SEALY ENTERPRISE Ltd. for all your power boating needs - Mercury Outboards - Mercruiser Sterndrives - 'Shallow Water' Jet Drive Outboard motors - Marine Accessories & Supplies. Call us or drop in -7320 Route 11, Bathurst NB, 506-546-3977, ask for Keith Sealy
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Products & Services

Over the last 36 years Sealy Marine has offered only the very best service and a product line that we believe represents the best that money can buy, but at an affordable price! Our primary marine product for the last 36 years has been Mercury and we can supply most models of outboards and Mercruiser Stern Drive engines as well as service for all Mercury models we sell. Everything from reliable, instant starts and clean, quiet operation to flawless performance under almost any condition makes Mercury engines a perfect fit for your boat. We also provide quality service and sell most parts for any other popular brand of outboard and sterndrive. We also stock fibreglass and most other items needed to get boats ready for spring as well as topside paint and antifouling paint for the bottom anodes - most items needed to get both pleasure and commercial boats ready for the water.

Recently, we have seen an increase in interest from the sport fishing community so here is a sampling of some of our smaller recommended outboard motors, ideal for the lake or river angler who needs performance and reliability.

Click on any motor for specifications...

2018 Mercury 9.9hp

2018 Mercury 20hp

2018 Mercury 30hp

2018 Mercury 25hp 'Jet'

Service & Parts

We have a comprehensive inventory of commonly requested outboard engine parts, including corrosion protection items, fuel filters, fuel line assemblies, tanks, fittings and components, starters, solenoids & starter relays, starter cords, trim, tilt & hydraulics items, propellers and hub kits, oils, lubricants, additives, filters, paints and a lot more... If we do not normally stock an item, we can get it, quickly and with over 30 years helping customers, you can be assured that you will receive prompt and satisfactory service from our qualified staff.

Outboard Frequently Asked Questions


What are the benefits of four-strokes over two-strokes?

Four-strokes have inherently cleaner running qualities over traditional two-strokes. They tend to have smooth and quiet operation, improved fuel efficiency, and don't smoke. These attributes provide consistent starting, better idle and trolling performance – and they reduce fuel consumption.

What is the advantage of EFI vs. carburetors?

Electronic Fuel Injection (EFI) technology provides precise metering of fuel to each cylinder, taking into account engine and ambient temperatures, atmospheric pressure, throttle position and boat load. The benefits include turn-key starting and smooth, trouble-free operation regardless of boating conditions.

What is "Battery-Free EFI" and why is this important?

Most EFI systems require a battery to operate correctly because the engine control unit (ECU) requires initial electric current for proper startup. During startup, the ECU "reads" ambient conditions and pressurizes the fuel system before the engine begins cranking. With battery-free EFI, the initial engine rotation charges the EFI electrical and fuel systems with a dedicated and separate electrical system under the flywheel. This eliminates the need for the battery. A second pull of the starter rope allows the system to start as if there was a battery connected.

This also allows the customer to realize the benefits of EFI on manual-start outboards. Often, customers purchasing manual-start outboards don’t want the added cost and weight of an electric-start system that includes a battery, but they do want the running quality that EFI delivers.

Why does my outboard have a recoil starter even though it is electric start?

There may be cases where the starting battery is drained from running a fish finder or electric trolling motor. When it’s time to start the main engine and go home, the electric starter may not turn the outboard over. If this happens, the outboard can be manually started by pulling on the manual recoil start handle. Most competitors require that you remove the cowl, flywheel cover and other parts of the outboard to gain access to the top of the flywheel to wrap the rope. With a Mercury FourStroke outboard, you just reach back and pull the rope.

I just bought a new four-stroke outboard to replace my old two-stroke. What should I know to properly service this new four-stroke?

The main items to service include checking and changing engine oil and proper lubrication as recommended by the Owner’s Manual.

What is a "ProKicker" and how does it compare to a standard model?

The 9.9 and 15 ProKicker (needs link) FourStrokes are outboards designed specifically as auxiliary trolling motors (often referred to as "kicker" motors). These unique outboards feature standard power tilt, high-thrust four-blade propellers, automatic self-centering straps (optional on remote-steer models) and unique decals designed to complement the main engine.

The 9.9 ProKicker also features a BigFoot gearcase which includes stronger gears, bearings and shafts as well as a low 2.42:1 gear ratio for improved low-speed handling and best-in-class slow trolling speeds.

What is the difference between "Power Tilt" and "Power Trim & Tilt"?

"Power Tilt" is designed to tilt the motor in and out of the water, or to a predetermined position prior to planing the boat. Although the power tilt system will hold the motor position at any engine RPM, it will generally not be able to tilt the outboard at engine speeds above 2000 RPM.

"Power Trim" is designed to trim the outboard at planing speeds for best optimum performance in addition to tilting the outboard in and out of the water. Power trim is available on outboards 25 horsepower and higher, as these applications are the most likely to benefit from this feature.

My outboard does not operate in the maximum RPM range shown in my Owner’s Manual. What should I do?

Mercury FourStroke outboards 20 horsepower and below come standard with a propeller that should meet the needs of most applications. However, there may be situations in which this standard propeller does not provide the best performance. In such cases, the propeller may need to be changed to a higher- or lower-pitch propeller. Generally speaking, a higher-pitch propeller will lower the maximum RPM that the engine will run at during full throttle, at the expense of a slightly higher top speed, while a lower-pitch propeller has the opposite affect (higher maximum RPM, but slower speed).

Above 25 horsepower, the variety of boats is much greater and therefore, the propeller must be purchased separately to match the boat’s needs. You should consult us to ensure you have the best propeller for your boat.

What is "shallow water drive" and how do I use this?

Shallow water drive is a preset position for operating the outboard in very shallow water. This position allows some forward thrust for navigating and steering while off-plane in areas where the outboard would normally hit the bottom.

My outboard has a decal on the side that says, "This Side Up". What happens if I lay the outboard on the wrong side by accident?

The "This Side Up" decal should be facing up when the outboard is laid on its side. This position will minimize damage to the outboard and ensure that fluids do not leak out of the venting systems. In most cases, the outboard will not incur permanent damage if it is accidentally laid on the wrong side for short periods of time.

I would like to transport my 8 horsepower FourStroke in my trunk, but the tiller arm is too long and won’t fit. Is there anyway to make the tiller arm shorter?

The tiller arm cannot be made shorter. However, it can be tilted down to reduce the overall height of the outboard for storage or transportation. This is accomplished by rotating the tiller lock at the tiller arm pivot and rotating the tiller arm down at the same time.

How do the "centering straps" on my 15 ProKicker outboard work?

Centering straps are available for use on power tilt versions of the 9.9, 15 and 20 horsepower FourStrokes and help stabilize the outboard during rough water operation. They are designed to allow unimpeded steering when the outboard is in its normal running attitude. As the outboard is tilted up, the straps will automatically straighten the outboard until it reaches full tilt, at which time both straps will become tight.

These straps serve two purposes. First, they keep the outboard in the straight-ahead position so that the mount system is operating in the direction for which it was designed; namely straight ahead. Also, because the straps are tight at the full-tilt position, they help dampen the bounce/shock as the boat goes through rough water. Both of these features provide a more robust system for improved durability.

The Mercury 9.9 FourStroke does not have a trim pin like the other brands have. Do I need to buy one?

No. The 8 and 9.9 horsepower FourStrokes feature an integrated automatic ratcheting trim system that does not require a separate trim pin. Just tilt the outboard to the desired position and that’s it. When you want to return to the down position, just ratchet the outboard all the way up and allow it to return to the down position once again.

My 9.9 FourStroke has three positions marked on the transom bracket, but my owner’s manual says that I have six trim positions. Which is correct?

The Mercury 8 and 9.9 FourStroke outboards with manual trim have six trim positions that allow the user to select the best position simply by pushing down on the tiller or lifting the rear of the outboard up.

The three positions marked on the side of the clamp bracket indicate the "preset tuck" position. By setting this feature in either 1, 2 or 3, the outboard can be set to return to this same position every time. For example, if your boat operates best in the second trim position, then set the "preset tuck" to 2, and the outboard will go to this position every time it is cycled through the trim positions. You do not need to remember to reposition the trim to 2 after tilting down.

Why did Mercury integrate the cylinder head and block on the 3.5 FourStroke?

By integrating the cylinder head into the cylinder block on the 2.5 and 3.5 FourStrokes, it was possible to eliminate several fasteners and gaskets without compromising strength or durability. This unique design also allows for a more compact, lower-weight powerhead.

Why does Mercury recommend 10W30 engine oil on small outboards and 25W40 on larger outboards?

In fact, Mercury recommends 25W40 in all cases except the small outboards at low temperatures. At lower temperatures, oil tends to become thicker, resulting in more friction. On manual-start models, this additional friction can have an affect on the pull force required for starting the outboard. The 10W30 oil has less friction at cold temperatures and therefore results in a lower pull force for easier starting.

I want to transport my FourStroke outboard in my truck after fishing. What is the recommended way to do this?

First, before removing the engine from the water, run the outboard out of fuel by disconnecting the fuel hose and letting the outboard run until it stops. Then, carefully remove the outboard from the boat and carefully lay it on its side, taking note of the position of the "This Side Up" decal on the side of the cowling. On tiller models 8 horsepower and above, it is possible to rotate the tiller handle down for additional space.

MerCruiser Frequently Asked Questions


Is it better to change my engine oil/gear lube at the beginning or end of the season?

It is better to change the oil and gear lube at the end of the season, prior to storage. Lubricants naturally accumulate moisture, combustion by-products, and other contaminants during use. It can be detrimental to store an engine or drive with large amounts of these contaminants present.

How often should maintenance be performed?

Maintenance intervals vary depending on the specific engine and drive model. Recommended maintenance intervals are included in your owner's manual or service manual.

How often should I change my sacrificial anodes?

Because they are self-sacrificing, the anodes must be inspected often and replaced when 50% consumed.

Should I use Premium Blend or High Performance gear lube in my sterndrive?

High Performance gear lube is required in all Bravo and Alpha I Generation II sterndrives. It is recommended for use in all older sterndrives as well. Premium Blend and High Performance gear lube should never be mixed. Be sure to drain the unit completely if switching from one type of lube to the other.

Can I use Split-Fire spark plugs?

Mercury has not tested and cannot approve the use of split fire spark plugs. Incorrect spark plugs can foul, cause radio frequency interference, cause the engine to run poorly, and may cause severe engine damage from detonation. Your warranty does not cover damage caused by the use of products not recommended by MerCruiser. The operation and maintenance manuals list the recommended spark plug for your engine. Authorized dealers have cross-reference charts for tested and approved alternatives.

My owner's manual lists the oil capacity for my engine, but when I change the oil it won't take that much without being overfilled. Why?

The engine oil capacities given in the owner's and service manuals are approximate and indicate what the capacity of the entire lubrication system is. A small amount of oil remains in the crankcase, oil lines, etc. This is why it is difficult to get the indicated amount of oil in the engine without it being overfilled. You should always fill the crankcase according to the dipstick when the engine is level, preferably with the boat at rest in the water. If the oil is at the full mark on the dipstick, then it is at the proper level regardless of how much you put in. It is important not to overfill or under fill the crankcase. The engine oil level should always be between the add and the full marks on the dipstick.

How often should I flush my engine in saltwater use?

For maximum corrosion protection, we recommend that the engine be flushed with freshwater after each saltwater use.

Do you have a freshwater flush kit to flush the engine while in the water?

No, we do not offer a kit that can be used with the engine in the water. Currently we offer a flush kit for all sterndrive (except Bravo One Performance and Blackhawk) and inboard (V6 & small-block V8 only) engine applications. This flush kit is intended for use out of the water only. Contact us for details on the kit and additional components that will best suit your needs.

Why do I have to periodically check my engine alignment and lubricate the engine coupler?

With time and usage, the engine will sometimes get out of alignment with the transom assembly and sterndrive. For longest engine coupler life, it is important that the engine alignment be as accurate as possible. We recommend using Quicksilver Engine Coupler Spline Grease for proper lubrication. Damage caused by improper engine alignment or lack of lubrication is not covered under the limited warranty.

Do you have any tips for do-it-yourself maintenance?

If you are a person who likes to do-it-yourself, here are some suggestions for you:

What kind of spare parts should I carry on my boat for my MerCruiser?

Some suggested items would include a floating prop wrench, a spare prop and attaching hardware, spark plugs, belt(s), oil, power trim and steering fluid, High Performance gear lube, water separating fuel filter.

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