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Discussion Starter · #1 · (Edited)
Pulled out the spark plug to run a compression test on my newly acquired 700xx and found this; some moron installed a Denso IKH20 Iridium plug, this plug has a 26.5mm reach the correct plug is a 19mm reach! amazingly there appears to be no damage to the piston, also the compression is 110 psi. any comments about that?
 

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Wow that plug was toast! Hard to believe no damage with the extra length. As far as the compression, sounds pretty high! The manual says 65psi?


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Quick, what would cause the compression to be that high?

Usually carbon build up, either on the top of the piston or in the combustion chamber?

But idk if I'd worry to much about it, I'm pretty sure I've seen others post about compression higher than the manual. Almost as if the manual was incorrect, but I'm not sure?
 
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