878550 Mercury Throttle Lever | Genuine Used Part

🔧 Product Description

Genuine Mercury 115HP EFI Primary Throttle Lever - Part Number: 878550

A genuine Mercury primary throttle lever for Yamaha-manufactured 115HP EFI four-stroke outboards.

The lever pivots within the engine-mounted control mechanism and transfers movement to the throttle-body linkage. It works with control lever 878548 and the associated spring, collar and washer arrangement.

⚙️ Key Features

• Genuine Mercury throttle lever
• Correct part number 878550
• Used on Yamaha-built Mercury 115 EFI engines
• Factory cable and linkage attachment points
• Matching companion to lever 878548
• Suitable for the complete documented 115 EFI serial range

🚤 Compatibility

Documented on

• Mercury 115HP EFI four-stroke, serial 0T178500-0T800999
• Mercury 115HP EFI four-stroke, serial 0T801000-1B226999
• Mercury 115HP EFI four-stroke, serial 1B227000-1B366822
• Engine Type: Yamaha-manufactured Mercury inline-four EFI four-stroke outboard
• HP Range: 115HP
• Fitment Requirement: Confirm pivot hardware and linkage orientation

🔌 Function

The primary lever changes the direction and ratio of control movement so the throttle body travels smoothly from the idle stop to full-open position.

⚠️ Common Signs of Failure

• Throttle has excessive free play
• Full throttle cannot be reached
• Lever or pivot bore is worn
• Linkage does not return to idle
• Lever is bent or contacts nearby components

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 878550 current documented throttle-lever reference
• No direct supersession confirmed

OEM / Related Numbers

• 878550
• 878548 related throttle-control lever
• 12-84974M flat washer
• 13-81868M wave washer
• 24-804343 return spring
• 10-881375 pivot bolt
• 23-881378 collar
• 18-859746 cotter pin

Aftermarket / Verified Equivalents

• Specialist used Mercury 878550 throttle lever
• Used complete Mercury 115 EFI throttle-control assembly
• No verified direct Yamaha service-number cross-reference
• No verified direct aftermarket lever

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated
• Check linkage adjustment after installation