The ARP Throttle Arm Stud Kit from Buckshot Racing 77 is a direct, high-strength replacement for the factory Mercury throttle lever screw (OEM #818165). Designed for 1976–2005 Mercury and Mariner 2-stroke V6 outboards, this kit fits all 2.0L, 2.4L, and 2.5L engines and provides a more stable, reliable, serviceable connection between the throttle arm and pivot shaft.
The kit includes one (1) broached ARP chromoly Allen-head stud, one (1) stainless steel washer, and one (1) stainless steel nylock nut. The Allen key allows controlled torque during installation without stressing the throttle arm threads, improving repeatability and service access without relying on threadlock compounds.
Engine Fitment and Model Compatibility
This kit fits all Mercury 2-stroke V6 outboards using the standard starboard-side throttle linkage arm. It is compatible with carbureted, EFI, DFI, and performance race engines across outboard and SportJet platforms.
In the 2.0L family, it fits the 135 HP, 140 Jet, 150 HP, V-150 EFI, and international models like the V-140. For 2.4L engines, it supports the 150 HP XR2, 175 HP, V-175, and V-200, including Magnum III, Magnum EFI, and Pro Max builds.
In the 2.5L class, it applies to the 150 HP, 175 HP, 200 HP, 225 EFI, and 225 EFI Pro Max. It also fits specialty models like the V-150 Pro Max, 200 HP XS, 200 HP XS ROS, SST-120, and S3000 F1 race engines.
The stud kit is also compatible with Mercury Jet Drive and SportJet configurations, including 175XR2, 200 DFI Jet, 210 Carb M2 Jet, 240 EFI Jet Drive, and M2 Jet Powerheads.
Engineering Features and Service Benefits
Replacing the original screw with a chromoly stud significantly improves clamping integrity. The ARP stud resists thread wear and galling, especially in aluminum throttle arm castings. Its internal Allen drive simplifies removal and installation during throttle linkage service.
The stainless washer ensures even load distribution at the throttle arm, while the stainless nylock nut maintains secure torque under vibration. This setup is ideal for high-RPM applications, offering increased reliability with repeated use.
Corrosion Protection for ARP Chromoly Studs
To protect the black oxide finish and preserve thread quality, clean the stud before installation and apply a thin coat of engine oil or a corrosion-inhibiting spray like WD-40. Reapply lubricant regularly if used in humid or saltwater environments. For storage, keep the stud dry and away from direct moisture exposure to prevent oxidation.
The Buckshot Racing 77 ARP Throttle Arm Stud Kit offers a durable, high-performance upgrade for all Mercury 2.0L, 2.4L, and 2.5L V6 2-stroke outboards. From recreational engines to competitive models like the SST-120, S3000, and 2.5L drag builds, it ensures consistent throttle control and long-term serviceability in any performance environment.
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support