* Engine type: A 300cc single-cylinder engine will produce significantly less horsepower than a 300cc twin-cylinder or even more sophisticated designs.
* Design and technology: Modern engines with advanced fuel injection and other technologies will generally produce more horsepower than older carbureted designs.
* Tuning: An engine can be tuned for different priorities (e.g., high horsepower or high torque). A race-tuned engine will have significantly more horsepower than a stock engine.
* Application: Engines designed for motorcycles will likely have different horsepower outputs than those designed for ATVs, lawnmowers, or other applications.
You might see a range from around 15-40 horsepower, or even more in some highly tuned applications, in a 300cc engine. To find the horsepower of a *specific* 300cc motor, you'll need to consult its specifications.