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It's 1 hp to every 25cc on carbs and 1 hp to 22 on efi give or take a little bet

Answer:

Horsepower and cubic centimeters or inches have no correlation whatsoever to horsepower ratings, Lets look at some examples;

1. A 750 c.c motorcycle engine produces well north of 100 hp, a 740 c.c. Briggs or Kohler produces around 25 hp

2. A 125 c.c Motocross bike produces around 27 hp vs. a 160 c.c lawnmower engine produces around 5 hp.

3. a 3500 c.c. Formula One engine produces 1,000 hp vs 3800 c.c GM v-6 produces 205 hp.

4. an old cast iron 850 c.c Kohler K-series (K-532 twin) produces 20 hp vs an 800 c.c snowmobile produces upwards of 140 hp.

These are a few examples to show that cubic centimeters has no relation to horsepower. However, if you had mentioned what 420 c,c. engine you were referring to in your question I could have provided you with an answer for that particular engine.

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