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Is 200psi too high

Discussion in 'The Garage' started by jay760, Apr 29, 2021.

  1. jay760

    jay760 XS650 Guru

    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 20210503_180958.jpg
    arcticXS, Jim, Mailman and 3 others like this.
  2. arcticXS

    arcticXS XS650 Guru Top Contributor

    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.
    Jim likes this.
  3. jay760

    jay760 XS650 Guru

    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
    arcticXS likes this.

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