Mercury 200-300 HP 4-Stroke — service specifications
What is the spark plug for Mercury 200-300 HP 4-Stroke — service specifications?
For Mercury 200-300 HP 4-Stroke, spark plug is NGK ILZFR5B-11; gap is 0.040" (1.0mm), recorded from its source on 2026-08-05; source re-checked 2026-11-01.
200-300 HP 4-Stroke | NGK ILZFR5B-11 | 0.040" (1.0mm)
— seasierra.com, retrieved 2026-08-05
- Brand
- Mercury
- Model / range
- 200-300 HP 4-Stroke verified
- Spark plug
- NGK ILZFR5B-11 verified
- Gap
- 0.040" (1.0mm) verified
Where each value comes from
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
Source
- seasierra.comhttps://seasierra.com/blogs/outboard-101/outboard-spark-plug-replacement-the-right-plugs-and-gaps