# 75-115 HP 4-Stroke — Outboard motor service specifications by brand and model

For 75-115 HP 4-Stroke, brand is Mercury; spark plug is NGK IZFR6K-11S; gap is 0.043" (1.1mm), recorded from its source on 2026-08-05.

- **Brand:** Mercury
- **Model / range:** 75-115 HP 4-Stroke _(verified: appears in the quote below)_
- **Spark plug:** NGK IZFR6K-11S _(verified: appears in the quote below)_
- **Gap:** 0.043" (1.1mm) _(verified: appears in the quote below)_

## What the source says

> 75-115 HP 4-Stroke | NGK IZFR6K-11S | 0.043" (1.1mm)

## Source

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

Last verified: 2026-08-05. Review by: 2028-08-04.
Part of [Outboard motor service specifications by brand and model](https://referencesource.org/outboard-motor-service-specs/).