DeckCurrent

21' Supra Mariah Boat vs 3.5HP Outboard Motor: Choose the Right One for the Water

Need a full tow boat or a compact tender motor? This head-to-head compares the 21' 1990 Supra Mariah Boat and the 3.5HP gas outboard on price, size, and best use.

Last updated Aug 17, 2026

When you're shopping in boats and personal watercraft, the first decision is scale, not style. One option is a complete ski boat, and the other is a compact outboard for small craft. They both get you out on the water, but they solve different problems.

Quick Verdict

If your priority is a ready-to-launch tow boat for lake skiing and family outings, the Supra Mariah is the clear choice. If you need a lightweight motor for a tender, the compact outboard is the practical pick.

Side-by-Side Comparison

ProductListed PricePrice BarBest For
21' 1990 Supra Mariah BoatUSD 8,000.00Full ski boat duty: towing, boarding, lake cruising
3.5HP 2 Stroke Gas Outboard MotorUSD 197.76Dinghies and small fishing boats needing portable power

Where Each Product Wins

The Supra Mariah wins when you want the whole package rather than just propulsion. It's a one-owner boat stored indoors, with all stainless hardware, new gel and rubber rail, good upholstery and carpet, a 351 PCM Cleveland Block with 785 hours, and a Trail Master trailer with new tires.

The outboard wins when you already have the hull and need a new motor. It has CDI ignition, a 35:1 fuel-to-oil ratio, and a package that includes a water pump impeller, starter, funnel, and fuel mixing bottle.

Product Notes

21' 1990 Supra Mariah Boat

21' 1990 Supra Mariah Boat

This is a full fresh-water ski boat package. It is a one-owner boat that has been stored indoors, with stainless hardware, new gel, a new rubber rail, and upholstery and carpet in good condition. Under the hatch sits a 351 PCM Cleveland Block with 785 hours, and the boat has had a dealer inspection. The Trail Master trailer has new tires, so the price of USD 8,000.00 covers hull, engine, and trailer. It's a lot of boat for the money, but it's also a 1990 model in used condition. That means you should expect some age-related upkeep, especially with an inboard engine that has nearly 800 hours on it.

3.5HP 2 Stroke Gas Outboard Motor Manual Start For Dinghy Small Fishing Boat

3.5HP 2 Stroke Gas Outboard Motor Manual Start For Dinghy Small Fishing Boat

This is a new outboard motor designed for someone who already owns a small craft. It delivers 3.5 HP from a 2-stroke gas engine with manual start, CDI ignition, and a 2.5kW maximum output. At USD 197.76, it's a way to add propulsion without buying a full boat. The package includes the motor, water pump impeller, starter, funnel, fuel mixing bottle, and instructions, and the aluminum alloy construction is highlighted for hardness, anti-corrosion, and anti-rust performance. The trade-off is size: this motor is meant for small watercraft, not for pulling skiers or moving a 21' ski boat. You'll also mix gas at 35:1 and use a recoil starter on every outing.

Final Choice by Use Case

Go with the Supra Mariah Boat when you want a complete, tow-ready ski boat with room for family outings. Go with the compact outboard motor when you need a portable power source for a small boat and want to keep the purchase price low.

Products in this article
21' 1990 Supra Mariah BoatUSD 8,000.00View on eBay3.5HP 2 Stroke Gas Outboard Motor Manual StartUSD 197.76View on eBay
21' 1990 Supra Mariah BoatUSD 8,000.00View on eBay3.5HP 2 Stroke Gas Outboard Motor Manual StartUSD 197.76View on eBay

You may also like

Finding more guides for you…