Mercury 25-60 HP 4-Stroke — service specifications

What is the spark plug for Mercury 25-60 HP 4-Stroke — service specifications?

For Mercury 25-60 HP 4-Stroke, spark plug is NGK BPR6ES; gap is 0.040" (1.0mm), recorded from its source on 2026-08-05; source re-checked 2026-11-01.

25-60 HP 4-Stroke | NGK BPR6ES | 0.040" (1.0mm)

— seasierra.com, retrieved 2026-08-05

Verified2026-11-01

Review by2028-08-04

The value above is stated away from the sentence quoted with the answer, so the passage that states it is shown here too.

Brand

Mercury Outboards Model | Spark Plug | Gap |

— all from seasierra.com, retrieved 2026-08-05

seasierra.comhttps://seasierra.com/blogs/outboard-101/outboard-spark-plug-replacement-the-right-plugs-and-gaps

Last verified against source: 2026-11-01. Due for re-check by 2028-08-04. This page as Markdown · OKF bundle · full dataset as JSON.