Power Trim/Tilt Cylinder End Cap with Seals – Fits Yamaha Outboard 60-90 HP

Power Trim/Tilt Cylinder End Cap with Seals – Fits Yamaha Outboard 60-90 HP (Replaces 6H1-43821-11-00, 6H1-43821-10-00)

This power trim/tilt cylinder end cap assembly is designed for a precise fit on a range of Yamaha outboard motors from 60 to 90 HP, including various 2-stroke and 4-stroke models in the 60TLR, 70TLR, and 90TLR series manufactured between 2000 and 2004.

Engineered as a direct replacement for Yamaha OEM parts, this component ensures seamless integration with your existing hydraulic trim/tilt system. It directly replaces Yamaha part numbers 6H1-43821-11-00, 6H1-43821-11, 6H1-43821-10-00, and 6H1-43821-10.

• Installation Type: Screw-in cylinder end cap assembly.
• Construction: Made from aircraft-grade aluminum with a Military Grade Type 3 hard anodized coating for superior corrosion resistance and durability.
• Kit Contents: Includes the cylinder end cap and all necessary seals for a complete installation.

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 Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Power Trim/Tilt Cylinder End Cap Assembly (6H1-43821-11-00/6H1-43821-10-00)
• Multiple seals included for a complete rebuild.

Installation Guide

1. Tilt the outboard motor up and engage the tilt lock lever for safety.
2. Place a drain pan under the trim/tilt unit to catch hydraulic fluid.
3. Carefully relieve any hydraulic pressure in the system according to your service manual.
4. Using an appropriate spanner wrench, unscrew and remove the old cylinder end cap. Be prepared for some fluid leakage.
5. Gently remove the old seals from the cylinder housing and piston rod.
6. Clean the cylinder bore and rod, ensuring there is no debris or corrosion.
7. Lubricate the new seals with fresh hydraulic fluid and carefully install them in their respective grooves on the new end cap and piston.
8. Install the new end cap, ensuring the piston is correctly aligned.
9. Screw the new end cap into the cylinder and torque it to the manufacturer's specified value.
10. Refill the trim/tilt reservoir with the recommended hydraulic fluid and bleed the system of any air by cycling the unit up and down several times.
11. Check for any leaks around the new end cap and verify smooth operation.

Troubleshooting & FAQ

Q: How do I confirm this end cap will fit my specific Yamaha engine?
A: The best way to ensure compatibility is to match your existing part number to the ones listed in our cross-reference table: 6H1-43821-11-00, 6H1-43821-11, 6H1-43821-10-00, or 6H1-43821-10. You should also check your engine's model and year against our compatible models list.

Q: What are the signs that my original cylinder end cap is failing?
A: Common signs of a failing end cap include visible hydraulic fluid leaks around the cylinder, a "spongy" or jerky trim/tilt operation, or the motor failing to hold its trimmed position and slowly drifting down. Corrosion or visible damage to the cap are also indicators.

Q: What is the benefit of the aircraft-grade aluminum and anodized coating?
A: This construction provides superior strength and durability compared to standard materials. The Military Grade Type 3 hard anodized coating offers exceptional resistance to corrosion from saltwater and environmental exposure, significantly extending the part's service life.

Q: OEM vs. Aftermarket?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.