve