42948A7 Mercury Throttle Cam Assy | Genuine Used Part

🔧 Product Description

Genuine Mercury Mariner Throttle Cam Assembly - Part Number: 42948A7

A genuine used Mercury Mariner throttle-cam assembly for selected three-cylinder two-stroke outboards.

The shaped cam coordinates carburettor throttle opening with movement of the spark-advance linkage. Its profile is critical to the factory link-and-synchronisation sequence.

⚙️ Key Features

• Genuine Mercury Marine OEM throttle-cam assembly
• Correct current Mercury part number 42948A7
• Supersedes earlier 42948T and 42948C2 references
• Used on 65 Jet and 70HP to 90HP three-cylinder engines
• Controls the relationship between throttle opening and ignition advance

🚤 Compatibility

Commonly used on

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

Typically suits

• Engine models:
• Mercury / Mariner 65 Jet - US serial 0D283222 through 1B000001 and above across the applicable groups
• Mercury / Mariner 65 Jet - Belgium serial 9793577 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 to 1B000001 and above
• 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 to 1B000001 and above
• 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 cam converts control-lever movement into a programmed sequence of carburettor opening and spark advance. Its profile ensures the ignition and throttle systems remain synchronised through idle, acceleration and full-throttle operation.

⚠️ Common Signs of Failure

• Cam surface is worn, cracked or damaged
• Roller does not track smoothly over the cam profile
• Throttle opens too early or too late in relation to ignition advance
• Engine hesitates during acceleration
• Link-and-sync adjustment cannot be set correctly

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 42948A7 → Supersedes 42948T
• 42948T → Supersedes / relates to 42948C2
• 42948C2 earlier cam reference

OEM / Related Numbers

• 42948A7
• 42948T
• 42948C2
• 42947 1 related spark-advance lever
• 24-55162 related spring
• 24-14159 related cam-return spring
• 745061148994

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

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