ORIGINAL: GaGeeBees
The OS Pegasus is the way to go. Beautiful engine, great sound, plenty of power. Anything else pales by comparison. Nothing against two stroke gas burners but I just don't think that a Cub should sound like a weed-whacker
The pegasus is nice, no question, but it's a 1/4 scale engine....looks too small in the 1/3 scale cub. I've got the Kavan FK50 for mine - 1/3 scale engine, but only 2 cyl. Can't win 'em all.