Originally posted by LarryBible
If you will gap them a little tighter than factory spec at .035, you will get a better idle and you can get 30,000 before changes without any trouble as long as the engine is in good shape and running right.
What is the factory gap spec?
.035" is about 0.9 mm. Earlier in this Forum, the recommended gap mentioned was 0.04" (=1mm), claiming a bigger gap gives a bigger spark, giving a better ignition, giving a better idle.
Have my plugs now at 1mm, and engine idle's fine.