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What is the equivalent horse power for 420cc?

The formula to calculate horsepower from engine displacement in cubic centimeters (cc) is:

```

Horsepower = (Displacement in cc / 1500) * Efficiency

```

Assuming a typical engine efficiency of 25%, we can calculate the horsepower for a 420cc engine:

```

Horsepower = (420 / 1500) * 0.25 = 0.07 * 0.25 = 0.0175

```

Therefore, the equivalent horsepower for a 420cc engine is approximately 0.0175 horsepower.