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Which risk follows from fitting a plug of incorrect reach?

  • A.No risk
  • B.Overheating of the plug, which occurs because the heat path to the head is altered by the incorrect reach fitted
  • C.Piston contact or exposed thread carboning up
  • D.A weak spark, which follows from the electrodes being positioned incorrectly within the combustion chamber

Answer: C

Too long a reach can strike the piston, and too short leaves exposed thread that carbons and seizes. Heat path genuinely changes as well, which makes the last option a real consequence. Reach must match the head exactly. Naming what changes and what stays the same is the reliable route through questions of this shape. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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