Choosing between an 18hp outboard and a 5.5hp outboard is not just a horsepower question. It changes how you fuel the engine, how far you can go, and how much you spend up front. One is built for serious fishing water; the other is meant for small skiffs and short trips. Both are outboard marine engines, but they point to very different boating styles.
Quick Verdict
If you need real thrust for a fishing boat and you are comfortable mixing two-stroke oil, the HANGKAI 18hp is the stronger engine. If you want a simple, low-cost outboard for a small tender or short calm-water trips, the 5.5 HP 4-Stroke is the practical pick. The HANGKAI is listed at USD 1,098.80 and the 5.5 HP at USD 265.35, a gap of $833.45.
At a Glance
| Feature | HANGKAI 18hp 2-Stroke | 5.5 HP 4-Stroke |
| Engine | 246cc, 2-cylinder, 2-stroke | 52cc, 4-stroke |
| Max output | 13.2kW (18HP) | 1.82kW (5.5HP) |
| Cooling | Water-cooled | Air-cooled |
| Fuel tank | 24L / 6.34gal | 0.7L / 0.18gal |
| Control | Tiller control | Handle-operated |
| Price | USD 1,098.80 | USD 265.35 |
Where Each Product Wins
If you need more push for a fishing boat and want the range to keep going, the HANGKAI 18hp is the stronger choice. If your outings are short and your boat is small, the 5.5 HP 4-Stroke is the more sensible fit.
Product Notes
HANGKAI 18hp 2-Stroke Outboard
The HANGKAI 18hp is the serious-water engine. Its 246cc two-cylinder two-stroke produces up to 13.2kW (18HP), and the water-cooling system gives it a different character than the air-cooled 5.5 HP. You also get a 24L/6.34gal fuel tank, a 50:1 mixed-oil setup, and a tiller control with F-N-R gears. The 20cm/8in propeller diameter and adaptive transom plate height up to 44cm/17.32in make it a more substantial partner for a fishing boat. If you want sustained power for longer trips, this is the engine. The trade-off is the mixed-fuel routine: every fill-up starts with blending two-stroke oil into the gasoline, and the noise spec of about 80dB is worth knowing for quieter waters.
5.5 HP 4-Stroke Outboard
The 5.5 HP is built around simplicity. Its 52cc four-stroke engine makes 1.82kW (5.5HP), and the air-cooling design keeps things straightforward. The small 0.7L/0.18gal fuel tank is the defining trade-off: a filled tank runs for 40 to 70 minutes, so this is not the motor for a long crossing. For a small boat up to 8.2 feet, a handle-operated outboard like this is easy to control and much lighter on the wallet. If you are making short trips, fitting a small skiff, or want a low-cost way to get on the water, the 5.5 HP does the job without the fuel appetite of the 18hp.
Final Choice by Use Case
Fishing trips on open water: The HANGKAI 18hp. It has the power and controls for longer days without letting up. Short trips on a small boat: The 5.5 HP 4-Stroke. It is a simple, low-cost companion for a skiff up to 8.2 feet. Budget-minded first outboard: The 5.5 HP 4-Stroke. The lower price gets you a 4-stroke engine without a big upfront commitment. Longer trips without frequent refueling: The HANGKAI 18hp. It is built to keep working when you want to stay out on the water.
