Spark Plugs

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What spark plug should I use?

The vast majority of seagulls use an 18 mm plug. It must be a short reach, to avoid damaging the piston. The most common used and found), are NGK A6, or the D 16.  The old 8 Com is not  available now, except old stock.

There is also a Bosch version of the D16,  the  Bosch M 10 A C but it is not generally found.

  Exceptions to the above!

  All Q.B. seagulls, the Kingfisher, Osprey and  Curlew :-

  use a 14mm, either, Champion N4 or RN4. 

or NGK B7ES or BR7ES.

  (The ‘R’ denotes a resistor plug.)

  The Model 125 and 170 (the ones with cowlings):-

  Champion N4,