Mercury Technical Database

Mercury 80hp (Inline-4)

Name: Mercury 80hp (Inline-4) Outboard Motor (1975)
Brand: Mercury
Availability: OutOfStock

80 HP 1975 2-Stroke Discontinued ✓ Service Data Verified

Smaller Model 80hp (3-Cyl 2-Stroke)

Current Model 80hp (Inline-4)

Larger Model 85hp (Inline-4)

General Specifications

HP / kW 80 HP / 59.6 kW

Displacement 1090 cc (66.5 cu in.)

Cylinders 4 (Inline)

WOT RPM 4500 - 5500

Weight 95 kg / 209 lbs

Drive & Lower Unit

Gear Ratio 2.07

Shaft Length 15", 20"

Electrical System

Alternator Output 201 Watts

Starting System Electric

Technical Maintenance Toolkit

Verified service specifications for the Mercury 80hp (Inline-4) (1975)

Lubrication

Engine Oil

TC-W3 2-Stroke

Gearcase Lube 440 ml

Ignition System

Spark Plug

NGK BUHW (Surface Gap)

Firing Order 1-2-3-4

Performance Specs

Idle RPM 700 ± 50

WOT Range 4500-5500

Alternator 201W

Standard Maintenance Intervals

20H Break-in Service

100H Annual Tune-up

300H Water Pump & Seals

Identification

The serial number for the Mercury 80hp (Inline-4) is typically found on a plate located on the transom bracket.

Technical Toolkit

Compare this 80HP engine → Identify your model year → Decode error codes → Propeller guide for this 80HP →

Maintenance Compatibility

These models share common service parts with the Mercury 80hp (Inline-4):

Model Evolution

History of the Mercury 80HP series over the years:

1995 80hp (3-Cyl 2-Stroke)

Category Discovery

All 80HP Motors Full Mercury Index 1970s Archive

Embed Specs on Your Site

Share these 80hp (Inline-4) specifications on your blog, forum, or dealer website.

<iframe src="https://outboarddata.pages.dev/embed/outboard-motors/mercury/mercury-80-inline-4-1975" width="100%" height="300" style="border:1px solid #1e293b; border-radius:8px;" frameborder="0" title="Mercury 80hp (Inline-4) Specifications — OutboardData"></iframe>

Reference Data

Information compiled from Mercury Marine factory service manuals and original sales literature published in 1975.