Shim Kit, Reverse – Fits Yamaha Outboards (Replaces 61A-45577-00-00, 61A-45577-60-00)
Shim Kit, Reverse – Fits Yamaha Outboards (Replaces 61A-45577-00-00, 61A-45577-60-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Shim Kit, Reverse – Fits Yamaha Outboards (Replaces 61A-45577-00-00...
Product Details
This Shim Kit, Reverse – Fits Yamaha Outboards is used for adjusting the mechanical clearance in the reverse gear assembly on compatible Yamaha outboard motors. Proper shimming is critical for smooth gear engagement, reducing noise, and preventing premature wear on gearbox components.
This kit provides a direct interchange for Yamaha OEM part numbers 61A-45577-00-00 and 61A-45577-60-00, as well as the aftermarket equivalent SEI Marine Products 602-98-421-06K.
- Installs within the lower unit's reverse gear mechanism.
- Kit contains assorted shims to achieve precise factory-specified clearances.
- Engineered to meet or exceed original equipment specifications for fit and function.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 61A-45577-00-00 | Original Equipment |
| Yamaha | 61A-45577-60-00 | Superseded Part |
| SEI Marine Products | 602-98-421-06K | Aftermarket Cross-Reference |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Compatibility information for specific Yamaha outboard models is limited. This part is primarily identified by its OEM number. Please verify the part number required for your specific engine model by consulting your service manual.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 61A-45577-00-00 |
Technical Specs
- Product Type
- Reverse Gear Shim Kit
- Thickness
- 0.10mm (T:0.10mm)
- Product Dimensions
- 11.5" L x 11.0" W x 0.3" H
- OEM Compatibility
- Yamaha Outboards
- Installation Location
- Reverse gear mechanism
What’s in the Box
- Shim kit containing multiple shims of various thicknesses for reverse gear adjustment (replaces 61A-45577-00-00, 61A-45577-60-00).
Installation Notes
- Always consult your engine's official service manual before beginning any repair.
- Safely secure the outboard motor and disconnect the battery.
- Drain the gearcase oil and disassemble the lower unit to access the propeller shaft and reverse gear assembly.
- Carefully remove the existing reverse gear and shims, noting their order and orientation.
- Using a dial indicator and the procedure outlined in your service manual, measure the gear backlash or clearance.
- Select the correct shim or combination of shims from the kit to bring the clearance into the manufacturer's specified range.
- Install the new shims and reassemble the gearcase components.
- Torque all fasteners to the specified values.
- Refill the gearcase with fresh lubricant to the correct level.
- Test the shifting operation on the water to confirm smooth engagement in forward, neutral, and reverse.
Troubleshooting & FAQ
How do I determine the correct shim thickness to use?
The required thickness is determined by a measurement procedure outlined in your Yamaha service manual. It typically involves using a dial indicator to measure gear backlash and selecting shims that bring this measurement within the specified tolerance. Do not guess; an incorrect shim can cause damage.
What are the symptoms of incorrect reverse gear shimming?
Signs include difficulty shifting into or out of reverse, grinding noises during shifting or operation, excessive gear "clunk," or premature wear on the reverse gear and clutch dog.
Is this shim kit also used for the forward gear?
No, this particular kit is specified for the reverse gear. Forward gear adjustment uses a different set of shims and procedures. Refer to your service manual for the correct forward gear shim part numbers.
Can I stack multiple shims together?
Yes, it is standard practice to stack multiple shims if necessary to achieve the precise required thickness for proper gear clearance. Ensure they are clean and lie flat when installed.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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