This guy is pretty interesting. In this video he tries to build a 3.5cc motorbike. He has a lot of other videos on building small, high HP engines.
That one's rated at 0.5hp. Not sure what nitro engine the motorbike has in it but an XTR X5 3.5cc nitro engine (as an example) makes 2.7hp.You may as well get a decent 3.5cc engine
That one's 0.5hp as well. Unfortunately a NA 4 stroke nitro engine won't come close to the 2 stroke nitros for hp.How about a 2 cylinder 3.5cc engine $700
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