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Spark plug analysis

1K views 1 reply 2 participants last post by  BlackBox 
#1 ·
Had the LET plugs out during the week:





What do you think, spot on or running a tad rich?
Initially I thought definitely rich but after a quick browse around various techy sites it seems they're perhaps nearer spot-on. Certainly the timing marks look good on pot 1.
( The divot on the pot 4 plug is courtesy of an inquisitive fingernail :eek: )
 
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