<< Del Johnson wrote:
 > >>
 > >>  What is the recommended spark plug for the 13B NA engine for aircraft
use?
 > >>
 > >>  Thanks in advance!

 Ken Welter wrote:
 >
 >    The best I have found is the NGK BUR9EQP but I am open for
 > suggestions if there is a better one for longer life, I get about 75
 > hr. on them before the electrode erodes away.
 >
 >    Ken
  >>

I use the racing plugs NGKR6725-115. Find a cold or similar plug on a heat
range chart. Run as cold a plug as will remain clean in your engine.

These are retracted gap. Very cold heat range, wire electrode. I use the same
plug all year.

Many dirt bikes have to run very cold plugs, and those cost far less than the
nucs at $25.00 each.

Lynn E. Hanover

Loss of electrode material would suggest too hot a heat range.

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