Transom Saver Wedge Support – Fits Yamaha, Mercury, Honda, Johnson/Evinrude & Suzuki Outboards
This wedge-style transom saver provides essential support for outboard engines equipped with 2 or 3-ram power trim/tilt systems. By stabilizing the engine and steering mechanism during trailering, it effectively reduces stress on the transom assembly, motor mounts, and hydraulic system, preventing costly damage and wear.
This part is a direct replacement for GHmarine 1H03, Yamaha MAR-MTSPT-YM-08, and M-Y Wedge Universal Motor Support, offering a reliable fit for a wide range of outboard models including Yamaha (115–350 HP), Mercury (135–300 HP), Honda (90–300 HP), Johnson/Evinrude (150–300 HP), and Suzuki (140-350 HP).
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Installation Method: Simply slides over the trim/tilt piston rod for a secure fit.
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Durable Construction: Made from high-quality EPDM rubber and reinforced plastic to resist UV and saltwater damage.
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Complete Kit: Includes two outboard steering stabilizer clips to prevent engine turning during trailering.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand |
Part Number |
| GHmarine |
1H03 |
| Yamaha |
MAR-MTSPT-YM-08 |
| M-Y Wedge |
Universal Motor Support |
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.
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.
For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.
For Suzuki owners, You can review exploded diagrams here to verify part numbers: Suzuki Parts Diagrams & Catalog.
Confirm your engine model/year in the table below.
| Brand |
Model |
Rated HP |
Stroke |
OEM Part No. |
Notes |
| Yamaha |
Outboards including SHO |
115-350 |
2 & 4-Stroke |
MAR-MTSPT-YM-08 |
For 2/3-Ram Trim/Tilt Systems |
| Yamaha |
F300-F350 |
300-350 |
4-Stroke |
MAR-MTSPT-YM-08 |
V-8 models need 2 units (port and starboard) |
| Brand |
Model |
Rated HP |
Stroke |
Notes |
| Mercury |
Outboards |
135-300 |
2 & 4-Stroke |
For 2/3-Ram Trim/Tilt Systems |
| Mercury |
Carb, EFI, OptiMax, HPDI |
135-300 |
2 & 4-Stroke |
Install on starboard side typically |
| Brand |
Model |
Rated HP |
Stroke |
Notes |
| Honda |
All compatible outboards |
90-300 |
4-Stroke |
For 2/3-Ram Trim/Tilt Systems |
| Honda |
BF90-BF300 |
90-300 |
4-Stroke |
Install on starboard side typically |
| Brand |
Model |
Rated HP |
Stroke |
Notes |
| Johnson/Evinrude |
All compatible models |
150-300 |
2 & 4-Stroke |
Except Generation 2 models |
| Johnson/Evinrude |
Carb, EFI, OptiMax, ETEC, Ficht |
150-300 |
2 & 4-Stroke |
Install on starboard side typically |
| Brand |
Model |
Rated HP |
Stroke |
Notes |
| Suzuki |
DF140-DF350 |
140-350 |
4-Stroke |
For trim/tilt systems |
| Suzuki |
Four-stroke outboards |
140-350 |
4-Stroke |
Trim limiter may need adjustment for some models |
Technical Specifications
| Specification |
Value |
| Product Type |
Transom Saver / Motor Support |
| Installation |
Slides over trim/tilt piston rod |
| Connection |
Direct fit on trim/tilt piston |
| Housing Material |
EPDM Rubber and Reinforced Plastic |
| Housing Color |
Black |
| Dimensions |
8.75 × 2 × 2 inches (222.3 × 50.8 × 50.8 mm) |
| Weight |
0.77 kg (1.7 lbs) |
| Fittimg Type |
Wedge design, self-centering |
| Operating Temperature |
UV and saltwater resistant |
| Other Technical Attributes |
Includes steering stabilizer clips to prevent engine turning while trailering |
Package Contents
- 1 x Wedge Transom Saver Support (GHmarine 1H03)
- 2 x Outboard Steer Stop Stabilizer Clips
Installation Guide
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Raise the Outboard: Tilt your outboard motor to the full "up" position using the power trim/tilt switch.
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Position the Wedge: Slide the Transom Saver Wedge over the exposed piston rod on one of your main trim rams. For most engines, the starboard (right) side ram is used.
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Lower the Outboard: Carefully lower the engine until it makes firm contact with the wedge, creating pressure that holds it in place. Do not apply excessive pressure.
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Attach Stabilizer Clips: Clip the included steering stabilizers onto the hydraulic steering cylinder rods on both sides of the motor. This prevents the engine from turning left or right during transit.
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Final Check: Before trailering, ensure the engine is securely resting on the wedge and the steering is locked straight.
Troubleshooting & FAQ
Q: How do I confirm this fits my engine?
A: This wedge fits most Yamaha, Mercury, Honda, Johnson/Evinrude, and Suzuki outboards within the specified HP ranges and equipped with a 2 or 3-ram power trim/tilt system. Please check the compatibility tables above. Note that Johnson/Evinrude Generation 2 models are not compatible, and V-8 Yamaha models require two wedges.
Q: What are the 'stabilizer clips' for?
A: The two included clips attach to your hydraulic steering rods. Their purpose is to lock the steering and prevent the engine from turning side-to-side while you are trailering, providing an extra layer of security.
Q: Why should I use a transom saver?
A: During trailering, road bumps and vibrations can put significant stress on your boat's transom, the motor mounts, and the outboard's hydraulic trim system. This wedge stabilizes the motor's weight, absorbing shock and preventing wear or damage to these critical components.
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?
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Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
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Fast Global Shipping: Free delivery worldwide in 5–15 days.
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Direct from Manufacturer: Competitive pricing without compromising quality.