Uflex Hydraulic Steering Cylinders for Outboards - Application Guide
UC81-OBF
Single engine up to 115 HP and where the boat speed does not exceed 45 mph (40 knots). Not intended for use in racing applications. This steering cylinder is balanced: the number of turns lock-to-lock is equal port to starboard and vice-versa. Depending on the applications on the outboard engine, the UC81-OBF can be installed port or starboard.
| Engine | Power | Year |
| Mercury Mariner |
50 – 75 – 90 2T 115 EFI 2T 75 – 90 – 115 Optimax 2T 40 – 50 – 60 EFI 4T 75 – 80 – 90 EFI 4T 100 – 115 EFI 4T |
1990-2008 1990-2007 2004-up 2004-up 2000-up 2007-up |
| Evinrude | E40-E50-E55-E60 2T E75-E90 2T E115 2T V4 |
2004-up 2004-up 1995-up |
| Yamaha | 60-70 2T 75C-90 2T 115C 2T F40G-F70 4T F30-F40-F60-F75-F80 EFI 4T F70 4S F90-F100-F115 EFI 4T F80-F100 4T F115 F40D-F50F-F60C EFI 4T |
1984-2008 1984-2008 1998-2008 1990-2008 2010-up 1999-2007 2010-up 1999-2007 2000-up 2004-up |
| Honda | BF40-50-60-75-90 4T BF115D BF115A BF90 V-TEC 4T |
1995-up 1998-2009 2009-up 2008-up |
| Suzuki (*NOTE: Suzuki engines built from 1998 to 2008 installing UC81-OBF cylinder require optional KIT SU) |
DF40-50-60-70-80-90 4T DF100-115 4T* DF100-115 4T new model |
1998-up 1998-2008 2008-up |
| Tohatsu Nissan |
40-50-60-70-90 2T 75-115 2T 40-50TLDI 4T 70-90-115 TLDI 4T |
2004-up 2004-up 2004-up 2004-up |
| Selva | 40XS-50 Madeira 2T 40XS-50 Bull shark 2T 40XS-60 Grey shark 2T 40XS-70 Mako Shark 2T 40XS-60 St.Tropez 2T 80 Portofino/Tigershark 2T 25 Kingfish 4T 40 Aruana 4T 40XS-40XSR-50-60 Dorado EFI 4T 40XSR EFI Murena 4T 80XS-100-100XSR EFI Marlin 4T 115-115XSR EFI Tarpon 4T 115 EFI Narwhal 4T |
1995-up 1995-up 1995-up 1995-up 1995-up 1995-up 1995-up 1995-up 1995-up 1995-up 1995-up 2000-up 2000-up |
| Johnson | BJ60-70 4T BJ90-115 4T J90-115 V4 2T |
2001-2007 2001-2007 1995-2007 |
WARNING These recommendations should be used as a general reference only. For any further information please contact us.
UC95-OBF/1
UC95-OBF/2
UC95-OBF/3
The UC95-OBF front mount cylinders are recommended for use with outboard engines 175 HP total and less and where the boat speed does not exceed 55 mph (48
knots). Not intended for use in racing applications. This steering cylinder is balanced: the number of turns lock-to-lock is equal port to starboard and vice-versa.
| Engine | Power | Year | Cylinder |
| Mercury Mariner |
80-75-90 2 Stroke 50-75-90 2 Stroke 75-90-115 Optimax 2 Stroke 125- 135-150 -175 Optimax 2 Stroke 100-115-150 EFI 2 Stroke 40-50-60 EFI 4 Stroke 75-80-90 EFI 4 Stroke 100-115-EFI 4 Stroke 175-V6 4 Stroke |
1990-2008 1990-2008 2004-up 1999-up 1999-up 2004-up 2000-up 2007-up 2018-up |
UC95-OBF/1 UC95-OBF/1 UC95-OBF/3 UC95-OBF/1 UC95-OBF/1 UC95-OBF/1 UC95-OBF/1 UC95-OBF/1 UC95-OBF/1 |
| Evinrude | E40-E50-E55-E60 2 Stroke E75-E90 2 Stroke E115-E130 -E135 2 Stroke V4 E130-E135 2 Stroke V4 E150 -175 2 Stroke V6 |
2004-up 2004-up 1995-up 1995-up 1995-up |
UC95-OBF/1* UC95-OBF/1* UC95-OBF/1* UC95-OBF/1* UC95-OBF/1* |
| Yamaha | 60-70 2 Stroke 75C-90 2 Stroke 115C-130B -150F 2 Stroke 150-175 HPDI VMAX 2 Stroke F60-F75-F80 EFI 4 Stroke F90-F100-F115 F150 EFI 4 Stroke F115-F150-F175 L4 4 Stroke |
1984-2008 1998-2008 1990-2008 2000-2008 1999-2007 1999-2007 2004-up |
UC95-OBF/1 UC95-OBF/1* UC95-OBF/1* UC95-OBF/1* UC95-OBF/1 UC95-OBF/1 UC95-OBF/1 |
| Honda | BF75-90 4 Stroke BF80-100 BF115D BF115A BF130A BF135-150 4 Stroke BF175-4 Stroke |
1995-up 2013-up 1998-2009 2009-up 1998-2005 2005-up 2001-up |
UC95-OBF/1 UC95-OBF/1 UC95-OBF/3 UC95-OBF/1 UC95-OBF/3 UC95-OBF/1 UC95-OBF/1 |
| Suzuki | DF70-80-90 4 Stroke DF100-115 -140 4 Stroke DF150-175 4 Stroke |
1998-up 1998-up 2006-up |
UC95-OBF/1* UC95-OBF/1 UC95-OBF/1 |
| Tohatsu Nissan |
115-120-140 2 Stroke 70-90-115 TLDI 4 Stroke BFT60-75-90 4 Stroke BFT80-100-115-150 4 Stroke 70-90-115 TLDI 4 Stroke 70-90-100-115 MFS 4 Stroke |
2004-up 2004-up 2015-up 2015-up 2004-up 2020-up |
UC95-OBF/1* UC95-OBF/1 UC95-OBF/1 UC95-OBF/1 UC95-OBF/1 UC95-OBF/1 |
| Selva | 80 Portofino/Tigershark 2 Stroke 150 WHITE SHARK 2 Stroke 100EFI Marlin - 115 EFI Narwhal 150EFI Killer Whale 4 Stroke |
1995-up 2001-2007 2001-2007 2000-up |
UC95-OBF/1 UC95-OBF/1* UC95-OBF/1 UC95-OBF/1 |
| Johnson | BJ90-115-140 4 Stroke BJ70 4 Stroke J90-115 V4 2 Stroke J150 -175 V6 2 Stroke |
2001-2007 2001-2007 1995-2007 1995-2007 |
UC95-OBF/1 UC95-OBF/1* UC95-OBF/1* UC95-OBF/1* |
*NOTE: The UC95-OBF/2 cylinder allows for a wider tilting angle.
WARNING These recommendations should be used as a general reference only. For any further information please contact us.
UC128-OBF/1
UC128-OBF/2
UC128-OBF/3
The UC128-OBF front mount cylinders are not recommended for use in installations where the boat speed exceeds 55 mph (48 knots) (65 mph (56 knots) in dual engine, dual cylinder and
counter rotating engines applications). Not intended for use in racing applications. This steering cylinder is balanced: the number of turns lock-to-lock is equal port to starboard and vice-versa.
| System | Application | Wheel Turns | Components | Model | Qty |
| Single engine / Single cylinder | Up to 300 hp max |
4.8 4.3 |
Cylinder Helm pump Hose Kit Oil Steering wheel |
UC128-OBF UP25 or UP28 KIT OB OIL 15 (Wheel selection) |
1 1 1 2 1 |
| For a second station add: (1) UP25 or UP28 helm pump, (1) KIT OB-2S fitting kit, (1) KIT OB, (1) OIL 15, (1) steering wheel | |||||
| Dual engine / Single cylinder |
Up to 300 hp max Up to 500 hp max |
4.8 4.3 |
Cylinder Helm pump Hose Kit Oil Tie bar Steering wheel |
UC128-OBF UP25 or UP28 KIT OB OIL 15 A96 (Wheel selection) |
1 1 1 2 1 1 |
| For a second station add: (1) UP25 or UP28 helm pump, (1) KIT OB-2S fitting kit, (1) KIT OB, (1) OIL 15, (1) steering wheel | |||||
| Dual engine / Dual cylinder |
Up to 500 hp max Up to 600 hp max |
6.1 5.3 |
Cylinder Cylinder Port Helm pump Hose Kit Oil Tie bar Steering wheel Connection Kit |
UC128-OBF UC128P-OBF UP39 or UP45 KIT OB OIL 15 A95 (Wheel selection) KIT OB-DBR |
1 1 1 1 3 1 1 1 |
| For a second station add: (1) UP39 or UP45 helm pump, (1) KIT OB-2S fitting kit, (1) KIT OB, (2) T fittings 39502 V, (1) OIL 15, (1) steering wheel | |||||
| Engine | Power | Year | Cylinder | Packaged |
| Mercury Mariner |
115-125-150 EFI 2 Stroke 225-250 EFI 2 Stroke 75-90-115 OPTIMAX 135-150-175 OPTIMAX 200-225-250 OPTIMAX RACING 300 OPTIMAX 100-115 EFI 4T 250 SALTWATER EFI 4 Stroke 135-150-175-200 VERADO L4 FOURSTROKE 175-200 V6 FOURSTROKE 225-300 V8 |
1990-2007 2000-2007 2004-to date 1999-to date 1999-to date 1999-2011 2007-to date 2007-2011 2004-to date 2018-to date 2018-to date |
UC128OBF-1 UC128OBF-1 UC128OBF-3 UC128OBF-1 UC128OBF-1 UC128OBF-1 UC128OBF-1 UC128OBF-1 UC128OBF-1 UC128OBF-1 UC128OBF-1 |
PROTECH 1 PROTECH 1 PROTECH 3 PROTECH 1 PROTECH 1 PROTECH 1 PROTECH 1 PROTECH 1 PROTECH 1 PROTECH 1 PROTECH 1 |
| Evinrude | E75-E90 2 Stroke E115-E130-E135 2 StrokeV4 E150-E175-E200-E225-E250-E300 2 Stroke V6 |
2004-to date 1995-to date 1995-to date |
UC128OBF-2 UC128OBF-2 UC128OBF-2 |
PROTECH 2 PROTECH 2 PROTECH 2 |
| Yamaha | 115C-130B 2 Stroke 75C-90 2 Stroke 115C-130B 2 Stroke 150F-200F-250G 2 Stroke 150 HPDI VMAX 2 Stroke 175-200-225-250-300 HPDI VMAX 2 Stroke F115-F150 EFI 4 Stroke F200-F225-F250 4 Stroke F70 4 Stroke F115-F150-F175-F200 L4 4 Stroke F200-F225-F250-F300 V6 4 Stroke |
1990-2008 1998-2008 1990-2008 1996-2007 2000-2008 2000-2008 1999-2007 2002-2007 2010-to date 2004-to date 2004-to date |
UC128OBF-2 UC128OBF-2 UC128OBF-2 UC128OBF-2 UC128OBF-2 UC128OBF-2 UC128OBF-1 UC128OBF-2 UC128OBF-1P UC128OBF-1 UC128OBF-2 |
PROTECH 2 PROTECH 2 PROTECH 2 PROTECH 2 PROTECH 2 PROTECH 2 PROTECH 1 PROTECH 2 PROTECH 1 PROTECH 1 PROTECH 2 |
| Honda | BF75-BF90 4 Stroke BF115-BF130 4 Stroke BF135-BF150 4 Stroke BF150 V-TEC 4 Stroke BF175-BF200-BF225- BF250 4 Stroke |
1995-to date 1998-to date 2005-to date 2008-to date 2001-to date |
UC128OBF-1 UC128OBF-3 UC128OBF-1 UC128OBF-1 UC128OBF-1 |
PROTECH 1 PROTECH 3 PROTECH 1 PROTECH 1 PROTECH 1 |
| Suzuki | DF70-80-90 4T DF100-115-140 4 Stroke DF100-115-140 4 Stroke DF150-175-DF200 L4 4 Stroke DF200-DF225-DF250-DF300-V6 4 Stroke |
1998-to date 1998-2008 1998-to date 2006-to date 2004-to date |
UC128OBF-2 UC128OBF-1* UC128OBF-1 UC128OBF-1 UC128OBF-2 |
PROTECH 2 PROTECH 1 PROTECH 1 PROTECH 1 PROTECH 2 |
| Tohatsu Nissan |
115-120-140 2 Stroke 70-90-115 TLDI 4 Stroke BFT60-75-90 4 Stroke BFT80-100-115 4 Stroke BFT150-200-225-250 4 Stroke |
2004-to date 2004-to date 2015-to date 2015-to date 2015-to date |
UC128OBF-2 UC128OBF-1 UC128OBF-1 UC128OBF-3 UC128OBF-1 |
PROTECH 2 PROTECH 1 PROTECH 1 PROTECH 3 PROTECH 1 |
| Selva | 80 PORTOFINO/TIGERSHARK 2 Stroke 150 WHITE SHARK 2 Stroke 100EFI MARLIN -115 EFI NARWHAL150EFI KILLER WHALE 4 Stroke |
1995-2008 2001-2007 2000-to date |
UC128OBF-1 UC128OBF-2 UC128OBF-1 |
PROTECH 1 PROTECH 2 PROTECH 1 |
| Johnson | BJ90-115-140 4 Stroke J90-115 V4 2 Stroke J150-175 V6 2 Stroke J200-225 V6 4 Stroke |
2001-2007 1995-2007 1995-2007 2004-2007 |
UC128OBF-1 UC128OBF-2 UC128OBF-2 UC128OBF-2 |
PROTECH 1 PROTECH 2 PROTECH 2 PROTECH 2 |
For higher horsepower applications, high performance SilverSteer™ cylinder is recommended.
WARNING These recommendations should be used as a general reference only. For any further information please contact us.
WARNING These steering systems can only be used when the engine is in compliance with the approved U.S. Coast Guard vessel horsepower rating. When installing UC128-OBF cylinder in conjunction with an ENGINE JACK PLATE trim system, a manual clearence check must be made in all moveable positions. Failure to comply with the installation manual for engine application, cylinder/hose clearence, and approved hydraulic fluids, may result in loss of steering, causing serious property damage and / or personal injury.
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