Lookup Mercury Marine model 850 85 hp(4 cyl.) outboard motor parts by serial number range and buy discount parts from our large online inventory.
Save up to 70% on stainless & aluminum boat propellers for your 85 HP Mercury Outboard Model 850, 2 & 4-Cyl. Quality props from Michigan Wheel, Solas, Turning Point, Stiletto, Quicksilver. OldMercs.com is your one stop shop for all Mercury parts. We stock parts from 1940 to the present. Manuals: Carburetor: Electrical/Ignition. Merc 850's were.
You Are Viewing Available Prop Pitches For:
Manufacturer: Mercury
Horsepower: 85 HP
Years: Thru 1977
Model: Model 850, 2 & 4-Cyl. Outboard
Specs: Thru Hub Exhaust & 15 Tooth Spline
Max RPM: Not Available
Choose a Propeller Pitch
Important! Choose the correct pitch for your application. Used props are non-returnable.
Read More About Picking Your Pitch
1977 Mercury 850 Manual
Please Choose A Propeller Pitch:
Propeller Pitch
Where to Find Your Prop Pitch
Pitch is stamped on the outer prop hub..
Look on the outer hub of the prop near the blades or inside the hub.
Most props are stamped with a series of numbers.
Pitch is always the last number listed.
Example: 3 x 16 x 24.5R
3 - Number of Blades (occasionally displayed)
16 - Diameter
24.5 - Pitch
R - Direction of Rotation (R = Right/Standard, L = Left/Counter)
Prop Pitch & RPM's
Mercury 850 Carbs
For safety, and efficient performance, it is critical that your engine operates within the RPM range recommended by the manufacturer.
A change in the prop pitch will increase or decrease the engine RPM's and can be used to bring them into the recommended range. A 2' pitch increase (for example, from 21' to 23') will result in approximately a 300-400 RPM decrease and vice versa.
The correct prop allows the engine's RPM to run within the top end of the manufacturers recommendation.
Propeller Help Guide
Propeller Basicss
We tell you everything you need to know about props from cupping to ventilation.
Prop Characteristics
If you want to modify your boat's performance, consider the above before making your selection.
Determining RPM's
For safety and efficient performance, it is critical that your engine operates within the RPM range recommended by the manufacturer.
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1986-1990 Manual Covers: 6/8/9.9/15HP Motors 1986 and up With Serial Numbers OA1972112 and Above.
1995-2000 Manual Covers: Mercury and Mariner 40hp 45hp 50hp Four Stroke (4-Stroke) Non-Big Foot and Bigfoot Engines With Starting Serial Numbers: 0G231123, 1995 & above with Serial Numbers 0G231123 & above. 40HP (4-Stroke) 4 cylinder 1998, 1999 & 2000 Non-Bigfoot, 45 (4-Stroke) 4 cylinder 1998, 1999 & 2000 Non-Bigfoot and Big Foot, 50 (4-Stroke) 4 cylinder 1995, 1996, 1997 & 1998.
1997-2000 Manual Covers: 97-00 Mercury and Mariner 40-50-55-60 HP Two-Stroke Models with serial numbers OG531301 and above.
1997-1998 Manual Covers: 1997-1998 Mercury 200HP ( 200 HP) & 225HP (225 HP) DFI (Direct Fuel Injection) outboard engine. V6 Cylinder, Two Cycle. Models covered are 200 & 225 OPTIMAX DIRECT FUEL INJECTION With Serial Numbers 0G386496 and Above.
1998-1999 Manual Covers: Mercury/Mariner Outboard motors: 98-99 9.9hp (9.9 hp), 15hp (15 hp) Bigfoot and Non-Big Foot 4-Stroke Outboard Engine. Models Covered are 9.9/15 (4-Stroke) (323 cc) & 9.9/15 Bigfoot (4-Stroke) (323 cc) with Serial Numbers 0G590000 and Above.
1998-1999Caesar 3 guide. Manual Covers: 98-99 Mercury 135HP (135 HP) & 150HP (150 HP) DFI (Direct Fuel Injection) outboard engine. V-6 Cylinder, Two Cycle, Direct Injected. Models covered are 135 & 150 OPTIMAX DIRECT FUEL INJECTION With Serial Numbers OG590000 and Above.
1999-2002 Manual Covers: Mercury Outboard 30HP, 40HP (4-Stroke) - Non-Bigfoot & Bigfoot Engine-Motor (Four-Stroke) starting with serial number 0G760300 and above.
1999-2000 Manual Covers: 99-00 Mercury 4 HP - 5 HP & 6 HP Four Stroke Engines.
Mercury 850 Outboard Manual
Mercury 850 Outboard Specs
2000-2001Manual Covers: 2000 & 2001 Mercury 75hp (75 hp) 90hp (90 hp) 4-Stroke (Four-Stroke-FourStroke) Outboard boat motor. Starting model year 2000 & starting Serial Number 0G960500 and above.
2000-2001 Manual Covers: Mercury OptiMax Outboard motors 2000-2001 115hp (115 hp) 135hp (135 hp) 150hp (150 hp) 175hp (175 hp) DFI (Direct Fuel Injection) outboard motor. Starting Model Year 2000 & Starting Serial Number OG960500 & above.
2001 Manual Covers 2001 (01) Mercury-Mariner models 50 HP (50HP) & 60 HP (60HP) 4-Stroke (Four Stroke) Outboard Engines With Serial Numbers 0T178500 and Above. Covers Bigfoot (Big Foot) and Non-Bigfoot models.
2001-2002 Manual Covers: Mercury 115 HP, Mercury 115 HP (115HP) EFI (Electronic Fuel Injection) outboard engine. 4 Cylinder InLine, 4 Stroke DOHC, 16 Valves. Starting Serial Number 0T178500.