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![Question. Is the general rule is 15cc per 1hp, 420cc=28hp. So why is this 420cc engine 13hp? I assume it has to do with displacement or something. But 15hp (half) difference seems Question. Is the general rule is 15cc per 1hp, 420cc=28hp. So why is this 420cc engine 13hp? I assume it has to do with displacement or something. But 15hp (half) difference seems](https://preview.redd.it/question-is-the-general-rule-is-15cc-per-1hp-420cc-28hp-so-v0-n4ue4nrb1in81.jpg?auto=webp&s=b5346ed6c5fe6326d1d8a8616dbacf33a407400e)
Question. Is the general rule is 15cc per 1hp, 420cc=28hp. So why is this 420cc engine 13hp? I assume it has to do with displacement or something. But 15hp (half) difference seems
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Amazon.com : BILT HARD 420cc 15HP Gas Engine with Electric Start, Horizontal Shaft 4 Stroke OHV Gas Motor, Gas Powered Multi-Use Engine : Patio, Lawn & Garden
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