Mercury
Long Shaft Extension Kits
Bay has expanded its line of kits to convert Mercury outboards to long or extra long shaft. Even though they cost a fraction of factory parts alone to convert standard motors to long shaft, Bay extension kits are designed and manufactured of top quality materials to give lasting reliability to your outboard motor.
Using compatible alloys in both the housings, shafts, and studs, these kits are as corrosion resistant as the motor itself. All shaft and studs are of stainless steel and housings are cast of the same type of alloy as used in the motors.
Dealer pricing is available pending proper qualifications.
New Model!
Kit #301 – Mercury 8hp, 9.9hp 4 stroke
| Model | Serial Number | Bay Kit # | Length |
|---|---|---|---|
| 6, 8, 9.9, 15 2 stroke | A197112 and up | 108 | 5 inches |
| 6, 8, 9.9, 15 2 stroke | D281000 and up | 108 | 5 inches |
| 6, 8, 9.9, 15 2 stroke | 1B015065 and up | 108 | 5 inches |
| 9.9, 15 4 stroke | OG590000 and up | 109 | 5 inches |
| 9.9, 15 4 stroke | 0T895575 and up | 109 | 5 inches |
| 9.9, 15 4 stroke | 1B015065 and up | 109 | 5 inches |
| 8hp & 9.9 4 stroke NEW MODEL | OR Serial Numbers/ Standard Gear Case | 301 | 5 inches |
| 9.9hp & 15hp Bigfoot, Pro Kicker, & Command Thrust | OR Serial Numbers | 302/302A (depends on drive shaft style) | 5 inches |
| 15hp & 20hp 4 stroke NEW MODEL | OR Serial Numbers | 302 | 5 inches |
| 2018 NEW MODEL 9.9hp, 15hp & 20hp EFI & Prokicker 4 stroke | OR Serial Numbers - SPACER COMES PAINTED | 304 11 spline drive shaft 304A 10 spline drive shaf | 5 inches |
| 18 & 25 | 5705532 and up | 225 | 5 inches |
| 18 & 25 | 6416713 and up | 226 | 5 inches |
| 20 & 25 | 6443973 and up | 226 | 5 inches |
| 20 & 25 | G044027 and up | 226A | 5 inches |
| 20 & 25 | B238464 and up | 226 | 5 inches |
| 25 2 stroke | 1B207251 and up | 226A | 5 inches |
| 30 2 cyl. | G053314 and up | 227 | 5 inches |
| 25 & 30 4 stroke | OG760300 and up | 228 | 5 inches |
| 25 & 30 4 stroke | OR Serial Numbers | 303 Shift Shaft has 2 Hole Drill Pin Coupler 303A Shift Shaft has a 1 Hole Drill Pin Coupler | 5 inches |
| New 2023 25 & 30hp 4 Stroke Models | Serial Numbers 1R154 & Higher | Kit #305 | 5 inches |
| 25 Big Foot 4 stroke | 0T425933 and up | 228 | 5 inches |
| 25 Big Foot 4 stroke | 1B184725 and up | 228 | 5 inches |
| 40 2 cyl. | G053314 and up | 227 | 5 inches |
| 30, 40 4 stroke | OG760300 and up | 228 | 5 inches |
| 30, 40 2 stroke | OG760300 and up | 227 | 5 inches |
| 30, 40 2 stroke | 0T782393 and up | 227 | 5 inches |
| 30, 40 2 stroke | 1B180081 and up | 227 | 5 inches |
| 30-40 3 cyl. | BIG FOOT | 414 | 4 inches |
| 60 3 cyl. 2 stroke | D000750 and up | 411 | 5 inches |
| 60 3 cyl. 2 stroke | 0T455053 and up | 411 | 5 inches |
| 40, 45, 55, 60 3 cyl | 411 | 5 inches | |
| 50 3 cyl 2 stroke | 227 | 5 inches | |
| 50 3 cyl. 2 stroke | 0T501925 and up | 227 | 5 inches |
| 50 3 cyl. 2 stroke | 1B195987 and up | 227 | 5 inches |
| 50 3 cyl 4 stroke | OG760300 and up | 228 | 5 inches |
| 50 4 stroke | BIG FOOT OG and up | 415 | 5 inches |
| 40-50-60 4cyl 4 stroke | OT and up | 415 | 5 inches |
| 50 4 cyl. 4 stroke | 1B020914 and up | 415 | 5 inches |
| 60 4 stroke & Command Thrust Models | 1B144686 and up | 415/415A | 5 inches |
| 70 3 cyl. | A996142 and up | 410 | 5 inches |
| 75 2 stroke | D283222 and up | 414 | 5 inches |
| 75 | B240451 and up | 414 | 5 inches |
| 75 4 stroke 1.7 Liter | Driveshaft not available for some models. | 414S | 5 inches |
| 75hp 4 stroke 2.1 Liter NEW MODELS | 2B095049 and up - SPACER COMES PAINTED | 615A | 5 inches |
| 75 Optimax | 1B027808 and up | 414 | 5 inches |
| 80 3 cyl. | A996142 and up | 410 | 5 inches |
| 90 3 cyl. | A996142 and up | 410 | 5 inches |
| 90 3 cyl. 2 stroke | D283222 and up | 414 | 5 inches |
| 90 4 stroke 1.7 Liter | Driveshaft not available for some models. | 414S | 5 inches |
| 90hp 4 stroke 2.1 Liter NEW MODELS | 2B095049 and up - SPACER COMES PAINTED | 615A | 5 inches |
| 90 Optimax | 1B027808 and up | 414 | 5 inches |
| 100 4 cyl. | B209468 and up | 410 | 5 inches |
| 100 4 cyl. | D283222 and up | 414 | 5 inches |
| 100 4 stroke | Driveshaft not available for some models. | 414S | 5 inches |
| 115 (Does not fit inline 6 models) | B209468 and up | 410 | 5 inches |
| 115 4 stroke 1.7 Liter | Driveshaft not available for some models. | 414S | 5 inches |
| 115hp 4 stroke 2.1 Liter NEW MODELS | 2B095049 and up - SPACER COMES PAINTED | 615A | 5 inches |
| 115 4 cyl. | D283222 and up | 414 | 5 inches |
| 115 Optimax | 1B027808 and up | 414 | 5 inches |
| 125 4 cyl. | D283222 and up | 414 | 5 inches |
| 150 V-6 20" | 4868998 and up | 611 | 5 inches |
| 150 V-6 25" | 6042946 and up | 611A | 5 inches |
| 150 V-6 20" | 6443213 and up | 611 | 5 inches |
| 150 V-6 25" | 6443213 and up | 611A | 5 inches |
| 150 PRO XS 2 Stroke Pro XS Models 2 Stroke | 2.5 liter 3.0 liter | 611 613 | 5 inches |
| 150 & PRO XS 4 Stroke 3.0 LITER | SPACER COMES PAINTED BLACK | 615A 615A 20 INCH TO 25 INCH 615AL 25 INCH TO 30 INCH | 5 inches |
| 135 \ 150 20" | A904646 and up | 611 | 5 inches |
| XR2 \ 135XD 25" | 611A | 5 inches | |
| XR4 Magnum II 20" | B242885 and up | 611 | 5 inches |
| XR4 Magnum 175 25" | 611A | 5 inches | |
| 135 / 150 20" | C100861 and up | 611 | 5 inches |
| 175 / 200 25" | C100861 and up | 611A | 5 inches |
| 135 / 150 20 " | C239553 and up | 611 | 5 inches |
| 135 / 150 XR6 | DO82000 and up | 611 | 5 inches |
| 135 / 150 XR6 | OG303046 and up | 611 | 5 inches |
| 135 20" Optimax | 1B073074 and up | 611 | 5 inches |
| 150 20" Optimax | 1B106925 and up | 611 | 5 inches |
| 175 V-6 20" | 6618751 and up | 611 | 5 inches |
| 175 V-6 25" | 6618751 and up | 611A | 5 inches |
| 175 20" Optimax | 0T908388 and up | 611 | 5 inches |
2018 NEW MODEL | V-6 175hp-225hp V8 200hp-300hp 4.8 in. & 5.4 in & Sport Master - SPACER COMES PAINTED | 616 From 20 inch to 25 inch Models 617 For 25 Inch Models Going to 30 Inch 617S Going 20 inch to 30 inch | 5 inches 10 inches |
| 200 V-6 20" | 536918 and up | 611 | 5 inches |
| 200 V-6 25" | 5363918 and up | 611A | 5 inches |
| 200 / 200 XR1 V-6 | C100861 and up | 611 | 5 inches |
| 175 / 200 XR6 | OG303046 and up | 611 | 5 inches |
| 200 Optimax | 0T667124 and up - SPACER COMES PAINTED | 613 | 5 inches |
2018 NEW MODEL | V-6 175hp-225hp V8 200hp-300hp 4.8 in. & 5.4 in & Sport Master - SPACER COMES PAINTED | 616 From 20 inch to 25 inch Models 617 For 25 Inch Models Going to 30 Inch 617S Going 20 inch to 30 inch | 5 inches 10 inches |
| 220 & 225 V-6 | 5628028 and up | 611 | 5 inches |
| 225 & 250 1994-98 | By serial number | 611 | 5 inches |
| 3.0L | 1999 and up by serial - SPACER COMES PAINTED | 613 | 5 inches |
| 200, 225, 250 Optimax and DFI & EFI models | 0G283148 and up - SPACER COMES PAINTED | 613 | 5 inches |
| 200 2.5L EFI | 0T235136 and up | 611 | 5 inches |
| 225 EFI models with Yamaha Powerhead | OT and newer on some Mercury models with Yamaha Powerhead | 805 | 5 inches |
| 225 & 250 EFI | 0T944708 and up - SPACER COMES PAINTED | 613 | 5 inches |
2018 NEW MODEL | V-6 175hp-225hp V8 200hp-300hp 4.8 in. & 5.4 in & Sport Master - SPACER COMES PAINTED | 616 From 20 inch to 25 inch Models 617 For 25 Inch Models Going to 30 Inch 617S Going 20 inch to 30 inch | 5 inches 10 inches |
| Verado 135, 150, 175, 200, 225, 250, 275, 300, 350 | No driveshaft available | 614S | 5 inches |
| 300 hp | OG981393 and up - SPACER COMES PAINTED | 613 | 5 inches |
