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Message: <blockquote data-quote="Rednaxs60" data-source="post: 231834" data-attributes="member: 4617">Spark plug gap.  What should it be?  For most of us, the OEM recommendation is the best spark plug gap.  For the adventurous, the spark plug gap can be experimented with.  Wider, narrower, all requiring experimentation and a good plan to determine what spark plug gap works best.  This is much like tuning the VE (fuel) table.  Start at a good compromise.  Have sets of spark plugs with the spark plug gap noted.  You could start with the OEM recommendation, generally 0.035", have other sets gapped at 0.040" and 0.045", and smaller at 0.030", 0.025".  Note how the engine operates with each set of spark plugs, this will be seat of the pants tuning.  Give each set of spark plugs a good chance for success.  Operate the engine over a one or two week time frame and assess the engine performance.  If the engine performance is less than expected before the end of the trial period, change out the spark plugs, use a different set.A wide gap creates a longer spark and may lack sufficient oomph to adequately ignite the air-fuel mixture.  A smaller gap creates a short intense spark and is regarded as a better option, especially when dealing with richer fuel mixtures.Spark plug gap orientation.  Another tried and true tuning issue.  This is where you orient the spark gap so the open section between the ground electrode and centre electrode is oriented such that the spark plug flame is more accessible to the air-fuel mixture.  To do this you mark each spark plug so that you know the orientation of the spark plug gap.  Install the spark plug to orient this gap with the position of the intake valve.  If the spark plug gap requires adjustment, add or remove washers to suit.</blockquote>

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