Throttle Control Isolator with Clamp – Fits Mercury Outboard Verado 4-Stroke 200-400 HP

Throttle Control Isolator with Clamp – Fits Mercury Outboard Verado 4-Stroke 200-400 HP

This throttle control isolator is designed for Mercury Marine 200-400 HP 4-Stroke Verado outboard motors (L6 6-cylinder engines) manufactured between 2005 and 2014. It connects the throttle body to the air intake, reducing vibrations for smoother performance.

This component is a direct replacement for Mercury part numbers: 87928815T, 8M0113513, 880576005, 880576T04, and 815504256.

• Engineered as a direct replacement for the OEM part for straightforward installation.
• Constructed from high-grade CR rubber and includes a premium SS316 stainless steel clamp for durability.
• Designed specifically to reduce vibrations transferred to the throttle body assembly.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Throttle Control Isolator Boot with SS316 Clamp (Replaces 87928815T, 8M0113513, 880576005, 880576T04, 815504256)

Installation Guide

1. Safety First: Ensure the engine is off and cool. Disconnect the boat's battery before starting work.
2. Locate the Isolator: Identify the existing throttle control isolator connecting the air intake to the throttle body.
3. Remove the Old Part: Loosen the clamp securing the old isolator boot and carefully detach it from both the throttle body and the air intake manifold.
4. Clean Surfaces: Thoroughly clean the connection points on the throttle body and air intake to ensure a proper seal. Remove any old rubber residue or debris.
5. Install the New Isolator: Fit the new rubber isolator boot onto the throttle body and air intake ports.
6. Secure the Clamp: Position the new SS316 clamp over the boot and tighten it securely. Do not overtighten, as this can damage the boot.
7. Final Check: Ensure the connection is firm and there are no gaps. The boot should be fully seated and sealed.
8. Reconnect Power: Reconnect the battery.
9. Test Operation: Start the engine and let it idle. Listen and feel for any air leaks around the new isolator, which could cause a rough idle.

Troubleshooting & FAQ

How do I confirm this fits my engine?
This isolator is specifically for Mercury Verado L6 (6-cylinder) 4-stroke outboards from 200-400 HP, manufactured between 2005 and 2014. The best way to confirm fitment is to match your engine's original part number to the ones listed on our page, including 87928815T and 8M0113513. You can also use the compatibility table provided.

What are the signs that my current isolator needs replacement?
Common signs of a failing throttle isolator include visible cracking, brittleness, or perishing of the rubber boot. Performance issues such as a rough idle, unexplained drops in RPM, or whistling sounds from the engine bay can indicate an air leak caused by a faulty isolator.

What is the function of the throttle control isolator?
Its primary job is to provide a flexible, sealed connection between the air intake and the throttle body. It is also designed to absorb and reduce engine vibrations, preventing them from affecting the sensitive throttle body assembly and sensors.

OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.