Choosing between a 21-foot ski boat and a compact outboard motor may seem odd, but it's a real decision for many boaters. In the boats personal watercraft space, the answer depends on where you'll keep the boat and how you want to use it. The 21' 1990 Supra Mariah Boat is priced at $8,000, while the 3.5HP 2 Stroke Gas Outboard Motor is priced at $177.76, a gap of $7,822.24. That price gap mirrors the size and purpose difference.
Quick Verdict
If you want to pull skiers and carry a crew, the Supra Mariah is the only product here with that capability. If you need lightweight, portable power, the 3.5HP outboard is the better fit. Neither is universally better; your choice should follow your boating plan.
Price and Spec Comparison
| Feature | 21' 1990 Supra Mariah Boat | 3.5HP 2 Stroke Outboard Motor |
|---|---|---|
| Price | USD $8,000 | USD $177.76 |
| Condition | Used | New |
| Power | Inboard engine | 3.5HP outboard |
| Fuel | Gas, 11-20 gallon capacity | Gas, 35:1 fuel-to-oil mix |
| Purpose | Ski boat | Portable outboard |
Where the Supra Mariah Wins
The 21' 1990 Supra Mariah is a complete boat rather than a component. It has a composite hull and a fresh-water boat layout, with stainless hardware, new gel, a new rubber rail, and good upholstery and carpet. For a boater who wants a single purchase that puts a full boat on the water, this is the stronger choice.
Where the 3.5HP Outboard Wins
The 3.5HP 2 Stroke Gas Outboard Motor is new, manual-start, and powered by a 2-stroke engine with a CDI ignition system. Weighing about 28.66 lbs, it's easy to lift and carry, and the package includes a water pump impeller, starter, funnel, and fuel mixing bottle. For someone who already has a small craft, this motor is a practical power source.
Product Notes
21' 1990 Supra Mariah Boat
This used 21-footer is set up as a ski boat. It is a one-owner boat that was stored indoors, with stainless hardware, new gel, a new rubber rail, and upholstery and carpet in good condition. The inboard engine and composite hull make it a substantial, purpose-built boat for pulling skiers and carrying a crew, and the 11-20 gallon fuel capacity supports a day on the lake. The limitation is the age and condition: it's a 1990 model sold as used, and the inboard engine means a larger fuel and maintenance commitment than a small outboard. This is for someone ready to own and care for a classic ski boat.
3.5HP 2 Stroke Gas Outboard Motor
This new outboard motor is designed for dinghies and small fishing boats. It uses a 2-stroke engine with a CDI ignition system and a full-throttle operating range of 4000-5000 RPM, starting manually with a pull. The package includes a water pump impeller, starter, funnel, and fuel oil mixing bottle, which are useful extras for a first-time owner. The biggest advantage is portability: at about 28.66 lbs, it's light enough to carry and mount on a compact boat. The limitation is the power: 3.5hp is suitable for a small watercraft, not for towing skiers or moving a 21-foot boat, and the 2-stroke engine needs a 35:1 fuel-to-oil ratio at every fill. It fits a tender or small fishing vessel.
Final Choice by Use Case
- For a family boat that can pull skiers and carry a crew: choose the 21' 1990 Supra Mariah Boat.
- For a dinghy, inflatable, or small fishing boat: choose the 3.5HP 2 Stroke Gas Outboard Motor.
- If you want a complete lake boat in a single purchase: the Supra Mariah is the most complete option.
- If you need a portable motor you can lift on and off a small craft: the 3.5HP outboard is the better fit.
