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If you do a run up to the RPM that you use to check
the mags, lean until it starts to drop. Note this position on the mixture and
always use it after the start. As Walter said, this is your best setting until
departure. I teach this to many pilots who get stuck on the ramp with fouled
plugs. It is amazing how they have never heard of this technique. Adding excess
fuel at lower temps[Taxi] allows lead to form by gravity{heavy metal] on the
bottom plugs. 99% of the time the fouled plug is the bottom plug. Jim
Rogers
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