Extend the performance and adaptability of your Mercury 2-stroke outboard with this precision-engineered 5" Extension Kit from Bay Manufacturing. Designed to increase shaft length by a true 5 inches, this kit provides improved propeller bite, better handling in rough water, and enhanced overall stability.
Each Bay Manufacturing extension kit includes stainless-steel shafts and studs for long-term corrosion resistance, while the spacer housing is cast from the same alloy used in OEM production for unmatched durability. Some kits may ship unpainted with a sandblasted finish, while newer versions may arrive factory-painted black.
Product Features
- Adds 5 inches of extension to your Mercury outboard
- Designed for 40–60 HP 2-Stroke 3-Cylinder models
- OEM-grade stainless steel shafts and hardware
- Heavy-duty alloy spacer housing
- Direct bolt-on installation
- 1-year Bay Manufacturing warranty
- Includes complete hardware kit for conversion
Compatibility Requirements
Your motor MUST match ALL specs below for proper fitment.
Supported Models
| Horsepower | Stroke | Cylinders | Serial Range |
|---|---|---|---|
| 45 HP | 2-Stroke | — | — |
| 55 HP | 2-Stroke | — | — |
| 60 HP | 2-Stroke | 3-Cylinder | D000750 & Up |
| 60 HP | 2-Stroke | 3-Cylinder | 0T455053 & Up |
Additional Notes
- Fits only 3-cylinder 2-stroke Mercury 40–60 HP models with the listed serial numbers.
- Must verify serial number AND engine configuration before purchasing.
Parts Included
- (1) 5″ Extension Housing
- (1) 5″ Driveshaft
- (1) 5″ Shift Shaft
- (1) 5″ Water Tube
- (5) Studs & Nuts
- (1) Water Sleeve
- (1) Dowel Pin
- (1) Hollow Pin
Additional Information
- Spacer housings may be black-painted or unpainted sandblasted alloy depending on production batch.
- Built for long-lasting performance using marine-grade materials.
- Not returnable except for warranty issues.
Shipping Information
Additional shipping fees to Alaska, Hawaii, U.S. Territories, or international destinations will be calculated after checkout.
A PayPal request will be emailed for any additional charges.
(Some items may be excluded from international shipping.)
Customer Support
For questions or to confirm compatibility, please email customerservice@marinepartswarehouse.com
Please include your engine model or serial number to help confirm proper fitment before ordering.
