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Is it possable to put a 5hp crank in to a 3hp briggs motor from the 1970's era? I want to get more Hp.

I got a mini outlaw bike my son and I made. We're running a 1970s era brigs 3hp. I'm thinking of trying a 5hp crank and side cover, crazy pipe dream or what? Can it be done? p.s. I'll show a pic of the bike if I can figure out how.