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Old 06-17-2013, 09:54 PM   #17405
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Joined: Dec 2005
Location: Pacific NorthWet, Napa Valley North
Oddometer: 5,852
Originally Posted by jimjim View Post
Bueller - I think if you compare your spark plugs to new ones you will find that the center electrode will be visibly worn as mine were.

OEM-quality spark plugs are cheap, and you may not be able to visibly detect functional issues. I once found one that would spark fine in open air, but not under compression at TDC.

Sort of like doing a timing belt on a car- most likely you have to muck with the water pump anyway, might as well replace it while you're there, and hey, crank main seals are cheap and you're right there- why would you not replace it?
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