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Originally Posted by sloride
If it is not broken, do not worry about fixing it. I am sure some will chime in about why change motor oil, etc.
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Quote:
rocky racoon
I do it every Fall and test the plugs as ROLLGUY suggests. Make sure they glow quickly and AT THE TIP not just on the shank.
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The only (or should I say best) way to know if they are "broken" is to pull them and test with 12v. A plug can ohm out fine, but the "acid" test is to power them up and see how long it takes for the tip to get red hot (comparing them against themselves). I thought the no-start condition on my 240 might be GP related, so I pulled them to test so I could rule that out. Testing with a multimeter is not the most accurate way in my opinion.