fits model: St. make: Mercury. year: 1997–2020.

( Manufacturer Part Number: 1666-8833A27 ), ( Part Type: Hp Unit ), ( Stroke: 4-stroke ), ( Engine Hp : 9.9 )
The 1666-8833a28 1997 Mercury 9.9 HP 20 unit gearcase is a powerful and durable marine propulsion system designed for small to medium-sized boats. This gearcase is specifically compatible with the 1997 Mercury 9.9 HP outboard engine, providing a robust and efficient power solution for your watercraft.
The 20 unit gearcase features a 1.75:1 gear ratio, which provides excellent acceleration and top-end speed. It is made from high-quality materials, including a cast aluminum housing, which is both lightweight and strong. The gearcase also features a two-blade, stainless steel propeller, which is designed to provide excellent thrust and efficiency.
The 1666-8833a28 gearcase is equipped with Mercury's Advanced Mid-Height (AMH) lower unit, which provides excellent maneuverability and control. The AMH lower unit features a compact design, which helps to reduce drag and improve fuel efficiency. It also features a built-in shift and reverse mechanism, which makes shifting gears easy and smooth.
The 1666-8833a27 and 1666-8833t27 are alternative part numbers for this gearcase. The 1666-8833t27 is a trolling version of the gearcase, which features a lower gear ratio of 1.5:1. This trolling gearcase is designed to provide slow, steady speed for fishing, and features a cable shift system for easy and precise control.
In summary, the 1666-8833a28 1997 Mercury 9.9 HP 20 unit gearcase is a robust and efficient marine propulsion system that is designed to provide excellent performance and reliability. It is compatible with the 1997 Mercury 9.9 HP outboard engine and features a cast aluminum housing, a two-blade stainless steel propeller, and Mercury's Advanced Mid-Height lower unit. The alternative part numbers, 1666-8833a27 and 1666-8833t27, provide options for those looking for a trolling version of the gearcase with a lower gear ratio.
Pros of buying a 1666-8833a28 1997 Mercury 9.9 HP 20 unit gearcase:1. Reliability: Mercury is a well-known and trusted brand in the marine industry, and this gearcase is likely to be durable and reliable.
2. Power: With a 9.9 HP engine, this gearcase should provide plenty of power for most small to medium-sized boats.
3. Versatility: The 20 unit gearcase is suitable for a wide range of boats, from larger pontoons to smaller runabouts.
4. Affordability: Compared to newer models, this gearcase may be more affordable, making it a good option for budget-conscious boaters.
Cons of buying a 1666-8833a28 1997 Mercury 9.9 HP 20 unit gearcase:1. Age: Being a 1997 model, this gearcase may have some wear and tear, and may require more maintenance than a newer model.
2. Obsolete Parts: It may be harder to find replacement parts for an older model, which could lead to higher repair costs in the long run.
3. Lower Performance: Compared to newer models, this gearcase may not have the same level of performance, such as faster acceleration or more efficient use of fuel.
Conclusion:The 1666-8833a28 1997 Mercury 9.9 HP 20 unit gearcase is a reliable and powerful option for budget-conscious boaters. However, its age and potential for obsolete parts may make it less desirable for those who prioritize performance or ease of maintenance. Ultimately, the decision to purchase this gearcase should depend on your specific needs and priorities as a boat owner.
Recommendation:If you are looking for a budget-friendly option with plenty of power, the 1666-8833a28 1997 Mercury 9.9 HP 20 unit gearcase could be a good choice. However, it is recommended to have a professional inspection of the gearcase before making a purchase to ensure it is in good working order and to get a better idea of any potential maintenance or repair costs. Additionally, consider researching the availability and cost of replacement parts for this model to ensure it will be a long-term investment.
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