429471 Mercury Spark Advance Lever | Genuine Used Part

🔧 Product Description

Genuine Mercury Mariner Spark Advance Lever - Part Number: 42947 1

A genuine used Mercury Mariner spark-advance lever for selected three-cylinder two-stroke outboards.

The lever forms part of the combined throttle and ignition-timing linkage. It moves the trigger or timing mechanism in relation to throttle opening so ignition advance follows the engine's operating speed and load.

⚙️ Key Features

• Genuine Mercury Marine OEM spark-advance lever
• Correct Mercury reference 42947 1 / 429471
• Used across 65 Jet and 70HP to 90HP three-cylinder linkage assemblies
• Works with throttle cam 42948A7 and the associated return springs
• Maintains the designed relationship between throttle opening and ignition timing

🚤 Compatibility

Commonly used on

• Mercury and Mariner three-cylinder throttle-lever and ignition-advance systems
• 65 Jet plus 70HP, 75HP, 80HP and 90HP two-stroke outboards

Typically suits

• Engine models:
• Mercury / Mariner 65 Jet - US serial 0D283222 to 0G760299
• Mercury / Mariner 65 Jet - US serial 0G760300 to 0T979999
• Mercury / Mariner 65 Jet - US serial 0T980000 to 0T999999 and 1B000001 and above
• Mercury / Mariner 65 Jet - Belgium serial 9793577 to 0P016999 and 0P017000 to 0P325499
• Mercury / Mariner 70HP three-cylinder - US serial 0A996142 to 0C221999
• Mercury / Mariner 70HP three-cylinder - Belgium serial 9483121 to 9589038
• Mercury / Mariner 75HP three-cylinder - US serial 0A996142 through 1B000001 and above across the applicable catalogue groups
• Mercury / Mariner 75HP three-cylinder - Belgium serial 0P325500 and above
• Mercury / Mariner 80HP three-cylinder - US serial 0A996142 to 0C221999
• Mercury / Mariner 80HP three-cylinder - Belgium serial 9483121 to 9589038
• Mercury / Mariner 90HP three-cylinder - US serial 0A996142 through 1B000001 and above across the applicable catalogue groups
• Mercury / Mariner 90HP three-cylinder - Belgium serial 0P017000 and above
• HP Range: 65 Jet / 70HP - 90HP
• Engine Type: Mercury / Mariner three-cylinder two-stroke outboard
• Year Range: Approximately mid-1980s - 2000s

🔌 Function

The lever transfers throttle-linkage movement to the ignition-timing mechanism. Correct lever geometry is required so the engine advances timing progressively rather than remaining retarded or advancing too quickly.

⚠️ Common Signs of Failure

• Lever pivot is worn or seized
• Lever is bent, cracked or heavily corroded
• Ignition timing does not advance smoothly with throttle movement
• Engine hesitates, lacks power or detonates because timing movement is incorrect
• Excess linkage play prevents accurate synchronisation

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 42947 1 current OEM service reference
• 42947 earlier Mercury base reference

OEM / Related Numbers

• 42947 1
• 429471
• 42947
• 42948A7 related throttle cam assembly
• 24-55162 related throttle / spark-advance spring
• 24-14159 related cam-return spring

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated